# times

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The `times` module contains routines and types for dealing with time using the proleptic Gregorian calendar. It's also available for the JavaScript target.

Although the `times` module supports nanosecond time resolution, the resolution used by `getTime()` depends on the platform and backend (JS is limited to millisecond precision).

# Examples

    import times, os
    # Simple benchmarking
    let time = cpuTime()
    sleep(100) # Replace this with something to be timed
    echo "Time taken: ", cpuTime() - time

    # Current date & time
    let now1 = now()     # Current timestamp as a DateTime in local time
    let now2 = now().utc # Current timestamp as a DateTime in UTC
    let now3 = getTime() # Current timestamp as a Time

    # Arithmetic using Duration
    echo "One hour from now      : ", now() + initDuration(hours = 1)
    # Arithmetic using TimeInterval
    echo "One year from now      : ", now() + 1.years
    echo "One month from now     : ", now() + 1.months

# Parsing and Formatting Dates

The `DateTime` type can be parsed and formatted using the different `parse` and `format` procedures.

    let dt = parse("2000-01-01", "yyyy-MM-dd")
    echo dt.format("yyyy-MM-dd")

The different format patterns that are supported are documented below.

Pattern | Description | Example
--- | --- | ---
`d` | Numeric value representing the day of the month, it will be either one or two digits long. | `1/04/2012 -> 1` `21/04/2012 -> 21`
`dd` | Same as above, but is always two digits. | `1/04/2012 -> 01` `21/04/2012 -> 21`
`ddd` | Three letter string which indicates the day of the week. | `Saturday -> Sat` `Monday -> Mon`
`dddd` | Full string for the day of the week. | `Saturday -> Saturday` `Monday -> Monday`
`h` | The hours in one digit if possible. Ranging from 1-12. | `5pm -> 5` `2am -> 2`
`hh` | The hours in two digits always. If the hour is one digit, 0 is prepended. | `5pm -> 05` `11am -> 11`
`H` | The hours in one digit if possible, ranging from 0-23. | `5pm -> 17` `2am -> 2`
`HH` | The hours in two digits always. 0 is prepended if the hour is one digit. | `5pm -> 17` `2am -> 02`
`m` | The minutes in one digit if possible. | `5:30 -> 30` `2:01 -> 1`
`mm` | Same as above but always two digits, 0 is prepended if the minute is one digit. | `5:30 -> 30` `2:01 -> 01`
`M` | The month in one digit if possible. | `September -> 9` `December -> 12`
`MM` | The month in two digits always. 0 is prepended if the month value is one digit. | `September -> 09` `December -> 12`
`MMM` | Abbreviated three-letter form of the month. | `September -> Sep` `December -> Dec`
`MMMM` | Full month string, properly capitalized. | `September -> September`
`s` | Seconds as one digit if possible. | `00:00:06 -> 6`
`ss` | Same as above but always two digits. 0 is prepended if the second is one digit. | `00:00:06 -> 06`
`t` | `A` when time is in the AM. `P` when time is in the PM. | `5pm -> P` `2am -> A`
`tt` | Same as above, but `AM` and `PM` instead of `A` and `P` respectively. | `5pm -> PM` `2am -> AM`
`yy` | The last two digits of the year. When parsing, the current century is assumed. | `2012 AD -> 12`
`yyyy` | The year, padded to at least four digits. Is always positive, even when the year is BC. When the year is more than four digits, '+' is prepended. | `2012 AD -> 2012` `24 AD -> 0024` `24 BC -> 00024` `12345 AD -> +12345`
`YYYY` | The year without any padding. Is always positive, even when the year is BC. | `2012 AD -> 2012` `24 AD -> 24` `24 BC -> 24` `12345 AD -> 12345`
`uuuu` | The year, padded to at least four digits. Will be negative when the year is BC. When the year is more than four digits, '+' is prepended unless the year is BC. | `2012 AD -> 2012` `24 AD -> 0024` `24 BC -> -0023` `12345 AD -> +12345`
`UUUU` | The year without any padding. Will be negative when the year is BC. | `2012 AD -> 2012` `24 AD -> 24` `24 BC -> -23` `12345 AD -> 12345`
`z` | Displays the timezone offset from UTC. | `UTC+7 -> +7` `UTC-5 -> -5`
`zz` | Same as above but with leading 0. | `UTC+7 -> +07` `UTC-5 -> -05`
`zzz` | Same as above but with `:mm` where mm represents minutes. | `UTC+7 -> +07:00` `UTC-5 -> -05:00`
`zzzz` | Same as above but with `:ss` where ss represents seconds. | `UTC+7 -> +07:00:00` `UTC-5 -> -05:00:00`
`g` | Era: AD or BC | `300 AD -> AD` `300 BC -> BC`
`fff` | Milliseconds display | `1000000 nanoseconds -> 1`
`ffffff` | Microseconds display | `1000000 nanoseconds -> 1000`
`fffffffff` | Nanoseconds display | `1000000 nanoseconds -> 1000000`

Other strings can be inserted by putting them in `''`. For example `hh'->'mm` will give `01->56`. The following characters can be inserted without quoting them: `:` `-` `(` `)` `/` `[` `]` `,`. A literal `'` can be specified with `''`.

However you don't need to necessarily separate format patterns, as an unambiguous format string like `yyyyMMddhhmmss` is also valid (although only for years in the range 1..9999).

# Duration vs TimeInterval

The `times` module exports two similar types that are both used to represent some amount of time: Duration and TimeInterval. This section explains how they differ and when one should be preferred over the other (short answer: use `Duration` unless support for months and years is needed).

## Duration

A `Duration` represents a duration of time stored as seconds and nanoseconds. A `Duration` is always fully normalized, so `initDuration(hours = 1)` and `initDuration(minutes = 60)` are equivalent.

Arithmetic with a `Duration` is very fast, especially when used with the `Time` type, since it only involves basic arithmetic. Because `Duration` is more performant and easier to understand it should generally preferred.

## TimeInterval

A `TimeInterval` represents an amount of time expressed in calendar units, for example "1 year and 2 days". Since some units cannot be normalized (the length of a year is different for leap years for example), the `TimeInterval` type uses separate fields for every unit. The `TimeInterval`'s returned from this module generally don't normalize anything, so even units that could be normalized (like seconds, milliseconds and so on) are left untouched.

Arithmetic with a `TimeInterval` can be very slow, because it requires timezone information.

Since it's slower and more complex, the `TimeInterval` type should be avoided unless the program explicitly needs the features it offers that `Duration` doesn't have.

## How long is a day?

It should be especially noted that the handling of days differs between `TimeInterval` and `Duration`. The `Duration` type always treats a day as exactly 86400 seconds. For `TimeInterval`, it's more complex.

