Functions Dates

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Dates and times

The functions to get the current time, add days and months, parse and print dates, grouped by what you want to do. The From column says what a program needs before it can call one:

• built-in: nothing; it is always available.
• std/chrono: #import "std/chrono", then using chrono to call it by its bare name.
• datetime.bi: #include "datetime.bi".

Jump to: Get the current date and time · Time how long something takes · Make a date, a time or a date-time · Read the year, month, day and time · Add days, months and years · Compare dates and count the days between · Turn dates and durations into text · Read dates and durations from text · Weekdays, weeks and quarters · Month and weekday names · Jump to the start or end of a day, week, month or year · Leap years and month lengths · TimeSpan: make a duration · TimeSpan: totals and parts · TimeSpan: arithmetic and comparison · Work with UTC and time-zone offsets · Show a date the way the user's machine writes it · Convert to Unix time, FILETIME and other numbers · Check a value is valid, and the range limits · Set the system clock

Get the current date and time

Function	What it does	From
Date	Returns today's date as text in the form mm-dd-yyyy.	built-in
Time	Returns the current time as text in the form hh:mm:ss.	built-in
Now	Returns the current local date and time as a date serial.	datetime.bi
WallClock.UtcNow	Returns the current moment on the UTC timeline, read from the system clock.	std/chrono
WallClock.Now	Returns the local date and time, with the UTC offset in force at this moment.	std/chrono
WallClock.Today	Returns today's local date as a LocalDate.	std/chrono
WallClock.TimeOfDay	Returns the current local time of day as a LocalTime.	std/chrono
WallClock.Resolution	Returns the smallest step the wall clock reports, as a TimeSpan.	std/chrono

Time how long something takes

Function	What it does	From
Timer	Returns the seconds since a fixed starting point, for measuring elapsed time.	built-in
Stopwatch.StartNew	Creates a stopwatch that is already running.	std/chrono
Stopwatch.Stopwatch	Creates a stopped stopwatch on the monotonic clock, which never jumps.	std/chrono
Stopwatch.Start	Starts the stopwatch, or resumes it and keeps the time already measured.	std/chrono
Stopwatch.Stop_	Stops the stopwatch, freezing the elapsed time until it starts again.	std/chrono
Stopwatch.Reset	Stops the stopwatch and sets its elapsed time back to zero.	std/chrono
Stopwatch.Restart	Sets the elapsed time back to zero and keeps the stopwatch running.	std/chrono
Stopwatch.IsRunning	Returns true while the stopwatch is running.	std/chrono
Stopwatch.Elapsed	Returns the time measured so far as a TimeSpan.	std/chrono
Stopwatch.ElapsedMilliseconds	Returns the time measured so far in whole milliseconds.	std/chrono
Stopwatch.ElapsedTicks	Returns the time measured so far in 100 ns ticks.	std/chrono
Stopwatch.GetTimestamp	Returns the raw monotonic counter; divide a difference by Frequency to get seconds.	std/chrono
Stopwatch.Frequency	Returns how many counts per second the raw counter from GetTimestamp makes.	std/chrono
Stopwatch.IsHighResolution	Returns true if the platform counter is finer than the system tick.	std/chrono
CpuClock.ProcessTime	Returns the processor time this process has used so far, user and kernel together.	std/chrono
CpuClock.ProcessUserTime	Returns the processor time this process has spent running its own code.	std/chrono
CpuClock.ProcessKernelTime	Returns the processor time the OS has spent working on behalf of this process.	std/chrono
CpuClock.ThreadTime	Returns the processor time the calling thread has used, user and kernel together.	std/chrono
CpuClock.IsSupported	Returns true if the platform can report processor time.	std/chrono

