DateTime Formatting

DateTime values are expected to be in the ISO 8601 format, for example '2013-02-14T13:15:03-08:00' (YYYY-MM-DDTHH:mm:ssZ).

Below are examples for generating ISO 8601 datetime strings in a few popular programing languages.

Java

  Date 
  
 date 
  
 = 
  
 new 
  
 Date 
 (); 
 DateFormat 
  
 df 
  
 = 
  
 new 
  
 SimpleDateFormat 
 ( 
 "yyyy-MM-dd'T'HH:mm:ssZ" 
 ); 
 String 
  
 dateAsISOString 
  
 = 
  
 df 
 . 
 format 
 ( 
 date 
 );

JavaScript

  var 
  
 d 
  
 = 
  
 new 
  
 Date 
 (); 
 var 
  
 date 
  
 = 
  
 d 
 . 
 toISOString 
 ();

PHP

  $objDateTime = new DateTime('NOW'); 
 $isoDate = $objDateTime->format(DateTime::ISO8601);

Python

  from 
  
 datetime 
  
 import 
 date 
 d 
 = 
 date 
 . 
 now 
 () 
 date 
 = 
 d 
 . 
 isoformat 
 ()

Ruby

  require 
  
 'time' 
 d 
  
 = 
  
 Time 
 . 
 now 
 date 
  
 = 
  
 d 
 . 
 utc 
 . 
 iso8601

Perl

  my 
  
 $now 
  
 = 
  
 time 
 (); 
 $date 
  
 = 
  
 time2isoz 
 ( 
 $now 
 );

C++

  time_t 
  
 now 
 ; 
 time 
 ( 
& now 
 ); 
 char 
  
 buf 
 [ 
 sizeof 
  
 "2011-10-08T07:07:09Z" 
 ]; 
 strftime 
 ( 
 buf 
 , 
  
 sizeof 
  
 buf 
 , 
  
 "%FT%TZ" 
 , 
  
 gmtime 
 ( 
& now 
 ));

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Last updated 2025-03-24 UTC.