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strftime()

A JavaScript port of strftime(), a function to format the date and time.

Supported conversion specifications:

Sequence Description Example
%a Abbreviated name of the day of the week. Fri
%A Full name of the day of the week. Friday
%b Abbreviated month name. Apr
%B Full month name. April
%c UTC date and time representation for the current locale. Sat 02 Apr 2022 00:15:00 GMT
%C Century number (year/100) as a 2-digit integer. 20
%d Day of the month as a decimal number (range 01 to 31). 01
%e Day of the month as a decimal number (range 1 to 31). 1
%F ISO 8601 date format (equivalent to %Y-%m-%d). 2022-04-01
%g Like %G, but without century, that is, with a 2-digit year. 22
%G ISO 8601 week-based year with century as a decimal number. The 4-digit year corresponds to the ISO week number (see %V). This has the same format and value as %Y, except that if the ISO week number belongs to the previous or next year, that year is used instead. 2022
%H Hour as a decimal number using a 24-hour clock (range 00 to 23). See also %k. 17
%I Hour as a decimal number using a 12-hour clock (range 01 to 12). See also %l. 05
%j Day of the year as a decimal number (range 001 to 366). 091
%k Hour as a decimal number using a 24-hour clock (range 0 to 23). See also %H. 17
%l Hour as a decimal number using a 12-hour clock (range 1 to 12). See also %I. 5
%m Month as a decimal number (range 01 to 12). 04
%n Month as a decimal number (range 1 to 12). 4
%M Minute as a decimal number (range 00 to 59). 15
%p Either "AM" or "PM" according to the given time value. Noon is treated as "PM" and midnight as "AM". PM
%P Like %p but in lowercase ("am" or "pm"). pm
%s Number of seconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC). 1648858500
%S Second as a decimal number (range 00 to 59). 00
%u Day of the week as a decimal (range 1 to 7), Monday being 1. See also %w. 5
%V ISO 8601 week number of the current year as a decimal number (range 01 to 53), where week 1 is the first week that has at least 4 days in the new year (that is, the first Thursday). 13
%w Day of the week as a decimal (range 0 to 6), Sunday being 0. See also %u. 5
%x Preferred date representation for the current locale without the time. 4/1/2022
%X Preferred time representation for the current locale without the date. 5:15:00 PM
%y Year as a decimal number without a century (range 00 to 99). 22
%Y Year as a decimal number including the century. 2022
%z The +hhmm or -hhmm numeric timezone (that is, the hour and minute offset from UTC). -0800
%Z Timezone name. Pacific Standard Time
%Zs Timezone short name (abbreviation). PST

Compatibility notes:

  • %c - formatted string is slightly different
  • %D - not implemented (use %m/%d/%y or %d/%m/%y)
  • %e - space is not added
  • %E - not implemented
  • %h - not implemented (use %b)
  • %k - space is not added
  • %n - like %m, but no leading zero (use \n for newline)
  • %O - not implemented
  • %r - not implemented (use %I:%M:%S %p)
  • %R - not implemented (use %H:%M)
  • %t - not implemented (use \t)
  • %T - not implemented (use %H:%M:%S)
  • %U - not implemented
  • %W - not implemented
  • %+ - not implemented
  • %% - not implemented (use %)

Sample usage:

// Returns "15-09-2016 16:20"
strftime('%d-%m-%Y %H:%M');

// You can optionally pass it a Date object
// Returns "01-01-2016 21:30"
strftime('%d-%m-%Y %H:%M', new Date('Jan 1, 2016 9:30 PM'));