tempo/time · gtempo

Example

time.literal("08:42:53")
|> time.add(duration.mintues(36))
// -> time.literal("09:18:53")

Example

time.literal("13:42:11")
|> time.compare(to: time.literal("13:42:11"))
// -> order.Eq

time.literal("15:32:01")
|> time.compare(to: time.literal("13:42:11"))
// -> order.Gt

time.literal("13:10:11")
|> time.compare(to: time.literal("13:42:11"))
// -> order.Lt

difference

</>

pub fn difference(from a: Time, to b: Time) -> Duration

Gets the difference between two times as a duration. Always prefer using duration.start_monotonic and duration.stop_monotonic to record live time passing, as it is more precise.

Example

time.literal("23:42:11.435")
|> time.difference(from: time.literal("23:42:09.743"))
|> duration.as_milliseconds
// -> 1692

time.literal("13:30:11")
|> time.difference(from: time.literal("13:55:13"))
|> duration.as_minutes
// -> -25

difference_abs

</>

pub fn difference_abs(a: Time, from b: Time) -> Duration

Gets the absolute difference between two times as a duration.

Example

time.literal("23:42:11.435")
|> time.difference(from: time.literal("23:42:09.743"))
|> duration.as_milliseconds
// -> 1692

time.literal("13:30:11")
|> time.difference(from: time.literal("13:55:13"))
|> duration.as_minutes
// -> 25

format

</>

pub fn format(time: Time, in fmt: String) -> String

Formats a time value using the provided format string. Implements the same formatting directives as the great Day.js library: https://day.js.org/docs/en/display/format.

Values can be escaped by putting brackets around them, like “[Hello!] HH”.

Available directives: H (hour), HH (two-digit hour), h (12-hour clock hour), hh (two-digit 12-hour clock hour), m (minute), mm (two-digit minute), s (second), ss (two-digit second), SSS (millisecond), SSSS (microsecond), SSSSS (nanosecond), A (AM/PM), a (am/pm).

Example

time.literal("13:42:11.314")
|> time.format("h:mm A")
// -> "1:42 PM"

time.literal("09:02:01.014920202")
|> time.format("HH:mm:ss SSS SSSS SSSSS")
// -> "09:02:01 014 014920 014920202"

naive_datetime.literal("13:02:01")
|> naive_datetime.format("H HH h hh m mm s ss a A [An ant]")
// -------------------> "13 13 1 01 2 02 1 01 pm PM An ant"

from_duration

</>

pub fn from_duration(duration: Duration) -> Time

Converts a duration to the equivalent time of day, assuming the duration epoch is “00:00:00”. Durations longer than 24 hours will be wrapped to fit within a 24 hour representation.

Example

duration.seconds(58)
|> time.from_duration
|> time.to_second_precision
|> time.to_string
// -> "00:00:58"

duration.minutes(17)
|> time.from_duration
|> time.to_string
// -> "00:17:00.000000000"

duration.hours(25)
|> time.from_duration
|> time.to_string
// -> "01:00:00.000000000"

duration.nanoseconds(-3_000_000_000)
|> time.from_duration
|> time.to_string
// -> "23:59:57.000000000"

from_string

</>

pub fn from_string(time: String) -> Result(Time, TimeParseError)

Converts a string to a time value. Accepted formats are hh:mm:ss.s, hhmmss.s, hh:mm:ss, hhmmss, hh:mm, or hhmm.

Example

time.from_string("00:00:00.000000300")
// -> Ok(time.literal("00:00:00.000000300"))

time.from_string("34:54:16")
// -> Error(tempo.TimeOutOfBounds)

from_tuple

</>

pub fn from_tuple(
  time: #(Int, Int, Int),
) -> Result(Time, TimeOutOfBoundsError)

Converts a tuple of hours, minutes, and seconds to a time value. Useful for using with another time library.