As an example, consider the amount of time between these two timestamps, both in the same timezone:

> - 2018-03-25T12:00+02:00
> - 2018-03-26T12:00+01:00

If only the date & time is considered, it appears that exactly one day has passed. However, the UTC offsets are different, which means that the UTC offset was changed somewhere in between. This happens twice each year for timezones that use daylight savings time. Because of this change, the amount of time that has passed is actually 25 hours.

The `TimeInterval` type uses calendar units, and will say that exactly one day has passed. The `Duration` type on the other hand normalizes everything to seconds, and will therefore say that 90000 seconds has passed, which is the same as 25 hours.

# See also

- monotimes module

# Imports

strutils, math, options, since, posix

# Types

    Month = enum
      mJan = (1, "January"), mFeb = "February", mMar = "March", mApr = "April",
      mMay = "May", mJun = "June", mJul = "July", mAug = "August",
      mSep = "September", mOct = "October", mNov = "November", mDec = "December"

  Represents a month. Note that the enum starts at `1`, so `ord(month)` will give the month number in the range `1..12`. Source Edit

    WeekDay = enum
      dMon = "Monday", dTue = "Tuesday", dWed = "Wednesday", dThu = "Thursday",
      dFri = "Friday", dSat = "Saturday", dSun = "Sunday"

  Represents a weekday. Source Edit

    MonthdayRange = range[1 .. 31]

  Source Edit

    HourRange = range[0 .. 23]

  Source Edit

    MinuteRange = range[0 .. 59]

  Source Edit

    SecondRange = range[0 .. 60]

  Includes the value 60 to allow for a leap second. Note however that the `second` of a `DateTime` will never be a leap second. Source Edit

    YeardayRange = range[0 .. 365]

  Source Edit

    NanosecondRange = range[0 .. 999999999]

  Source Edit

    Time = object
      seconds: int64
      nanosecond: NanosecondRange

  Represents a point in time. Source Edit

    DateTime = object of RootObj
      nanosecond: NanosecondRange
      second: SecondRange
      minute: MinuteRange
      hour: HourRange
      monthdayZero: int
      monthZero: int
      year: int
      weekday: WeekDay
      yearday: YeardayRange
      isDst: bool
      timezone: Timezone
      utcOffset: int

  Represents a time in different parts. Although this type can represent leap seconds, they are generally not supported in this module. They are not ignored, but the `DateTime`'s returned by procedures in this module will never have a leap second. Source Edit

    Duration = object
      seconds: int64
      nanosecond: NanosecondRange

  Represents a fixed duration of time, meaning a duration that has constant length independent of the context.

  To create a new `Duration`, use initDuration proc.

  Source Edit

    TimeUnit = enum
      Nanoseconds, Microseconds, Milliseconds, Seconds, Minutes, Hours, Days, Weeks,
      Months, Years

  Different units of time. Source Edit

    FixedTimeUnit = range[Nanoseconds .. Weeks]

  Subrange of `TimeUnit` that only includes units of fixed duration. These are the units that can be represented by a `Duration`. Source Edit

    TimeInterval = object
      nanoseconds*: int          ## The number of nanoseconds
      microseconds*: int         ## The number of microseconds
      milliseconds*: int         ## The number of milliseconds
      seconds*: int              ## The number of seconds
      minutes*: int              ## The number of minutes
      hours*: int                ## The number of hours
      days*: int                 ## The number of days
      weeks*: int                ## The number of weeks
      months*: int               ## The number of months
      years*: int                ## The number of years

  Represents a non-fixed duration of time. Can be used to add and subtract non-fixed time units from a DateTime or Time.

  Create a new `TimeInterval` with initTimeInterval proc.

  Note that `TimeInterval` doesn't represent a fixed duration of time, since the duration of some units depend on the context (e.g a year can be either 365 or 366 days long). The non-fixed time units are years, months, days and week.

  Note that `TimeInterval`'s returned from the `times` module are never normalized. If you want to normalize a time unit, Duration should be used instead.

  Source Edit

    Timezone = ref object
      zonedTimeFromTimeImpl: proc (x: Time): ZonedTime {...}{.tags: [], raises: [],
          gcsafe, locks: 0.}
      zonedTimeFromAdjTimeImpl: proc (x: Time): ZonedTime {...}{.tags: [], raises: [],
          gcsafe, locks: 0.}
      name: string

  Timezone interface for supporting DateTimes of arbitrary timezones. The `times` module only supplies implementations for the systems local time and UTC. Source Edit

    ZonedTime = object
      time*: Time                ## The point in time being represented.
      utcOffset*: int            ## The offset in seconds west of UTC,
                                 ## including any offset due to DST.
      isDst*: bool               ## Determines whether DST is in effect.

  Represents a point in time with an associated UTC offset and DST flag. This type is only used for implementing timezones. Source Edit

    DurationParts = array[FixedTimeUnit, int64]

  Source Edit

    TimeIntervalParts = array[TimeUnit, int]

  Source Edit

    DateTimeLocale = object
      MMM*: array[mJan .. mDec, string]
      MMMM*: array[mJan .. mDec, string]
      ddd*: array[dMon .. dSun, string]
      dddd*: array[dMon .. dSun, string]

  Source Edit

    TimeFormat = object
      patterns: seq[byte] ## \
                          ## Contains the patterns encoded as bytes.
                          ## Literal values are encoded in a special way.
                          ## They start with ``Lit.byte``, then the length of the literal, then the
                          ## raw char values of the literal. For example, the literal `foo` would
                          ## be encoded as ``@[Lit.byte, 3.byte, 'f'.byte, 'o'.byte, 'o'.byte]``.
      formatStr: string

  Represents a format for parsing and printing time types.

  To create a new `TimeFormat` use initTimeFormat proc.

  Source Edit

    TimeParseError = object of ValueError

  Raised when parsing input using a `TimeFormat` fails. Source Edit

    TimeFormatParseError = object of ValueError

  Raised when parsing a `TimeFormat` string fails. Source Edit

# Consts

    DurationZero = (seconds: 0, nanosecond: 0)

  Zero value for durations. Useful for comparisons.

      doAssert initDuration(seconds = 1) > DurationZero
      doAssert initDuration(seconds = 0) == DurationZero

  Source Edit

    DefaultLocale = (MMM: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
                           "Sep", "Oct", "Nov", "Dec"], MMMM: ["January",
        "February", "March", "April", "May", "June", "July", "August", "September",
        "October", "November", "December"],
                     ddd: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"], dddd: [
        "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"])

  Source Edit

# Procs

    proc convert[T: SomeInteger](unitFrom, unitTo: FixedTimeUnit; quantity: T): T {...}{.
        inline.}

  Convert a quantity of some duration unit to another duration unit. This proc only deals with integers, so the result might be truncated.