Make a date, a time or a date-time

Function	What it does	From
DateSerial	Returns the date serial for a year, month and day; out-of-range values roll over.	datetime.bi
TimeSerial	Returns the fraction of a day for an hour, minute and second, to add to a date serial.	datetime.bi
DateTime	Creates a date-time from a year, month, day and optional time, or Invalid if none.	std/chrono
LocalDate.LocalDate	Creates a date with no time of day from a year, month and day, or Invalid if none.	std/chrono
LocalTime.LocalTime	Creates a time of day from hours, minutes, seconds and milliseconds; midnight if none.	std/chrono
Instant.Instant	Creates a moment on the UTC timeline from a tick count; Invalid with no argument.	std/chrono
Instant.FromTicks	Creates a moment from 100 ns ticks since 0001-01-01, or Invalid if out of range.	std/chrono
DateTime.FromDate	Returns a date-time at midnight on the given date.	std/chrono
DateTime.FromDateTime	Returns a date-time that joins a date and a time of day.	std/chrono
LocalDate.FromDayNumber	Creates a date from a count of days since 0001-01-01.	std/chrono
LocalTime.FromTicks	Creates a time of day from 100 ns ticks since midnight, or Invalid past a whole day.	std/chrono
LocalTime.Midnight	Returns the time of day 00:00:00.	std/chrono
LocalTime.Noon	Returns the time of day 12:00:00.	std/chrono

Read the year, month, day and time

Function	What it does	From
Year	Returns the year of a date serial.	datetime.bi
Month	Returns the month of a date serial, 1 to 12.	datetime.bi
Day	Returns the day of the month of a date serial.	datetime.bi
Hour	Returns the hour of a date serial, 0 to 23.	datetime.bi
Minute	Returns the minute of a date serial.	datetime.bi
Second	Returns the second of a date serial.	datetime.bi
DatePart	Returns one part of a date serial, such as its year, quarter, week or hour.	datetime.bi
DateTime.Year	Returns the year, 1 to 9999.	std/chrono
DateTime.Month	Returns the month, 1 to 12.	std/chrono
DateTime.Day	Returns the day of the month, starting at 1.	std/chrono
DateTime.Hour	Returns the hour, 0 to 23.	std/chrono
DateTime.Minute	Returns the minute, 0 to 59.	std/chrono
DateTime.Second	Returns the second, 0 to 59.	std/chrono
DateTime.Millisecond	Returns the milliseconds within the second, 0 to 999.	std/chrono
DateTime.Microsecond	Returns the microseconds within the second, the milliseconds included.	std/chrono
DateTime.TickOfDay	Returns the time of day as one number: 100 ns ticks since midnight.	std/chrono
DateTime.GetDate	Returns the date part as a LocalDate, dropping the time and the offset.	std/chrono
DateTime.GetTimeOfDay	Returns the time-of-day part as a LocalTime.	std/chrono
LocalDate.Year	Returns the year, 1 to 9999.	std/chrono
LocalDate.Month	Returns the month, 1 to 12.	std/chrono
LocalDate.Day	Returns the day of the month, starting at 1.	std/chrono
LocalTime.Hour	Returns the hour, 0 to 23.	std/chrono
LocalTime.Minute	Returns the minute, 0 to 59.	std/chrono
LocalTime.Second	Returns the second, 0 to 59.	std/chrono
LocalTime.Millisecond	Returns the milliseconds within the second, 0 to 999.	std/chrono
LocalTime.Microsecond	Returns the microseconds within the second, the milliseconds included.	std/chrono

Add days, months and years

Function	What it does	From
DateAdd	Returns a date serial moved by a number of years, months, days, hours or other units.	datetime.bi
AddDays	Adds days of exactly 24 hours, so the clock time can shift across a DST change.	std/chrono
AddCalendarDays	Adds calendar days, keeping the same clock time across a DST change.	std/chrono
AddMonths	Adds calendar months and leaves the UTC offset untouched.	std/chrono
AddCalendarMonths	Adds calendar months, then works out the UTC offset again for the new date.	std/chrono
Instant.Add	Returns the date-time moved forward by a TimeSpan.	std/chrono
Instant.Subtract	Returns the date-time moved back by a TimeSpan, or Invalid past the earliest date.	std/chrono
DateTime.AddTicks	Returns the date-time moved by a number of 100 ns ticks.	std/chrono
DateTime.AddMilliseconds	Returns the date-time moved by a number of milliseconds, fractions allowed.	std/chrono
DateTime.AddSeconds	Returns the date-time moved by a number of seconds, fractions allowed.	std/chrono
DateTime.AddMinutes	Returns the date-time moved by a number of minutes, fractions allowed.	std/chrono
DateTime.AddHours	Returns the date-time moved by a number of hours, fractions allowed.	std/chrono
DateTime.AddDays	Returns the date-time moved by days of exactly 24 hours, fractions allowed.	std/chrono
DateTime.AddMonths	Returns the date-time moved by whole months, clamping the day to the month's end.	std/chrono
DateTime.AddYears	Returns the date-time moved by whole years; 29 February becomes the 28th if needed.	std/chrono
DateTime.AddCalendarDays	Returns the same clock time a number of days later, even across a DST change.	std/chrono
DateTime.AddCalendarMonths	Returns the same clock time some months later, clamping the day to the month's end.	std/chrono
DateTime.AddCalendarYears	Returns the same clock time some years later, with the UTC offset worked out again.	std/chrono
LocalDate.AddDays	Returns the date moved by a number of days.	std/chrono
LocalDate.AddMonths	Returns the date moved by whole months, clamping the day to the month's end.	std/chrono
LocalDate.AddYears	Returns the date moved by whole years; 29 February becomes the 28th if needed.	std/chrono