Example

#(13, 42, 11)
|> time.from_tuple
// -> time.literal("13:42:11")

from_tuple_nanosecond

</>

pub fn from_tuple_nanosecond(
  time: #(Int, Int, Int, Int),
) -> Result(Time, TimeOutOfBoundsError)

Converts a tuple of hours, minutes, seconds, and nanoseconds to a time value. Useful for using with another time library.

Example

#(13, 42, 11, 872000000)
|> time.from_tuple_nanosecond
|> time.to_milli_precision
// -> time.literal("13:42:11.872")

get_hour

</>

pub fn get_hour(time: Time) -> Int

Gets the hour value of a time.

Example

time.literal("13:42:11")
|> time.get_hour
// -> 13

get_minute

</>

pub fn get_minute(time: Time) -> Int

Gets the minute value of a time.

Example

time.literal("13:42:11")
|> time.get_minute
// -> 42

get_nanosecond

</>

pub fn get_nanosecond(time: Time) -> Int

Gets the nanosecond value of a time.

Example

time.literal("13:42:11.123")
|> time.get_nanosecond
// -> 123000000

get_second

</>

pub fn get_second(time: Time) -> Int

Gets the second value of a time.

Example

time.literal("13:42:11")
|> time.get_second
// -> 11

is_between

</>

pub fn is_between(
  time: Time,
  start: Boundary,
  and end: Boundary,
) -> Bool

Checks if a time is between two boundaries.

Example

time.literal("13:42:11")
|> time.is_between(
    Boundary(time.literal("05:00:00"), inclusive: True), 
    and: Boundary(time.literal("15:00:00"), inclusive: False),
  )
// -> True

is_earlier

</>

pub fn is_earlier(a: Time, than b: Time) -> Bool

Checks if the first time is earlier than the second time.

Example

time.literal("13:42:11")
|> time.is_earlier(than: time.literal("13:42:12"))
// -> True

time.literal("13:42:11")
|> time.is_earlier(than: time.literal("13:42:11"))
// -> False

time.literal("13:22:15")
|> time.is_earlier(than: time.literal("07:42:11"))
// -> False

is_earlier_or_equal

</>

pub fn is_earlier_or_equal(a: Time, to b: Time) -> Bool

Checks if the first time is earlier or equal to the second time.

Example

time.literal("13:42:11")
|> time.is_earlier_or_equal(to: time.literal("13:42:12"))
// -> True

time.literal("13:42:11")
|> time.is_earlier_or_equal(to: time.literal("13:42:11.000"))
// -> True

time.literal("13:22:15")
|> time.is_earlier_or_equal(to: time.literal("07:42:12"))
// -> False

is_equal

</>

pub fn is_equal(a: Time, to b: Time) -> Bool

Checks if the first time is equal to the second time.

Example

time.literal("13:42:11.000")
|> time.is_equal(to: time.literal("13:42:11"))
// -> True

time.literal("13:42:11.002")
|> time.is_equal(to: time.literal("13:42:11"))
// -> False

is_later

</>

pub fn is_later(a: Time, than b: Time) -> Bool

Checks if the first time is later than the second time.

Example

time.literal("13:22:15")
|> time.is_later(than: time.literal("07:42:11"))
// -> True

time.literal("13:42:11")
|> time.is_later(than: time.literal("13:42:12"))
// -> False

time.literal("13:42:11")
|> time.is_later(than: time.literal("13:42:11"))
// -> False

is_later_or_equal

</>

pub fn is_later_or_equal(a: Time, to b: Time) -> Bool

Checks if the first time is earlier or equal to the second time.