  Example:

      doAssert convert(Days, Hours, 2) == 48
      doAssert convert(Days, Weeks, 13) == 1 # Truncated
      doAssert convert(Seconds, Milliseconds, -1) == -1000

  Source Edit

    proc isLeapYear(year: int): bool {...}{.raises: [], tags: [].}

  Returns true if `year` is a leap year.

  Example:

      doAssert isLeapYear(2000)
      doAssert not isLeapYear(1900)

  Source Edit

    proc getDaysInMonth(month: Month; year: int): int {...}{.raises: [], tags: [].}

  Get the number of days in `month` of `year`.

  Example:

      doAssert getDaysInMonth(mFeb, 2000) == 29
      doAssert getDaysInMonth(mFeb, 2001) == 28

  Source Edit

    proc getDayOfYear(monthday: MonthdayRange; month: Month; year: int): YeardayRange {...}{.
        tags: [], raises: [], gcsafe, locks: 0.}

  Returns the day of the year. Equivalent with `initDateTime(monthday, month, year, 0, 0, 0).yearday`.

  Example:

      doAssert getDayOfYear(1, mJan, 2000) == 0
      doAssert getDayOfYear(10, mJan, 2000) == 9
      doAssert getDayOfYear(10, mFeb, 2000) == 40

  Source Edit

    proc getDayOfWeek(monthday: MonthdayRange; month: Month; year: int): WeekDay {...}{.
        tags: [], raises: [], gcsafe, locks: 0.}

  Returns the day of the week enum from day, month and year. Equivalent with `initDateTime(monthday, month, year, 0, 0, 0).weekday`.

  Example:

      doAssert getDayOfWeek(13, mJun, 1990) == dWed
      doAssert $getDayOfWeek(13, mJun, 1990) == "Wednesday"

  Source Edit

    proc getDaysInYear(year: int): int {...}{.raises: [], tags: [].}

  Get the number of days in a `year`

  Example:

      doAssert getDaysInYear(2000) == 366
      doAssert getDaysInYear(2001) == 365

  Source Edit

    proc initDuration(nanoseconds, microseconds, milliseconds, seconds, minutes,
                      hours, days, weeks: int64 = 0): Duration {...}{.raises: [],
        tags: [].}

  Create a new Duration.

  Example:

      let dur = initDuration(seconds = 1, milliseconds = 1)
      doAssert dur.inMilliseconds == 1001
      doAssert dur.inSeconds == 1

  Source Edit

    proc inWeeks(dur: Duration): int64 {...}{.raises: [], tags: [].}

  Convert the duration to the number of whole weeks.

  Example:

      let dur = initDuration(days = 8)
      doAssert dur.inWeeks == 1

  Source Edit

    proc inDays(dur: Duration): int64 {...}{.raises: [], tags: [].}

  Convert the duration to the number of whole days.

  Example:

      let dur = initDuration(hours = -50)
      doAssert dur.inDays == -2

  Source Edit

    proc inHours(dur: Duration): int64 {...}{.raises: [], tags: [].}

  Convert the duration to the number of whole hours.

  Example:

      let dur = initDuration(minutes = 60, days = 2)
      doAssert dur.inHours == 49

  Source Edit

    proc inMinutes(dur: Duration): int64 {...}{.raises: [], tags: [].}

  Convert the duration to the number of whole minutes.

  Example:

      let dur = initDuration(hours = 2, seconds = 10)
      doAssert dur.inMinutes == 120

  Source Edit

    proc inSeconds(dur: Duration): int64 {...}{.raises: [], tags: [].}

  Convert the duration to the number of whole seconds.

  Example:

      let dur = initDuration(hours = 2, milliseconds = 10)
      doAssert dur.inSeconds == 2 * 60 * 60

  Source Edit

    proc inMilliseconds(dur: Duration): int64 {...}{.raises: [], tags: [].}

  Convert the duration to the number of whole milliseconds.

  Example:

      let dur = initDuration(seconds = -2)
      doAssert dur.inMilliseconds == -2000

  Source Edit

    proc inMicroseconds(dur: Duration): int64 {...}{.raises: [], tags: [].}

  Convert the duration to the number of whole microseconds.

  Example:

      let dur = initDuration(seconds = -2)
      doAssert dur.inMicroseconds == -2000000

  Source Edit

    proc inNanoseconds(dur: Duration): int64 {...}{.raises: [], tags: [].}

  Convert the duration to the number of whole nanoseconds.

  Example:

      let dur = initDuration(seconds = -2)
      doAssert dur.inNanoseconds == -2000000000

  Source Edit

    proc toParts(dur: Duration): DurationParts {...}{.raises: [], tags: [].}

  Converts a duration into an array consisting of fixed time units.

  Each value in the array gives information about a specific unit of time, for example `result[Days]` gives a count of days.

  This procedure is useful for converting `Duration` values to strings.

  Example:

      var dp = toParts(initDuration(weeks = 2, days = 1))
      doAssert dp[Days] == 1
      doAssert dp[Weeks] == 2
      doAssert dp[Minutes] == 0
      dp = toParts(initDuration(days = -1))
      doAssert dp[Days] == -1

  Source Edit

    proc `$`(dur: Duration): string {...}{.raises: [], tags: [].}

  Human friendly string representation of a `Duration`.

  Example:

      doAssert $initDuration(seconds = 2) == "2 seconds"
      doAssert $initDuration(weeks = 1, days = 2) == "1 week and 2 days"
      doAssert $initDuration(hours = 1, minutes = 2, seconds = 3) ==
        "1 hour, 2 minutes, and 3 seconds"
      doAssert $initDuration(milliseconds = -1500) ==
        "-1 second and -500 milliseconds"

  Source Edit

    proc `+`(a, b: Duration): Duration {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                         extern: "ntAddDuration", raises: [],
                                         tags: [].}

  Add two durations together.

  Example:

      doAssert initDuration(seconds = 1) + initDuration(days = 1) ==
        initDuration(seconds = 1, days = 1)

  Source Edit

    proc `-`(a, b: Duration): Duration {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                         extern: "ntSubDuration", raises: [],
                                         tags: [].}

  Subtract a duration from another.

  Example:

      doAssert initDuration(seconds = 1, days = 1) - initDuration(seconds = 1) ==
        initDuration(days = 1)

  Source Edit

    proc `-`(a: Duration): Duration {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                      extern: "ntReverseDuration", raises: [],
                                      tags: [].}

  Reverse a duration.

  Example:

      doAssert -initDuration(seconds = 1) == initDuration(seconds = -1)

  Source Edit

    proc `<`(a, b: Duration): bool {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                     extern: "ntLtDuration", raises: [], tags: [].}

  Note that a duration can be negative, so even if `a < b` is true `a` might represent a larger absolute duration. Use `abs(a) < abs(b)` to compare the absolute duration.