Compare dates and count the days between

Function	What it does	From
DateDiff	Counts the years, months, days or other units between two date serials.	datetime.bi
LocalDate.DayNumber	Returns the days since 0001-01-01; subtract two to count the days between dates.	std/chrono
Instant.CompareTo	Returns -1, 0 or 1 to order two moments, or -2 if either is Invalid.	std/chrono
LocalDate.CompareTo	Returns -1, 0 or 1 to order two dates, or -2 if either is Invalid.	std/chrono
LocalTime.CompareTo	Returns -1, 0 or 1 to order two times of day, or -2 if either is Invalid.	std/chrono

Turn dates and durations into text

Function	What it does	From
Instant.ToIsoString	Returns the date-time as ISO 8601 text, with Z or the offset when it has one.	std/chrono
Instant.ToString	Returns ISO 8601 text, or the date-time laid out by a pattern such as "yyyy-MM-dd".	std/chrono
DateTime.TryFormat	Formats the date-time with a pattern into a variable; returns false if the pattern is bad.	std/chrono
LocalDate.ToIsoString	Returns the date as text in the form 2026-08-13, or empty text if it is Invalid.	std/chrono
LocalDate.ToString	Returns the date as ISO 8601 text, the same as ToIsoString.	std/chrono
LocalTime.ToIsoString	Returns the time of day as ISO 8601 text, such as 14:30:05.	std/chrono
LocalTime.ToString	Returns the time of day as ISO 8601 text, the same as ToIsoString.	std/chrono
TimeSpan.ToIsoString	Returns the duration as ISO 8601 text, such as PT1H30M.	std/chrono
TimeSpan.ToString	Returns the duration as ISO 8601 text, the same as ToIsoString.	std/chrono

Read dates and durations from text

Function	What it does	From
DateValue	Returns the date serial for text written in the system's date format.	datetime.bi
TimeValue	Returns the date serial of a time written like 23:59:59 or 11:59:59PM.	datetime.bi
IsDate	Returns true if the text can be read as a date in the system's date format.	datetime.bi
Instant.ParseIso	Reads ISO 8601 text into a date-time, or Invalid if it is not ISO 8601.	std/chrono
Instant.TryParseIso	Reads ISO 8601 text into a date-time; returns false and sets it Invalid on failure.	std/chrono
DateTime.TryParse	Reads ISO 8601 text into a date-time, the same as TryParseIso.	std/chrono
DateTime.ParseExact	Reads text laid out by a pattern such as "dd/MM/yyyy", or Invalid if it does not match.	std/chrono
DateTime.TryParseExact	Reads text laid out by a pattern into a date-time; returns false if it does not match.	std/chrono
LocalDate.ParseIso	Reads ISO text such as 2026-08-13 into a date, or Invalid on failure.	std/chrono
LocalDate.TryParseIso	Reads ISO text into a date; returns false and sets it Invalid on failure.	std/chrono
LocalTime.ParseIso	Reads ISO text such as 14:30:05 into a time of day, or Invalid on failure.	std/chrono
LocalTime.TryParseIso	Reads ISO text into a time of day; returns false and sets it Invalid on failure.	std/chrono
TimeSpan.ParseIso	Reads an ISO 8601 duration such as P1DT2H into a TimeSpan, or Invalid on failure.	std/chrono
TimeSpan.TryParseIso	Reads an ISO 8601 duration; returns false and sets it Invalid on failure.	std/chrono