Example

time.literal("13:22:15")
|> time.is_later_or_equal(to: time.literal("07:42:12"))
// -> True

```gleam
time.literal("13:42")
|> time.is_later_or_equal(to: time.literal("13:42:00.000"))
// -> True

time.literal("13:42:11")
|> time.is_later_or_equal(to: time.literal("13:42:12"))
// -> False

is_outside

</>

pub fn is_outside(
  time: Time,
  start: Boundary,
  and end: Boundary,
) -> Bool

Checks if a time is outside of two boundaries.

Example

time.literal("13:42:11")
|> time.is_outside(
    time.Boundary(time.literal("05:00:00"), inclusive: True), 
    and: time.Boundary(time.literal("15:00:00"), inclusive: False),
  )
// -> False

left_in_day

</>

pub fn left_in_day(time: Time) -> Time

Converts a time to the equivalent time left in the day.

Example

time.literal("23:59:03") |> time.left_in_day
// -> time.literal("00:00:57")

time.literal("08:05:20") |> time.left_in_day
// -> time.literal("15:54:40")

literal

</>

pub fn literal(time: String) -> Time

Creates a new time value from a string literal, but will panic if the string is invalid. Accepted formats are hh:mm:ss.s, hhmmss.s, hh:mm:ss, hhmmss, hh:mm, or hhmm.

Useful for declaring time literals that you know are valid within your program.

Example

case 
  time.now_local() 
  |> time.is_later(than: time.literal("11:50:00")) 
{ 
  True -> "We are late!"
  False -> "No rush :)"
}

new

</>

pub fn new(
  hour: Int,
  minute: Int,
  second: Int,
) -> Result(Time, TimeOutOfBoundsError)

Creates a new time value with second precision.

Example

time.new(13, 42, 11)
// -> Ok(time.literal("13:42:11"))

time.new(53, 42, 61)
// -> Error(tempo.TimeOutOfBounds)

new_micro

</>

pub fn new_micro(
  hour: Int,
  minute: Int,
  second: Int,
  microsecond: Int,
) -> Result(Time, TimeOutOfBoundsError)

Creates a new time value with microsecond precision.

Example

time.new_micro(13, 42, 11, 20)
// -> Ok(time.literal("13:42:11.000020"))

time.new_micro(13, 42, 11, 200_000)
// -> Ok(time.literal("13:42:11.200000"))

time.new_micro(13, 42, 11, 7_500_000)
// -> Error(tempo.TimeOutOfBounds)

new_milli

</>

pub fn new_milli(
  hour: Int,
  minute: Int,
  second: Int,
  millisecond: Int,
) -> Result(Time, TimeOutOfBoundsError)

Creates a new time value with millisecond precision.

Example

time.new_milli(13, 42, 11, 20)
// -> Ok(time.literal("13:42:11.020"))

time.new_milli(13, 42, 11, 200)
// -> Ok(time.literal("13:42:11.200"))

time.new_milli(13, 42, 11, 7_500)
// -> Error(tempo.TimeOutOfBounds)

new_nano

</>

pub fn new_nano(
  hour: Int,
  minute: Int,
  second: Int,
  nanosecond: Int,
) -> Result(Time, TimeOutOfBoundsError)

Creates a new time value with nanosecond precision.

Example

time.new_nano(13, 42, 11, 20)
// -> Ok(time.literal("13:42:11.000000020"))

time.new_nano(13, 42, 11, 200_000_000)
// -> Ok(time.literal("13:42:11.200000000"))

time.new_nano(13, 42, 11, 7_500_000_000)
// -> Error(tempo.TimeOutOfBounds)

now_local

</>

pub fn now_local() -> Time

Gets the local wall time of the host. Always prefer using duration.start_monotonic to record time passing and time.now_unique to sort events by time.

Example

case 
  time.now_local() 
  |> time.is_later(than: time.literal("11:50:00")) 
{ 
  True -> "We are late!"
  False -> "No rush :)"
}

now_monotonic

</>

pub fn now_monotonic() -> Int

Gets the monotonic time of the host. Monotonic time is useful for timing events; now_utc and now_local should not be used for timing events. The duration module has nicer functions to use for timing events and should be preferred over this function.

Example

time.now_monotonic()
// -> -576_460_750_802_442_634

now_unique

</>

pub fn now_unique() -> Int