  Example:

      doAssert initDuration(seconds = 1) < initDuration(seconds = 2)
      doAssert initDuration(seconds = -2) < initDuration(seconds = 1)
      doAssert initDuration(seconds = -2).abs < initDuration(seconds = 1).abs == false

  Source Edit

    proc `<=`(a, b: Duration): bool {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                      extern: "ntLeDuration", raises: [], tags: [].}

  Source Edit

    proc `==`(a, b: Duration): bool {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                      extern: "ntEqDuration", raises: [], tags: [].}

  Example:

      let
        d1 = initDuration(weeks = 1)
        d2 = initDuration(days = 7)
      doAssert d1 == d2

  Source Edit

    proc `*`(a: int64; b: Duration): Duration {...}{.gcsafe, noSideEffect, gcsafe,
        locks: 0, extern: "ntMulInt64Duration", raises: [], tags: [].}

  Multiply a duration by some scalar.

  Example:

      doAssert 5 * initDuration(seconds = 1) == initDuration(seconds = 5)
      doAssert 3 * initDuration(minutes = 45) == initDuration(hours = 2, minutes = 15)

  Source Edit

    proc `*`(a: Duration; b: int64): Duration {...}{.gcsafe, noSideEffect, gcsafe,
        locks: 0, extern: "ntMulDuration", raises: [], tags: [].}

  Multiply a duration by some scalar.

  Example:

      doAssert initDuration(seconds = 1) * 5 == initDuration(seconds = 5)
      doAssert initDuration(minutes = 45) * 3 == initDuration(hours = 2, minutes = 15)

  Source Edit

    proc `+=`(d1: var Duration; d2: Duration) {...}{.raises: [], tags: [].}

  Source Edit

    proc `-=`(dt: var Duration; ti: Duration) {...}{.raises: [], tags: [].}

  Source Edit

    proc `*=`(a: var Duration; b: int) {...}{.raises: [], tags: [].}

  Source Edit

    proc `div`(a: Duration; b: int64): Duration {...}{.gcsafe, noSideEffect, gcsafe,
        locks: 0, extern: "ntDivDuration", raises: [], tags: [].}

  Integer division for durations.

  Example:

      doAssert initDuration(seconds = 3) div 2 ==
        initDuration(milliseconds = 1500)
      doAssert initDuration(minutes = 45) div 30 ==
        initDuration(minutes = 1, seconds = 30)
      doAssert initDuration(nanoseconds = 3) div 2 ==
        initDuration(nanoseconds = 1)

  Source Edit

    proc high(typ: typedesc[Duration]): Duration

  Get the longest representable duration. Source Edit

    proc low(typ: typedesc[Duration]): Duration

  Get the longest representable duration of negative direction. Source Edit

    proc abs(a: Duration): Duration {...}{.raises: [], tags: [].}

  Example:

      doAssert initDuration(milliseconds = -1500).abs ==
        initDuration(milliseconds = 1500)

  Source Edit

    proc initTime(unix: int64; nanosecond: NanosecondRange): Time {...}{.raises: [],
        tags: [].}

  Create a Time from a unix timestamp and a nanosecond part. Source Edit

    proc nanosecond(time: Time): NanosecondRange {...}{.raises: [], tags: [].}

  Get the fractional part of a `Time` as the number of nanoseconds of the second. Source Edit

    proc fromUnix(unix: int64): Time {...}{.gcsafe, locks: 0, tags: [], raises: [],
                                       noSideEffect.}

  Convert a unix timestamp (seconds since `1970-01-01T00:00:00Z`) to a `Time`.

  Example:

      doAssert $fromUnix(0).utc == "1970-01-01T00:00:00Z"

  Source Edit

    proc toUnix(t: Time): int64 {...}{.gcsafe, locks: 0, tags: [], raises: [],
                                  noSideEffect.}

  Convert `t` to a unix timestamp (seconds since `1970-01-01T00:00:00Z`). See also `toUnixFloat` for subsecond resolution.

  Example:

      doAssert fromUnix(0).toUnix() == 0

  Source Edit

    proc fromUnixFloat(seconds: float): Time {...}{.gcsafe, locks: 0, tags: [],
        raises: [], noSideEffect.}

  Convert a unix timestamp in seconds to a `Time`; same as `fromUnix` but with subsecond resolution.

  Example:

      doAssert fromUnixFloat(123456.0) == fromUnixFloat(123456)
      doAssert fromUnixFloat(-123456.0) == fromUnixFloat(-123456)

  Source Edit

    proc toUnixFloat(t: Time): float {...}{.gcsafe, locks: 0, tags: [], raises: [].}

  Same as `toUnix` but using subsecond resolution.

  Example:

      let t = getTime()
      # `<` because of rounding errors
      doAssert abs(t.toUnixFloat().fromUnixFloat - t) < initDuration(nanoseconds = 1000)

  Source Edit

    proc fromWinTime(win: int64): Time {...}{.raises: [], tags: [].}

  Convert a Windows file time (100-nanosecond intervals since `1601-01-01T00:00:00Z`) to a `Time`. Source Edit

    proc toWinTime(t: Time): int64 {...}{.raises: [], tags: [].}

  Convert `t` to a Windows file time (100-nanosecond intervals since `1601-01-01T00:00:00Z`). Source Edit

    proc getTime(): Time {...}{.tags: [TimeEffect], gcsafe, locks: 0, raises: [].}

  Gets the current time as a `Time` with up to nanosecond resolution. Source Edit

    proc `-`(a, b: Time): Duration {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                     extern: "ntDiffTime", raises: [], tags: [].}

  Computes the duration between two points in time.

  Example:

      doAssert initTime(1000, 100) - initTime(500, 20) ==
        initDuration(minutes = 8, seconds = 20, nanoseconds = 80)

  Source Edit

    proc `+`(a: Time; b: Duration): Time {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                           extern: "ntAddTime", raises: [], tags: [].}

  Add a duration of time to a `Time`.

  Example:

      doAssert (fromUnix(0) + initDuration(seconds = 1)) == fromUnix(1)

  Source Edit

    proc `-`(a: Time; b: Duration): Time {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                           extern: "ntSubTime", raises: [], tags: [].}

  Subtracts a duration of time from a `Time`.

  Example:

      doAssert (fromUnix(0) - initDuration(seconds = 1)) == fromUnix(-1)

  Source Edit

    proc `<`(a, b: Time): bool {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                 extern: "ntLtTime", raises: [], tags: [].}

  Returns true if `a < b`, that is if `a` happened before `b`.