Weekdays, weeks and quarters

Function	What it does	From
Weekday	Returns the day of the week, 1 to 7, counting from Sunday unless told otherwise.	datetime.bi
DateTime.DayOfWeek	Returns the day of the week, 1 for Monday to 7 for Sunday.	std/chrono
DateTime.DayOfYear	Returns the day of the year, starting at 1.	std/chrono
DateTime.IsoWeek	Returns the ISO week number, 1 to 53; pair it with IsoWeekYear.	std/chrono
DateTime.IsoWeekYear	Returns the year the ISO week belongs to, which can differ from Year near New Year.	std/chrono
DateTime.Quarter	Returns the calendar quarter, 1 to 4.	std/chrono
LocalDate.DayOfWeek	Returns the day of the week, 1 for Monday to 7 for Sunday.	std/chrono
LocalDate.DayOfYear	Returns the day of the year, starting at 1.	std/chrono
LocalDate.IsoWeek	Returns the ISO week number, 1 to 53; pair it with IsoWeekYear.	std/chrono
LocalDate.IsoWeekYear	Returns the year the ISO week belongs to, which can differ from Year near New Year.	std/chrono
LocalDate.Quarter	Returns the calendar quarter, 1 to 4.	std/chrono

Month and weekday names

Function	What it does	From
MonthName	Returns the name of a month number in the system's language, or its abbreviation.	datetime.bi
WeekdayName	Returns the name of a weekday number in the system's language, or its abbreviation.	datetime.bi
DateTime.MonthName	Returns a month's name in the user's language, or its abbreviation.	std/chrono
DateTime.WeekdayName	Returns a weekday's name in the user's language, 1 being Monday, or its abbreviation.	std/chrono

Jump to the start or end of a day, week, month or year

Function	What it does	From
DateTime.StartOfDay	Returns midnight at the start of the same day, keeping the offset.	std/chrono
DateTime.EndOfDay	Returns the last tick of the same day, 23:59:59.9999999.	std/chrono
DateTime.StartOfWeek	Returns midnight on the first day of the week, Monday unless told otherwise.	std/chrono
DateTime.StartOfMonth	Returns midnight on the first day of the month.	std/chrono
DateTime.EndOfMonth	Returns the last tick of the last day of the month.	std/chrono
DateTime.StartOfYear	Returns midnight on 1 January of the same year.	std/chrono
DateTime.EndOfYear	Returns the last tick of 31 December of the same year.	std/chrono
DateTime.NextWeekday	Returns the same time on the next given weekday, always strictly later.	std/chrono
DateTime.PrevWeekday	Returns the same time on the previous given weekday, always strictly earlier.	std/chrono
DateTime.IsFirstDayOfMonth	Returns true if the date is the first day of its month.	std/chrono
DateTime.IsLastDayOfMonth	Returns true if the date is the last day of its month.	std/chrono
LocalDate.StartOfMonth	Returns the first day of the date's month.	std/chrono
LocalDate.EndOfMonth	Returns the last day of the date's month.	std/chrono
LocalDate.IsFirstDayOfMonth	Returns true if the date is the first day of its month.	std/chrono
LocalDate.IsLastDayOfMonth	Returns true if the date is the last day of its month.	std/chrono

Leap years and month lengths

Function	What it does	From
DateTime.IsLeapYear	Returns true if a year is a leap year under the full Gregorian rule.	std/chrono
DateTime.DaysInMonth	Returns the number of days in a month of a given year.	std/chrono
DateTime.DaysInYear	Returns 365 or 366, the number of days in a year.	std/chrono
DateTime.WeeksInYear	Returns 52 or 53, the number of ISO weeks in a year.	std/chrono

TimeSpan: make a duration

Function	What it does	From
TimeSpan.TimeSpan	Creates a duration from ticks, or from hours, minutes and seconds, with or without days.	std/chrono
TimeSpan.FromDays	Returns a duration of a number of days, fractions allowed.	std/chrono
TimeSpan.FromHours	Returns a duration of a number of hours, fractions allowed.	std/chrono
TimeSpan.FromMinutes	Returns a duration of a number of minutes, fractions allowed.	std/chrono
TimeSpan.FromSeconds	Returns a duration of a number of seconds, fractions allowed.	std/chrono
TimeSpan.FromMilliseconds	Returns a duration of a number of milliseconds, fractions allowed.	std/chrono
TimeSpan.FromMicroseconds	Returns a duration of a whole number of microseconds.	std/chrono
TimeSpan.FromTicks	Returns a duration of an exact number of 100 ns ticks.	std/chrono
TimeSpan.Zero	Returns a duration of zero, the same as a new TimeSpan.	std/chrono

