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{
title: Formatting
description: Libdate API documentation.
}
Date and Time Formatting
---------------------
Formatting in libdate is done through the standard formatting
functionality, and there are actually no functions exposed by libdate.
Instead, you would write something like:
```{runmyr stdfmt1}
use date
const main = {
std.put("{}\n", date.now())
}
```
Custom formatting is done with a format option passed to std.format that
looks like `f=dateformat`. The format strings used resemble the strings
provided in strptime. Any characters preceded with a '%' are format
characters, otherwise they are copied to the output stream directly.
The format strings used to control formatting are also used to control parsing.
An example would look like:
```{runmyr stdfmt1}
use date
const main = {
std.put("{f=year is %Y, the day is %d}\n", date.now())
}
There are a number of short format options installed, specifically, `d`,
`D`, and `t`, which respectively map to the default date format, the
default date and time format, and the default time only format.
```{runmyr stdfmt1}
use date
const main = {
std.put("{d}\n", date.now())
std.put("{D}\n", date.now())
std.put("{T}\n", date.now())
}
```
Date and Time Formatting
---------------------
Both parsing and formatting use the same format strings. The
modifiers that are supported by libdate are listed below.
When possible, the default format verbs `D`, `d`, or `t`
should be used for formatting, and the default constants
`Datefmt`, `Datetimefmt`, or `Timefmt` should be used for
parsing.
Char | Meaning
------|----------------------------------------------
_%a_ | Abbreviated day of week: Mon, Tues, etc
_%A_ | Full day of week: Monday, Tuesday, Wednesday, etc
_%b_ | Abbreviated month of year: Jan, Feb, Mar, etc.
_%B_ | Full month of year: January, February, etc
_%c_ | Short for %Y-%m-%d %H:%M:%S %z (ISO 8601)
_%C_ | Century number of year, as two digit integer.
_%d_ | Day of month as a decimal number, 00 to 31.
_%D_ | Short for "%m/%d/%y (wtf america)"
_%e_ | Same as d, but space padded instead of zero padded.
_%F_ | Short for ISO 8601 date format %Y-%m-%d
_%h_ | Same as '%b'.
_%H_ | Hour number using the 24 hour clock, zero padded.
_%I_ | Hour number using the 12 hour clock, zero padded.
_%j_ | Day of year as a decimal number, 001 to 366.
_%k_ | Hour number using the 24 hour clock, space padded.
_%l_ | Hour number using the 12 hour clock, space padded.
_%m_ | The month number, zero padded.
_%M_ | The minute number, zero padded.
_%p_ | AM or PM, according to the time provided.
_%P_ | am or pm, according to the time provided.
_%r_ | 12 hour time: %I:%M %p
_%R_ | 24 hour time: %H:%M
_%s_ | The number of seconds since the Epoch
_%S_ | The second number, zero padded. 0 to 60.
_%T_ | The time including seconds in 24 hour format.
_%u_ | The day of the week in decimal, 0 to 7.
_%x_ | The date without the time. Same as %F
_%X_ | The date with the time. Same as %c
_%y_ | The final two digits of year.
_%Y_ | The full year, including century. BC dates are negative.
_%z_ | Timezone offset.
_%Z_ | Timezone name or abbreviation. Offset if this is not available.
_%%_ | A literal '%'
|
