strftime

strftime for JavaScript

strftime

strftime for JavaScript. Works in (at least) node.js and browsers. Supports localization and timezones. Most standard specifiers from C are supported as well as some other extensions from Ruby.

Installation

node:

npm install strftime

bower:

bower install strftime

component:

component install samsonjs/strftime

Or you can copy strftime.js wherever you want to use it, whether that's with a <script> tag or require or anything else.

The New API in 0.9

The current version, 0.9, deprecates the older API that exported several functions: strftimeTZ, strftimeUTC, and localizedStrftime. In addition to this the exported function referenced itself as require('strftime').strftime or window.strftime.strftime for consistency with the other functions. These functions are deprecated in 0.9 and will be removed in 1.0.

Now you only need the single object exported and you can create a specialized version of it using the functions utc(), localize(locale), and timezone(offset). You can no longer pass in a timezone or locale on each call to strftime which is a regression. If you need this let me know and we will add it back into the API.

More details are available in the changelog.

Usage

    var strftime = require('strftime') // not required in browsers
    console.log(strftime('%B %d, %Y %H:%M:%S')) // => April 28, 2011 18:21:08
    console.log(strftime('%F %T', new Date(1307472705067))) // => 2011-06-07 18:51:45

If you want to localize it:

    var strftime = require('strftime') // not required in browsers
    var it_IT = {
        days: ['domenica', 'lunedi', 'martedi', 'mercoledi', 'giovedi', 'venerdi', 'sabato'],
        shortDays: ['dom', 'lun', 'mar', 'mer', 'gio', 'ven', 'sab'],
        months: ['gennaio', 'febbraio', 'marzo', 'aprile', 'maggio', 'giugno', 'luglio', 'agosto', 'settembre', 'ottobre', 'novembre', 'dicembre'],
        shortMonths: ['gen', 'feb', 'mar', 'apr', 'mag', 'giu', 'lug', 'ago', 'set', 'ott', 'nov', 'dic'],
        AM: 'AM',
        PM: 'PM',
        am: 'am',
        pm: 'pm',
        formats: {
            D: '%m/%d/%y',
            F: '%Y-%m-%d',
            R: '%H:%M',
            X: '%T',
            c: '%a %b %d %X %Y',
            r: '%I:%M:%S %p',
            T: '%H:%M:%S',
            v: '%e-%b-%Y',
            x: '%D'
        }
    }
    var strftimeIT = strftime.localize(it_IT)
    console.log(strftimeIT('%B %d, %Y %H:%M:%S')) // => aprile 28, 2011 18:21:08
    console.log(strftimeIT('%B %d, %Y %H:%M:%S', new Date(1307472705067))) // => giugno 7, 2011 18:51:45

Time zones can be passed in as an offset from GMT in minutes.

    var strftime = require('strftime') // not required in browsers
    var strftimePDT = strftime.timezone(-420)
    var strftimeCEST = strftime.timezone(120)
    console.log(strftimePDT('%B %d, %y %H:%M:%S', new Date(1307472705067))) // => June 07, 11 11:51:45
    console.log(strftimeCEST('%F %T', new Date(1307472705067))) // => 2011-06-07 20:51:45

Alternatively you can use the timezone format used by ISO 8601, +HHMM or -HHMM.

    var strftime = require('strftime') // not required in browsers
    var strftimePDT = strftime.timezone('-0700')
    var strftimeCEST = strftime.timezone('+0200')
    console.log(strftimePDT('', new Date(1307472705067))) // => June 07, 11 11:51:45
    console.log(strftimeCEST('%F %T', new Date(1307472705067))) // => 2011-06-07 20:51:45

Supported Specifiers

Extensions from Ruby are noted in the following list.

Unsupported specifiers are rendered without the percent sign. e.g. %q becomes q. Use %% to get a literal % sign.

  • A: full weekday name
  • a: abbreviated weekday name
  • B: full month name
  • b: abbreviated month name
  • C: AD century (year / 100), padded to 2 digits
  • c: equivalent to %a %b %d %X %Y in en-US (based on locale)
  • D: equivalent to %m/%d/%y in en-US (based on locale)
  • d: day of the month, padded to 2 digits (01-31)
  • e: day of the month, padded with a leading space for single digit values (1-31)
  • F: equivalent to %Y-%m-%d in en-US (based on locale)
  • H: the hour (24-hour clock), padded to 2 digits (00-23)
  • h: the same as %b (abbreviated month name)
  • I: the hour (12-hour clock), padded to 2 digits (01-12)
  • j: day of the year, padded to 3 digits (001-366)
  • k: the hour (24-hour clock), padded with a leading space for single digit values (0-23)
  • L: the milliseconds, padded to 3 digits [Ruby extension]
  • l: the hour (12-hour clock), padded with a leading space for single digit values (1-12)
  • M: the minute, padded to 2 digits (00-59)
  • m: the month, padded to 2 digits (01-12)
  • n: newline character
  • o: day of the month as an ordinal (without padding), e.g. 1st, 2nd, 3rd, 4th, ...
  • P: "am" or "pm" in lowercase (Ruby extension, based on locale)
  • p: "AM" or "PM" (based on locale)
  • R: equivalent to %H:%M in en-US (based on locale)
  • r: equivalent to %I:%M:%S %p in en-US (based on locale)
  • S: the second, padded to 2 digits (00-60)
  • s: the number of seconds since the Epoch, UTC
  • T: equivalent to %H:%M:%S in en-US (based on locale)
  • t: tab character
  • U: week number of the year, Sunday as the first day of the week, padded to 2 digits (00-53)
  • u: the weekday, Monday as the first day of the week (1-7)
  • v: equivalent to %e-%b-%Y in en-US (based on locale)
  • W: week number of the year, Monday as the first day of the week, padded to 2 digits (00-53)
  • w: the weekday, Sunday as the first day of the week (0-6)
  • X: equivalent to %D in en-US (based on locale)
  • x: equivalent to %T in en-US (based on locale)
  • Y: the year with the century
  • y: the year without the century (00-99)
  • Z: the time zone name, replaced with an empty string if it is not found
  • z: the time zone offset from UTC, with a leading plus sign for UTC and zones east of UTC and a minus sign for those west of UTC, hours and minutes follow each padded to 2 digits and with no delimiter between them

For more detail see man 3 strftime as the format specifiers should behave identically. If behaviour differs please file a bug.

Any specifier can be modified with -, _, 0, or : as well, as in Ruby. Using %- will omit any leading zeroes or spaces, %_ will force spaces for padding instead of the default, and %0 will force zeroes for padding. There's some redundancy here as %-d and %e have the same result, but it solves some awkwardness with formats like %l. Using %: for time zone offset, as in %:z will insert a colon as a delimiter.

Contributors

License

Copyright 2010 - 2015 Sami Samhuri sami@samhuri.net

MIT license