TimeSpan: totals and parts

Function	What it does	From
TimeSpan.TotalDays	Returns the whole duration in days, with a fraction.	std/chrono
TimeSpan.TotalHours	Returns the whole duration in hours, with a fraction.	std/chrono
TimeSpan.TotalMinutes	Returns the whole duration in minutes, with a fraction.	std/chrono
TimeSpan.TotalSeconds	Returns the whole duration in seconds, with a fraction.	std/chrono
TimeSpan.TotalMilliseconds	Returns the whole duration in milliseconds, with a fraction.	std/chrono
TimeSpan.TotalMicroseconds	Returns the whole duration in whole microseconds.	std/chrono
TimeSpan.Days	Returns the days part of the duration, negative for a negative span.	std/chrono
TimeSpan.Hours	Returns the hours part, 0 to 23, negative for a negative span.	std/chrono
TimeSpan.Minutes	Returns the minutes part, 0 to 59, negative for a negative span.	std/chrono
TimeSpan.Seconds	Returns the seconds part, 0 to 59, negative for a negative span.	std/chrono
TimeSpan.Milliseconds	Returns the milliseconds part, 0 to 999, negative for a negative span.	std/chrono
TimeSpan.Microseconds	Returns the microseconds within the second, the milliseconds included.	std/chrono
TimeSpan.Ticks	Returns the duration as a count of 100 ns ticks.	std/chrono
TimeSpan.IsZero	Returns true if the duration is exactly zero, and false if it is Invalid.	std/chrono
TimeSpan.IsNegative	Returns true if the duration is below zero.	std/chrono

TimeSpan: arithmetic and comparison

Function	What it does	From
TimeSpan.Add	Returns the sum of two durations, or Invalid on overflow.	std/chrono
TimeSpan.Subtract	Returns the difference of two durations, which may be negative.	std/chrono
TimeSpan.Multiply	Returns the duration scaled by a factor, fractions allowed.	std/chrono
TimeSpan.Divide	Returns the duration divided by a number, or Invalid when dividing by zero.	std/chrono
TimeSpan.DivideBy	Returns how many times one duration fits in another, as a double.	std/chrono
TimeSpan.Negate	Returns the duration with its sign flipped.	std/chrono
TimeSpan.Duration	Returns the absolute value of the duration.	std/chrono
TimeSpan.CompareTo	Returns -1, 0 or 1 to order two durations, or -2 if either is Invalid.	std/chrono

Work with UTC and time-zone offsets

Function	What it does	From
DateTime.WithOffset	Attaches a UTC offset in minutes, keeping the clock reading and changing the moment.	std/chrono
DateTime.ToOffset	Converts to another UTC offset, keeping the moment and changing the clock reading.	std/chrono
DateTime.OffsetMinutes	Returns the UTC offset in minutes; check HasOffset first, as no offset reads 32767.	std/chrono
DateTime.HasOffset	Returns true if the date-time carries a UTC offset.	std/chrono
DateTime.IsUtc	Returns true if the offset is zero; a date-time with no offset is not UTC.	std/chrono
DateTime.ToInstant	Returns the moment the date-time names, or Invalid if it has no offset.	std/chrono
DateTime.AssumeUtc	Returns the moment the date-time names if its clock reading is taken as UTC.	std/chrono
DateTime.ToLocal	Returns the same moment shown at the machine's local UTC offset.	std/chrono
DateTime.FromInstant	Returns the date-time a moment shows on a clock with the given UTC offset.	std/chrono
TimeZoneInfo.LocalOffsetAt	Returns the local zone's UTC offset in minutes at a given moment, DST included.	std/chrono
TimeZoneInfo.LocalOffset	Returns the local zone's UTC offset in minutes right now.	std/chrono
TimeZoneInfo.IsDaylightSavingTime	Returns true if daylight saving time is in force in the local zone at a given moment.	std/chrono
TimeZoneInfo.SupportsDaylightSavingTime	Returns true if the local zone observes daylight saving time at all.	std/chrono
TimeZoneInfo.StandardName	Returns the OS's name for the local zone's standard time.	std/chrono
TimeZoneInfo.DaylightName	Returns the OS's name for the local zone's daylight saving time.	std/chrono

