denoland-deno/std/datetime/README.md

datetime

Simple helper to help parse date strings into Date, with additional functions.

Usage

The following symbols from unicode LDML are supported:

• yyyy - numeric year.

• yy - 2-digit year.

• M - numeric month.

• MM - 2-digit month.

• d - numeric day.

• dd - 2-digit day.

• H - numeric hour (0-23 hours).

• HH - 2-digit hour (00-23 hours).

• h - numeric hour (1-12 hours).

• hh - 2-digit hour (01-12 hours).

• m - numeric minute.

• mm - 2-digit minute.

• s - numeric second.

• ss - 2-digit second.

• S - 1-digit fractionalSecond.

• SS - 2-digit fractionalSecond.

• SSS - 3-digit fractionalSecond.

• a - dayPeriod, either AM or PM.

• 'foo' - quoted literal.

• ./- - unquoted literal.

parse

Takes an input string and a formatString to parse to a date.

import { parse } from 'https://deno.land/std@0.69.0/datetime/mod.ts'

parse("20-01-2019", "dd-MM-yyyy") // output : new Date(2019, 0, 20)
parse("2019-01-20", "yyyy-MM-dd") // output : new Date(2019, 0, 20)
parse("2019-01-20", "dd.MM.yyyy") // output : new Date(2019, 0, 20)
parse("01-20-2019 16:34", "MM-dd-yyyy HH:mm") // output : new Date(2019, 0, 20, 16, 34)
parse("01-20-2019 04:34 PM", "MM-dd-yyyy hh:mm a") // output : new Date(2019, 0, 20, 16, 34)
parse("16:34 01-20-2019", "HH:mm MM-dd-yyyy") // output : new Date(2019, 0, 20, 16, 34)
parse("01-20-2019 16:34:23.123", "MM-dd-yyyy HH:mm:ss.SSS") // output : new Date(2019, 0, 20, 16, 34, 23, 123)
...

format

Takes an input date and a formatString to format to a string.

import { format } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";

format(new Date(2019, 0, 20), "dd-MM-yyyy"); // output : "20-01-2019"
format(new Date(2019, 0, 20), "yyyy-MM-dd"); // output : "2019-01-20"
format(new Date(2019, 0, 20), "dd.MM.yyyy"); // output : "2019-01-20"
format(new Date(2019, 0, 20, 16, 34), "MM-dd-yyyy HH:mm"); // output : "01-20-2019 16:34"
format(new Date(2019, 0, 20, 16, 34), "MM-dd-yyyy hh:mm a"); // output : "01-20-2019 04:34 PM"
format(new Date(2019, 0, 20, 16, 34), "HH:mm MM-dd-yyyy"); // output : "16:34 01-20-2019"
format(new Date(2019, 0, 20, 16, 34, 23, 123), "MM-dd-yyyy HH:mm:ss.SSS"); // output : "01-20-2019 16:34:23.123"
format(new Date(2019, 0, 20), "'today:' yyyy-MM-dd"); // output : "today: 2019-01-20"

dayOfYear

Returns the number of the day in the year.

import { dayOfYear } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";

dayOfYear(new Date("2019-03-11T03:24:00")); // output: 70

weekOfYear

Returns the ISO week number of the provided date (1-53).

import { weekOfYear } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";

weekOfYear(new Date("2020-12-28T03:24:00")); // Returns 53