---
layout: page
title: "JavaScript date_default_timezone_set function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/date_default_timezone_set:584
- /functions/view/date_default_timezone_set
- /functions/view/584
- /functions/date_default_timezone_set:584
- /functions/584
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's date_default_timezone_set

{% codeblock datetime/date_default_timezone_set.js lang:js https://raw.github.com/kvz/phpjs/master/functions/datetime/date_default_timezone_set.js raw on github %}
function date_default_timezone_set (tz) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // -    depends on: timezone_abbreviations_list
  // %        note 1: Uses global: php_js to store the default timezone
  // *     example 1: date_default_timezone_set('unknown');
  // *     returns 1: 'unknown'
  var tal = {},
    abbr = '',
    i = 0;

  // BEGIN REDUNDANT
  this.php_js = this.php_js || {};
  // END REDUNDANT
  // PHP verifies that the timezone is valid and also sets this.php_js.currentTimezoneOffset and this.php_js.currentTimezoneDST if so
  tal = this.timezone_abbreviations_list();
  for (abbr in tal) {
    for (i = 0; i < tal[abbr].length; i++) {
      if (tal[abbr][i].timezone_id === tz) {
        this.php_js.default_timezone = tz;
        return true;
      }
    }
  }
  return false;
}
{% endcodeblock %}

 - [view on github](https://github.com/kvz/phpjs/blob/master/functions/datetime/date_default_timezone_set.js)
 - [edit on github](https://github.com/kvz/phpjs/edit/master/functions/datetime/date_default_timezone_set.js)

### Example 1
This code
{% codeblock lang:js example %}
date_default_timezone_set('unknown');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
'unknown'
{% endcodeblock %}


### Other PHP functions in the datetime extension
{% render_partial _includes/custom/datetime.html %}