Show a date the way the user's machine writes it

Function	What it does	From
DateTime.ToLocaleDateString	Returns the date as the machine's locale writes it, for display only.	std/chrono
DateTime.ToLocaleTimeString	Returns the time of day as the machine's locale writes it, for display only.	std/chrono
DateTime.ToLocaleString	Returns the date and time as the machine's locale writes them, for display only.	std/chrono

Convert to Unix time, FILETIME and other numbers

Function	What it does	From
Instant.FromUnixSeconds	Returns the moment a number of seconds after 1970-01-01 UTC; negative is earlier.	std/chrono
Instant.FromUnixMilliseconds	Returns the moment a number of milliseconds after 1970-01-01 UTC.	std/chrono
Instant.FromUnixMicroseconds	Returns the moment a number of microseconds after 1970-01-01 UTC.	std/chrono
Instant.UnixSeconds	Returns the whole seconds since 1970-01-01 UTC, dropping any fraction.	std/chrono
Instant.UnixMilliseconds	Returns the milliseconds since 1970-01-01 UTC.	std/chrono
Instant.UnixMicroseconds	Returns the microseconds since 1970-01-01 UTC.	std/chrono
Instant.Ticks	Returns the 100 ns ticks since 0001-01-01, counted on the value's own clock.	std/chrono
LocalTime.Ticks	Returns the time of day as 100 ns ticks since midnight.	std/chrono
DateTime.Serial	Returns the date-time as a date serial: days since 1899-12-30, with a fraction.	std/chrono
DateTime.FromSerial	Creates a date-time from a date serial, the days since 1899-12-30.	std/chrono
DateTime.OleDate	Returns the date-time as an OLE automation date, the number Excel and ADO use.	std/chrono
DateTime.FromOleDate	Creates a date-time from an OLE automation date.	std/chrono
DateTime.FileTime	Returns the date-time as a Windows FILETIME: 100 ns ticks since 1601-01-01.	std/chrono
DateTime.FromFileTime	Creates a UTC date-time from a Windows FILETIME.	std/chrono
DateTime.JulianDay	Returns the Julian day, a fractional day count whose days start at noon.	std/chrono
DateTime.JulianDayNumber	Returns the whole Julian day number, without the fraction.	std/chrono
DateTime.FromJulianDay	Creates a date-time from a fractional Julian day.	std/chrono

Check a value is valid, and the range limits

Function	What it does	From
Instant.IsValid	Returns true if the date-time is a real, in-range value; the only safe test.	std/chrono
Instant.Invalid	Returns the Invalid date-time, which never equals anything, itself included.	std/chrono
Instant.MinValue	Returns the earliest date-time, midnight on 0001-01-01.	std/chrono
Instant.MaxValue	Returns the latest date-time, the last tick of 9999-12-31.	std/chrono
LocalDate.IsValid	Returns true if the date exists and is in range.	std/chrono
LocalDate.Invalid	Returns the Invalid date, which spreads to anything computed from it.	std/chrono
LocalDate.MinValue	Returns the earliest date, 0001-01-01.	std/chrono
LocalDate.MaxValue	Returns the latest date, 9999-12-31.	std/chrono
LocalTime.IsValid	Returns true if the time of day is in range.	std/chrono
LocalTime.Invalid	Returns the Invalid time of day, which never equals anything, itself included.	std/chrono
LocalTime.MaxValue	Returns the last tick of the day, 23:59:59.9999999.	std/chrono
TimeSpan.IsValid	Returns true unless the duration overflowed or came from bad input.	std/chrono
TimeSpan.Invalid	Returns the Invalid duration, which spreads to anything computed from it.	std/chrono
TimeSpan.MinValue	Returns the most negative duration a TimeSpan can hold.	std/chrono
TimeSpan.MaxValue	Returns the longest duration a TimeSpan can hold.	std/chrono

Set the system clock

Function	What it does	From
SetDate	Sets the system date from text like mm-dd-yyyy; needs admin rights, 0 means success.	built-in
SetTime	Sets the system time from text like hh:mm:ss; needs admin rights, 0 means success.	built-in

See Also

• Date and Time (Chrono) guide
• Date and Time Functions
• Date and time functions overview

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