  Example:

      doAssert initTime(50, 0) < initTime(99, 0)

  Source Edit

    proc `<=`(a, b: Time): bool {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                  extern: "ntLeTime", raises: [], tags: [].}

  Returns true if `a <= b`. Source Edit

    proc `==`(a, b: Time): bool {...}{.gcsafe, noSideEffect, gcsafe, locks: 0,
                                  extern: "ntEqTime", raises: [], tags: [].}

  Returns true if `a == b`, that is if both times represent the same point in time. Source Edit

    proc `+=`(t: var Time; b: Duration) {...}{.raises: [], tags: [].}

  Source Edit

    proc `-=`(t: var Time; b: Duration) {...}{.raises: [], tags: [].}

  Source Edit

    proc high(typ: typedesc[Time]): Time

  Source Edit

    proc low(typ: typedesc[Time]): Time

  Source Edit

    proc nanosecond(dt: DateTime): NanosecondRange {...}{.inline, raises: [], tags: [].}

  The number of nanoseconds after the second, in the range 0 to 999_999_999. Source Edit

    proc second(dt: DateTime): SecondRange {...}{.inline, raises: [], tags: [].}

  The number of seconds after the minute, in the range 0 to 59. Source Edit

    proc minute(dt: DateTime): MinuteRange {...}{.inline, raises: [], tags: [].}

  The number of minutes after the hour, in the range 0 to 59. Source Edit

    proc hour(dt: DateTime): HourRange {...}{.inline, raises: [], tags: [].}

  The number of hours past midnight, in the range 0 to 23. Source Edit

    proc monthday(dt: DateTime): MonthdayRange {...}{.inline, raises: [], tags: [].}

  The day of the month, in the range 1 to 31. Source Edit

    proc month(dt: DateTime): Month {...}{.raises: [], tags: [].}

  The month as an enum, the ordinal value is in the range 1 to 12. Source Edit

    proc year(dt: DateTime): int {...}{.inline, raises: [], tags: [].}

  The year, using astronomical year numbering (meaning that before year 1 is year 0, then year -1 and so on). Source Edit

    proc weekday(dt: DateTime): WeekDay {...}{.inline, raises: [], tags: [].}

  The day of the week as an enum, the ordinal value is in the range 0 (monday) to 6 (sunday). Source Edit

    proc yearday(dt: DateTime): YeardayRange {...}{.inline, raises: [], tags: [].}

  The number of days since January 1, in the range 0 to 365. Source Edit

    proc isDst(dt: DateTime): bool {...}{.inline, raises: [], tags: [].}

  Determines whether DST is in effect. Always false for the JavaScript backend. Source Edit

    proc timezone(dt: DateTime): Timezone {...}{.inline, raises: [], tags: [].}

  The timezone represented as an implementation of `Timezone`. Source Edit

    proc utcOffset(dt: DateTime): int {...}{.inline, raises: [], tags: [].}

  The offset in seconds west of UTC, including any offset due to DST. Note that the sign of this number is the opposite of the one in a formatted offset string like `+01:00` (which would be equivalent to the UTC offset `-3600`). Source Edit

    proc isInitialized(dt: DateTime): bool {...}{.raises: [], tags: [].}

  Example:

      doAssert now().isInitialized
      doAssert not default(DateTime).isInitialized

  Source Edit

    proc isLeapDay(dt: DateTime): bool {...}{.raises: [], tags: [].}

  Returns whether `t` is a leap day, i.e. Feb 29 in a leap year. This matters as it affects time offset calculations.

  Example:

      let dt = initDateTime(29, mFeb, 2020, 00, 00, 00, utc())
      doAssert dt.isLeapDay
      doAssert dt+1.years-1.years != dt
      let dt2 = initDateTime(28, mFeb, 2020, 00, 00, 00, utc())
      doAssert not dt2.isLeapDay
      doAssert dt2+1.years-1.years == dt2
      doAssertRaises(Exception): discard initDateTime(29, mFeb, 2021, 00, 00, 00, utc())

  Source Edit

    proc toTime(dt: DateTime): Time {...}{.tags: [], raises: [], gcsafe, locks: 0.}

  Converts a `DateTime` to a `Time` representing the same point in time. Source Edit

    proc newTimezone(name: string; zonedTimeFromTimeImpl: proc (time: Time): ZonedTime {...}{.
        tags: [], raises: [], gcsafe, locks: 0.}; zonedTimeFromAdjTimeImpl: proc (
        adjTime: Time): ZonedTime {...}{.tags: [], raises: [], gcsafe, locks: 0.}): owned
        Timezone {...}{.raises: [], tags: [].}

  Create a new `Timezone`.

  `zonedTimeFromTimeImpl` and `zonedTimeFromAdjTimeImpl` is used as the underlying implementations for `zonedTimeFromTime` and `zonedTimeFromAdjTime`.

  If possible, the name parameter should match the name used in the tz database. If the timezone doesn't exist in the tz database, or if the timezone name is unknown, then any string that describes the timezone unambiguously can be used. Note that the timezones name is used for checking equality!

  Example:

      proc utcTzInfo(time: Time): ZonedTime =
        ZonedTime(utcOffset: 0, isDst: false, time: time)
      let utc = newTimezone("Etc/UTC", utcTzInfo, utcTzInfo)

  Source Edit

    proc name(zone: Timezone): string {...}{.raises: [], tags: [].}

  The name of the timezone.

  If possible, the name will be the name used in the tz database. If the timezone doesn't exist in the tz database, or if the timezone name is unknown, then any string that describes the timezone unambiguously might be used. For example, the string "LOCAL" is used for the systems local timezone.

  See also: https://en.wikipedia.org/wiki/Tz_database

  Source Edit

    proc zonedTimeFromTime(zone: Timezone; time: Time): ZonedTime {...}{.raises: [],
        tags: [].}

  Returns the `ZonedTime` for some point in time. Source Edit

    proc zonedTimeFromAdjTime(zone: Timezone; adjTime: Time): ZonedTime {...}{.
        raises: [], tags: [].}

  Returns the `ZonedTime` for some local time.

  Note that the `Time` argument does not represent a point in time, it represent a local time! E.g if `adjTime` is `fromUnix(0)`, it should be interpreted as 1970-01-01T00:00:00 in the `zone` timezone, not in UTC.

  Source Edit

    proc `$`(zone: Timezone): string {...}{.raises: [], tags: [].}

  Returns the name of the timezone. Source Edit

    proc `==`(zone1, zone2: Timezone): bool {...}{.raises: [], tags: [].}

  Two `Timezone`'s are considered equal if their name is equal.

  Example:

      doAssert local() == local()
      doAssert local() != utc()

  Source Edit

    proc inZone(time: Time; zone: Timezone): DateTime {...}{.tags: [], raises: [],
        gcsafe, locks: 0.}

  Convert `time` into a `DateTime` using `zone` as the timezone. Source Edit

    proc inZone(dt: DateTime; zone: Timezone): DateTime {...}{.tags: [], raises: [],
        gcsafe, locks: 0.}

  Returns a `DateTime` representing the same point in time as `dt` but using `zone` as the timezone. Source Edit

    proc utc(): Timezone {...}{.raises: [], tags: [].}

  Get the `Timezone` implementation for the UTC timezone.

