@version    17.7.0
@date       2017-07-14
@stability  2 - Unstable

Date format –

A small library for parsing and formatting dates that extends native Date object.

Install

npm install date-format-lite --save

require("date-format-lite")

Format Dates

date-format-lite adds format(mask, [zone]) method to native Date.prototype.

mask String - Output format, e.g. hh:mm:ss.
zone Number, optional - UTC offset in hours, e.g. -6.5.

var now = new Date()          // Date {Wed Jul 10 2013 16:47:36 GMT+0300 (EEST)}
now.format("iso")             // 2013-07-10T13:47:36Z
now.format("hh:mm")           // 16:47 (local time)
now.format("UTC:hh:mm")       // 13:47
now.format("hh:mm", 2.5)      // 16:17

Mutate Dates

date-format-lite adds add(amount, [unit]) method to native Date.prototype.

amount Number - Time to add, negative number will be subtracted.
unit String, optional - e.g. seconds, minutes, hours, days, weeks, months, years.

now.format("iso")                     // 2013-07-10T13:47:36Z
now.add(1, "days").format("iso")      // 2013-07-11T13:47:36Z
now.add(-2, "hours").format("iso")    // 2013-07-11T11:47:36Z

Parse Dates

date-format-lite adds date([outFormat], [outZone], [inZone]) method to native String.prototype and Number.prototype.

outFormat String, optional - Output format, e.g. hh:mm:ss. Returns date object when format not specified.
outZone Number, optional - UTC offset for output in hours, e.g. -6.5.
inZone Number, optional - UTC offset in input in hours, e.g. -6.5.

"2013-07-10".date()           // Date {Wed Jul 10 2013 03:00:00 GMT+0300 (EEST)}
"2013-07-10T13:47:36Z".date() // Date {Wed Jul 10 2013 16:47:36 GMT+0300 (EEST)}
"10/07/2013".date()           // Date {Wed Jul 10 2013 03:00:00 GMT+0300 (EEST)}
Date.middleEndian = true
"10/07/2013".date()           // Date {Mon Oct 07 2013 03:00:00 GMT+0300 (EEST)}
// Change format
"10/07/2013".date("YYYY-MM-DD")// 2013-07-10

Add custom formats

Date.masks.my = '"DayNo "D'
now.format("my")              // DayNo 10

Change default format

Date.masks.default = 'YYYY-MM-DD hh:mm:ss'
now.format()         // 2013-07-10 13:47:36

Change language

// Add to estonian-lang.js
Date.names = "Jaan Veeb Märts Apr Mai Juuni Juuli Aug Sept Okt Nov Dets jaanuar veebruar märts aprill mai juuni juuli august september oktoober november detsember P E T K N R L pühapäev esmaspäev teisipäev kolmapäev neljapäev reede laupäev".split(" ")

// Change AM and PM
Date.am = "a.m."
Date.pm = "p.m."

See tests for more examples

Syntax

Y - A two digit representation of a year without leading zeros. Examples: 99 or 3
YY - A two digit representation of a year. Examples: 99 or 03
YYYY - A full numeric representation of a year, 4 digits. Examples: 1999 or 2003
M - Numeric representation of a month, without leading zeros. 1 through 12
MM - Numeric representation of a month, with leading zeros. 01 through 12
MMM - A short textual representation of a month, three letters. Jan through Dec
MMMM - A full textual representation of a month, such as January or March. January through December
D - Day of the month without leading zeros. 1 to 31
DD - Day of the month, 2 digits with leading zeros. 01 to 31
DDD - A textual representation of a day, three letters. Mon through Sun
DDDD - A full textual representation of the day of the week. Sunday through Saturday
H - 12-hour format of an hour without leading zeros. 1 through 12
HH - 12-hour format of an hour with leading zeros. 01 through 12
h - 24-hour format of an hour without leading zeros. 0 through 23
hh - 24-hour format of an hour with leading zeros. 00 through 23
m - Minutes without leading zeros. 0 through 59
mm - Minutes with leading zeros. 00 to 59
s - Seconds without leading zeros. 0 through 59
ss - Seconds with leading zeros. 00 to 59
S - Milliseconds without leading zeros. 0 through 999
SS - Milliseconds with leading zeros. 000 to 999
U - Milliseconds since the Unix Epoch (January 1 1970 00:00:00 GMT)
u - Seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)
A - Ante meridiem and Post meridiem. AM or PM
"text" - text, quotes should be escaped, eg '"a \"quoted text\"" YYYY'

Time zone designators

Z - Time offsets from UTC in the form ±hh[:mm] Examples: +02, +02:30
ZZ - Time offsets from UTC in the form ±hh[mm] Examples: +02, +0230
ZZZ - Time offsets from UTC in the form ±hh:mm Examples: +02:00, +02:30
ZZZZ - Time offsets from UTC in the form ±hhmm Examples: +0200, +0230

ISO-8601

w - Day of the week. 1 (for Monday) through 7 (for Sunday)
W - Week number of year, first week is the week with 4 January in it
o - ISO-8601 year number. This has the same value as YYYY, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead

Notes

If no UTC relation information is given with a time representation, the time is assumed to be in local time.
If the time is in UTC, add a Z directly after the time without a space.

zgrolink/date-format-lite