Gets a positive unique integer based on the monotonic time of the Erlang VM on the Erlang target. Returns the a value that starts at 1 and increments by 1 with each call on the JavaScript target. This is useful for tagging and then ordering events by time, but should not be assumed to represent wall time.

Example

time.now_unique()
// -> 1
time.now_unique()
// -> 2

now_utc

</>

pub fn now_utc() -> Time

Gets the UTC wall time of the host. Always prefer using duration.start_monotonic to record time passing and time.now_unique to sort events by time.

Example

case 
  time.now_utc() 
  |> time.is_later(than: time.literal("11:50:00")) 
{ 
  True -> "We are all late!"
  False -> "No rush :)"
}

parse

</>

pub fn parse(
  str: String,
  in fmt: String,
) -> Result(Time, TimeParseError)

Parses a time string in the provided format. Always prefer using this over parse_any. All parsed formats must have an hour and a second.

Values can be escaped by putting brackets around them, like “[Hello!] HH”.

Available directives: H (hour), HH (two-digit hour), h (12-hour clock hour), hh (two-digit 12-hour clock hour), m (minute), mm (two-digit minute), s (second), ss (two-digit second), SSS (millisecond), SSSS (microsecond), SSSSS (nanosecond), A (AM/PM), a (am/pm),

Example

time.parse("2024/06/08, 13:42:11", "YYYY/MM/DD")
// -> Ok(time.literal("13:42:11"))

time.parse("January 13, 2024", "MMMM DD, YYYY")
// -> Error(tempo.ParseMissingTime)

time.parse("Hi! 12 2 am", "[Hi!] h m a")
// -> Ok(time.literal("00:02:00"))

parse_any

</>

pub fn parse_any(str: String) -> Result(Time, Nil)

Tries to parse a given date string without a known format. It will not parse two digit years and will assume the month always comes before the day in a date. Will leave off any time offset values present.

Example

time.parse_any("2024.06.21 01:32 PM -04:00")
// -> Ok(time.literal("13:32:00"))

time.parse_any("2024.06.21")
// -> Error(tempo.ParseMissingTime)

since

</>

pub fn since(time: Time, since: Time) -> Duration

Returns a duration representing the time since a given time.

Example

time.literal("23:54:00")
|> time.since(time.literal("13:30:04"))
|> duration.as_hours
// -> 10

time.literal("12:30:54")
|> time.since(time.literal("22:00:00"))
|> duration.as_milliseconds
// -> 0

subtract

</>

pub fn subtract(a: Time, duration b: Duration) -> Time

Subtracts a duration from a time.

Example

time.literal("13:42:02")
|> time.subtract(duration.hours(2))
// -> time.literal("11:42:02")

to_duration

</>

pub fn to_duration(time: Time) -> Duration

Converts a time to duration, assuming the duration epoch is “00:00:00”.

Example

time.literal("00:00:00.000000300")
|> time.to_duration
|> duration.as_nanoseconds
// -> 300

time.literal("00:03:06")
|> time.to_duration 
|> duration.as_milliseconds
// -> 186_000

to_string

</>

pub fn to_string(time: Time) -> String

Converts a time value to a string in the format hh:mm:ss.s

Example

time.to_string(my_time)
// -> "21:53:03.534"

to_tuple

</>

pub fn to_tuple(time: Time) -> #(Int, Int, Int)

Returns a time value as a tuple of hours, minutes, and seconds. Useful for using with another time library.

Example

time.literal("13:42:11")
|> time.to_tuple
// -> #(13, 42, 11)

to_tuple_nanosecond

</>

pub fn to_tuple_nanosecond(time: Time) -> #(Int, Int, Int, Int)

Returns a time value as a tuple of hours, minutes, seconds, and nanoseconds. Useful for using with another time library.

Example

time.literal("13:42:11.872")
|> time.to_tuple_nanosecond
// -> #(13, 42, 11, 872000000)

until

</>

pub fn until(time: Time, until: Time) -> Duration

Returns a duration representing the time left until a given time.

Example

time.literal("23:54:00")
|> time.until(time.literal("23:59:04"))
|> duration.as_seconds
// -> 304

time.literal("23:59:03")
|> time.until(time.literal("22:00:00"))
|> duration.as_milliseconds
// -> 0

Example

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