  Example:

      doAssert now().utc.timezone == utc()
      doAssert utc().name == "Etc/UTC"

  Source Edit

    proc local(): Timezone {...}{.raises: [], tags: [].}

  Get the `Timezone` implementation for the local timezone.

  Example:

      doAssert now().timezone == local()
      doAssert local().name == "LOCAL"

  Source Edit

    proc utc(dt: DateTime): DateTime {...}{.raises: [], tags: [].}

  Shorthand for `dt.inZone(utc())`. Source Edit

    proc local(dt: DateTime): DateTime {...}{.raises: [], tags: [].}

  Shorthand for `dt.inZone(local())`. Source Edit

    proc utc(t: Time): DateTime {...}{.raises: [], tags: [].}

  Shorthand for `t.inZone(utc())`. Source Edit

    proc local(t: Time): DateTime {...}{.raises: [], tags: [].}

  Shorthand for `t.inZone(local())`. Source Edit

    proc now(): DateTime {...}{.tags: [TimeEffect], gcsafe, locks: 0, raises: [].}

  Get the current time as a `DateTime` in the local timezone.

  Shorthand for `getTime().local`.

  Source Edit

    proc initDateTime(monthday: MonthdayRange; month: Month; year: int;
                      hour: HourRange; minute: MinuteRange; second: SecondRange;
                      nanosecond: NanosecondRange; zone: Timezone = local()): DateTime {...}{.
        raises: [], tags: [].}

  Create a new DateTime in the specified timezone.

  Example:

      let dt1 = initDateTime(30, mMar, 2017, 00, 00, 00, 00, utc())
      doAssert $dt1 == "2017-03-30T00:00:00Z"

  Source Edit

    proc initDateTime(monthday: MonthdayRange; month: Month; year: int;
                      hour: HourRange; minute: MinuteRange; second: SecondRange;
                      zone: Timezone = local()): DateTime {...}{.raises: [], tags: [].}

  Create a new DateTime in the specified timezone.

  Example:

      let dt1 = initDateTime(30, mMar, 2017, 00, 00, 00, utc())
      doAssert $dt1 == "2017-03-30T00:00:00Z"

  Source Edit

    proc `+`(dt: DateTime; dur: Duration): DateTime {...}{.raises: [], tags: [].}

  Example:

      let dt = initDateTime(30, mMar, 2017, 00, 00, 00, utc())
      let dur = initDuration(hours = 5)
      doAssert $(dt + dur) == "2017-03-30T05:00:00Z"

  Source Edit

    proc `-`(dt: DateTime; dur: Duration): DateTime {...}{.raises: [], tags: [].}

  Example:

      let dt = initDateTime(30, mMar, 2017, 00, 00, 00, utc())
      let dur = initDuration(days = 5)
      doAssert $(dt - dur) == "2017-03-25T00:00:00Z"

  Source Edit

    proc `-`(dt1, dt2: DateTime): Duration {...}{.raises: [], tags: [].}

  Compute the duration between `dt1` and `dt2`.

  Example:

      let dt1 = initDateTime(30, mMar, 2017, 00, 00, 00, utc())
      let dt2 = initDateTime(25, mMar, 2017, 00, 00, 00, utc())

      doAssert dt1 - dt2 == initDuration(days = 5)

  Source Edit

    proc `<`(a, b: DateTime): bool {...}{.raises: [], tags: [].}

  Returns true if `a` happened before `b`. Source Edit

    proc `<=`(a, b: DateTime): bool {...}{.raises: [], tags: [].}

  Returns true if `a` happened before or at the same time as `b`. Source Edit

    proc `==`(a, b: DateTime): bool {...}{.raises: [], tags: [].}

  Returns true if `a` and `b` represent the same point in time. Source Edit

    proc `+=`(a: var DateTime; b: Duration) {...}{.raises: [], tags: [].}

  Source Edit

    proc `-=`(a: var DateTime; b: Duration) {...}{.raises: [], tags: [].}

  Source Edit

    proc getDateStr(dt = now()): string {...}{.gcsafe, extern: "nt$1",
                                          tags: [TimeEffect], raises: [].}

  Gets the current local date as a string of the format `YYYY-MM-DD`.

  Example:

      echo getDateStr(now() - 1.months)

  Source Edit

    proc getClockStr(dt = now()): string {...}{.gcsafe, extern: "nt$1",
                                           tags: [TimeEffect], raises: [].}

  Gets the current local clock time as a string of the format `HH:mm:ss`.

  Example:

      echo getClockStr(now() - 1.hours)

  Source Edit

    proc `$`(f: TimeFormat): string {...}{.raises: [], tags: [].}

  Returns the format string that was used to construct `f`.

  Example:

      let f = initTimeFormat("yyyy-MM-dd")
      doAssert $f == "yyyy-MM-dd"

  Source Edit

    proc initTimeFormat(format: string): TimeFormat {...}{.
        raises: [TimeFormatParseError], tags: [].}

  Construct a new time format for parsing & formatting time types.

  See Parsing and formatting dates for documentation of the `format` argument.

  Example:

      let f = initTimeFormat("yyyy-MM-dd")
      doAssert "2000-01-01" == "2000-01-01".parse(f).format(f)

  Source Edit

    proc format(dt: DateTime; f: TimeFormat; loc: DateTimeLocale = DefaultLocale): string {...}{.
        raises: [], tags: [].}

  Format `dt` using the format specified by `f`.

  Example:

      let f = initTimeFormat("yyyy-MM-dd")
      let dt = initDateTime(01, mJan, 2000, 00, 00, 00, utc())
      doAssert "2000-01-01" == dt.format(f)

  Source Edit

    proc format(dt: DateTime; f: string; loc: DateTimeLocale = DefaultLocale): string {...}{.
        raises: [TimeFormatParseError], tags: [].}

  Shorthand for constructing a `TimeFormat` and using it to format `dt`.

  See Parsing and formatting dates for documentation of the `format` argument.

  Example:

      let dt = initDateTime(01, mJan, 2000, 00, 00, 00, utc())
      doAssert "2000-01-01" == format(dt, "yyyy-MM-dd")

  Source Edit

    proc format(dt: DateTime; f: static[string]): string {...}{.raises: [].}

  Overload that validates `format` at compile time. Source Edit

    proc formatValue(result: var string; value: DateTime; specifier: string) {...}{.
        raises: [TimeFormatParseError], tags: [].}

  adapter for strformat. Not intended to be called directly. Source Edit

    proc format(time: Time; f: string; zone: Timezone = local()): string {...}{.
        raises: [TimeFormatParseError], tags: [].}

  Shorthand for constructing a `TimeFormat` and using it to format `time`. Will use the timezone specified by `zone`.

  See Parsing and formatting dates for documentation of the `f` argument.

  Example:

      var dt = initDateTime(01, mJan, 1970, 00, 00, 00, utc())
      var tm = dt.toTime()
      doAssert format(tm, "yyyy-MM-dd'T'HH:mm:ss", utc()) == "1970-01-01T00:00:00"

  Source Edit

    proc format(time: Time; f: static[string]; zone: Timezone = local()): string {...}{.
        raises: [].}

  Overload that validates `f` at compile time. Source Edit

    proc parse(input: string; f: TimeFormat; zone: Timezone = local();
               loc: DateTimeLocale = DefaultLocale): DateTime {...}{.
        raises: [TimeParseError, Defect], tags: [TimeEffect].}

  Parses `input` as a `DateTime` using the format specified by `f`. If no UTC offset was parsed, then `input` is assumed to be specified in the `zone` timezone. If a UTC offset was parsed, the result will be converted to the `zone` timezone.

  Month and day names from the passed in `loc` are used.

  Example:

      let f = initTimeFormat("yyyy-MM-dd")
      let dt = initDateTime(01, mJan, 2000, 00, 00, 00, utc())
      doAssert dt == "2000-01-01".parse(f, utc())

  Source Edit

    proc parse(input, f: string; tz: Timezone = local();
               loc: DateTimeLocale = DefaultLocale): DateTime {...}{.
        raises: [TimeParseError, TimeFormatParseError, Defect], tags: [TimeEffect].}

  Shorthand for constructing a `TimeFormat` and using it to parse `input` as a `DateTime`.

  See Parsing and formatting dates for documentation of the `f` argument.

  Example:

      let dt = initDateTime(01, mJan, 2000, 00, 00, 00, utc())
      doAssert dt == parse("2000-01-01", "yyyy-MM-dd", utc())

  Source Edit

    proc parse(input: string; f: static[string]; zone: Timezone = local();
               loc: DateTimeLocale = DefaultLocale): DateTime {...}{.
        raises: [TimeParseError, Defect].}

  Overload that validates `f` at compile time. Source Edit

    proc parseTime(input, f: string; zone: Timezone): Time {...}{.
        raises: [TimeParseError, TimeFormatParseError, Defect], tags: [TimeEffect].}

  Shorthand for constructing a `TimeFormat` and using it to parse `input` as a `DateTime`, then converting it a `Time`.

  See Parsing and formatting dates for documentation of the `format` argument.

  Example:

      let tStr = "1970-01-01T00:00:00+00:00"
      doAssert parseTime(tStr, "yyyy-MM-dd'T'HH:mm:sszzz", utc()) == fromUnix(0)

  Source Edit

    proc parseTime(input: string; f: static[string]; zone: Timezone): Time {...}{.
        raises: [TimeParseError, Defect].}

  Overload that validates `format` at compile time. Source Edit

    proc `$`(dt: DateTime): string {...}{.tags: [], raises: [], gcsafe, locks: 0.}

  Converts a `DateTime` object to a string representation. It uses the format `yyyy-MM-dd'T'HH:mm:sszzz`.

  Example:

      let dt = initDateTime(01, mJan, 2000, 12, 00, 00, utc())
      doAssert $dt == "2000-01-01T12:00:00Z"
      doAssert $default(DateTime) == "Uninitialized DateTime"

  Source Edit

    proc `$`(time: Time): string {...}{.tags: [], raises: [], gcsafe, locks: 0.}

  Converts a `Time` value to a string representation. It will use the local time zone and use the format `yyyy-MM-dd'T'HH:mm:sszzz`.

  Example:

      let dt = initDateTime(01, mJan, 1970, 00, 00, 00, local())
      let tm = dt.toTime()
      doAssert $tm == "1970-01-01T00:00:00" & format(dt, "zzz")

  Source Edit

    proc initTimeInterval(nanoseconds, microseconds, milliseconds, seconds, minutes,
                          hours, days, weeks, months, years: int = 0): TimeInterval {...}{.
        raises: [], tags: [].}

  Creates a new TimeInterval.

  This proc doesn't perform any normalization! For example, `initTimeInterval(hours = 24)` and `initTimeInterval(days = 1)` are not equal.

  You can also use the convenience procedures called `milliseconds`, `seconds`, `minutes`, `hours`, `days`, `months`, and `years`.

  Example:

      let day = initTimeInterval(hours = 24)
      let dt = initDateTime(01, mJan, 2000, 12, 00, 00, utc())
      doAssert $(dt + day) == "2000-01-02T12:00:00Z"
      doAssert initTimeInterval(hours = 24) != initTimeInterval(days = 1)

  Source Edit

    proc `+`(ti1, ti2: TimeInterval): TimeInterval {...}{.raises: [], tags: [].}

  Adds two `TimeInterval` objects together. Source Edit

    proc `-`(ti: TimeInterval): TimeInterval {...}{.raises: [], tags: [].}

  Reverses a time interval

  Example:

      let day = -initTimeInterval(hours = 24)
      doAssert day.hours == -24

  Source Edit

    proc `-`(ti1, ti2: TimeInterval): TimeInterval {...}{.raises: [], tags: [].}

  Subtracts TimeInterval `ti1` from `ti2`.

  Time components are subtracted one-by-one, see output:

  Example:

      let ti1 = initTimeInterval(hours = 24)
      let ti2 = initTimeInterval(hours = 4)
      doAssert (ti1 - ti2) == initTimeInterval(hours = 20)

  Source Edit

    proc `+=`(a: var TimeInterval; b: TimeInterval) {...}{.raises: [], tags: [].}

  Source Edit

    proc `-=`(a: var TimeInterval; b: TimeInterval) {...}{.raises: [], tags: [].}

  Source Edit

    proc between(startDt, endDt: DateTime): TimeInterval {...}{.raises: [], tags: [].}

  Gives the difference between `startDt` and `endDt` as a `TimeInterval`. The following guarantees about the result is given:
  - All fields will have the same sign.
  - If `startDt.timezone == endDt.timezone`, it is guaranteed that `startDt + between(startDt, endDt) == endDt`.
  - If `startDt.timezone != endDt.timezone`, then the result will be equivalent to `between(startDt.utc, endDt.utc)`.

  Example:

      var a = initDateTime(25, mMar, 2015, 12, 0, 0, utc())
      var b = initDateTime(1, mApr, 2017, 15, 0, 15, utc())
      var ti = initTimeInterval(years = 2, weeks = 1, hours = 3, seconds = 15)
      doAssert between(a, b) == ti
      doAssert between(a, b) == -between(b, a)

  Source Edit

    proc toParts(ti: TimeInterval): TimeIntervalParts {...}{.raises: [], tags: [].}

  Converts a `TimeInterval` into an array consisting of its time units, starting with nanoseconds and ending with years.

  This procedure is useful for converting `TimeInterval` values to strings. E.g. then you need to implement custom interval printing

  Example:

      var tp = toParts(initTimeInterval(years = 1, nanoseconds = 123))
      doAssert tp[Years] == 1
      doAssert tp[Nanoseconds] == 123

  Source Edit

    proc `$`(ti: TimeInterval): string {...}{.raises: [], tags: [].}

  Get string representation of `TimeInterval`.

  Example:

      doAssert $initTimeInterval(years = 1, nanoseconds = 123) ==
        "1 year and 123 nanoseconds"
      doAssert $initTimeInterval() == "0 nanoseconds"

  Source Edit

    proc nanoseconds(nanos: int): TimeInterval {...}{.inline, raises: [], tags: [].}

  TimeInterval of `nanos` nanoseconds. Source Edit

    proc microseconds(micros: int): TimeInterval {...}{.inline, raises: [], tags: [].}

  TimeInterval of `micros` microseconds. Source Edit

    proc milliseconds(ms: int): TimeInterval {...}{.inline, raises: [], tags: [].}

  TimeInterval of `ms` milliseconds. Source Edit

    proc seconds(s: int): TimeInterval {...}{.inline, raises: [], tags: [].}

  TimeInterval of `s` seconds.

  `echo getTime() + 5.seconds`

  Source Edit

    proc minutes(m: int): TimeInterval {...}{.inline, raises: [], tags: [].}

  TimeInterval of `m` minutes.

  `echo getTime() + 5.minutes`

  Source Edit

    proc hours(h: int): TimeInterval {...}{.inline, raises: [], tags: [].}

  TimeInterval of `h` hours.

  `echo getTime() + 2.hours`

  Source Edit

    proc days(d: int): TimeInterval {...}{.inline, raises: [], tags: [].}

  TimeInterval of `d` days.

  `echo getTime() + 2.days`

  Source Edit

    proc weeks(w: int): TimeInterval {...}{.inline, raises: [], tags: [].}

  TimeInterval of `w` weeks.

  `echo getTime() + 2.weeks`

  Source Edit

    proc months(m: int): TimeInterval {...}{.inline, raises: [], tags: [].}

  TimeInterval of `m` months.

  `echo getTime() + 2.months`

  Source Edit

    proc years(y: int): TimeInterval {...}{.inline, raises: [], tags: [].}

  TimeInterval of `y` years.

  `echo getTime() + 2.years`

  Source Edit

    proc `+`(dt: DateTime; interval: TimeInterval): DateTime {...}{.raises: [], tags: [].}

  Adds `interval` to `dt`. Components from `interval` are added in the order of their size, i.e. first the `years` component, then the `months` component and so on. The returned `DateTime` will have the same timezone as the input.

  Note that when adding months, monthday overflow is allowed. This means that if the resulting month doesn't have enough days it, the month will be incremented and the monthday will be set to the number of days overflowed. So adding one month to `31 October` will result in `31 November`, which will overflow and result in `1 December`.

  Example:

      let dt = initDateTime(30, mMar, 2017, 00, 00, 00, utc())
      doAssert $(dt + 1.months) == "2017-04-30T00:00:00Z"
      # This is correct and happens due to monthday overflow.
      doAssert $(dt - 1.months) == "2017-03-02T00:00:00Z"

  Source Edit

    proc `-`(dt: DateTime; interval: TimeInterval): DateTime {...}{.raises: [], tags: [].}

  Subtract `interval` from `dt`. Components from `interval` are subtracted in the order of their size, i.e. first the `years` component, then the `months` component and so on. The returned `DateTime` will have the same timezone as the input.

  Example:

      let dt = initDateTime(30, mMar, 2017, 00, 00, 00, utc())
      doAssert $(dt - 5.days) == "2017-03-25T00:00:00Z"

  Source Edit

    proc `+`(time: Time; interval: TimeInterval): Time {...}{.raises: [], tags: [].}

  Adds `interval` to `time`. If `interval` contains any years, months, weeks or days the operation is performed in the local timezone.

  Example:

      let tm = fromUnix(0)
      doAssert tm + 5.seconds == fromUnix(5)

  Source Edit

    proc `-`(time: Time; interval: TimeInterval): Time {...}{.raises: [], tags: [].}

  Subtracts `interval` from Time `time`. If `interval` contains any years, months, weeks or days the operation is performed in the local timezone.

  Example:

      let tm = fromUnix(5)
      doAssert tm - 5.seconds == fromUnix(0)

  Source Edit

    proc `+=`(a: var DateTime; b: TimeInterval) {...}{.raises: [], tags: [].}

  Source Edit

    proc `-=`(a: var DateTime; b: TimeInterval) {...}{.raises: [], tags: [].}

  Source Edit

    proc `+=`(t: var Time; b: TimeInterval) {...}{.raises: [], tags: [].}

  Source Edit

    proc `-=`(t: var Time; b: TimeInterval) {...}{.raises: [], tags: [].}

  Source Edit

    proc epochTime(): float {...}{.tags: [TimeEffect], raises: [].}

  Gets time after the UNIX epoch (1970) in seconds. It is a float because sub-second resolution is likely to be supported (depending on the hardware/OS).

  `getTime` should generally be preferred over this proc.

  Source Edit

    proc cpuTime(): float {...}{.tags: [TimeEffect], raises: [].}

  Gets time spent that the CPU spent to run the current process in seconds. This may be more useful for benchmarking than `epochTime`. However, it may measure the real time instead (depending on the OS). The value of the result has no meaning. To generate useful timing values, take the difference between the results of two `cpuTime` calls:

  Example:

      var t0 = cpuTime()
      # some useless work here (calculate fibonacci)
      var fib = @[0, 1, 1]
      for i in 1..10:
        fib.add(fib[^1] + fib[^2])
      echo "CPU time [s] ", cpuTime() - t0
      echo "Fib is [s] ", fib

  When the flag `--benchmarkVM` is passed to the compiler, this proc is also available at compile time Source Edit

    proc nanosecond=(dt: var DateTime; value: NanosecondRange) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc second=(dt: var DateTime; value: SecondRange) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc minute=(dt: var DateTime; value: MinuteRange) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc hour=(dt: var DateTime; value: HourRange) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc monthdayZero=(dt: var DateTime; value: int) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc monthZero=(dt: var DateTime; value: int) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc year=(dt: var DateTime; value: int) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc weekday=(dt: var DateTime; value: WeekDay) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc yearday=(dt: var DateTime; value: YeardayRange) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc isDst=(dt: var DateTime; value: bool) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc timezone=(dt: var DateTime; value: Timezone) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

    proc utcOffset=(dt: var DateTime; value: int) {...}{.
        deprecated: "Deprecated since v1.3.1", raises: [], tags: [].}

  Deprecated: Deprecated since v1.3.1
  Source Edit

# Templates

    template formatValue(result: var string; value: Time; specifier: string)

  adapter for `strformat`. Not intended to be called directly. Source Edit