drupal/misc/timezone.js

// $Id: timezone.js,v 1.6 2009/04/27 20:19:35 webchick Exp $
(function ($) {

/**
 * Set the client's system time zone as default values of form fields.
 */
Drupal.behaviors.setTimezone = {
  attach: function (context, settings) {
    $('select.timezone-detect', context).once('timezone', function () {
      var dateString = Date();
      // In some client environments, date strings include a time zone
      // abbreviation, between 3 and 5 letters enclosed in parentheses,
      // which can be interpreted by PHP.
      var matches = dateString.match(/\(([A-Z]{3,5})\)/);
      var abbreviation = matches ? matches[1] : 0;

      // For all other client environments, the abbreviation is set to "0"
      // and the current offset from UTC and daylight saving time status are
      // used to guess the time zone.
      var dateNow = new Date();
      var offsetNow = dateNow.getTimezoneOffset() * -60;

      // Use January 1 and July 1 as test dates for determining daylight
      // saving time status by comparing their offsets.
      var dateJan = new Date(dateNow.getFullYear(), 0, 1, 12, 0, 0, 0);
      var dateJul = new Date(dateNow.getFullYear(), 6, 1, 12, 0, 0, 0);
      var offsetJan = dateJan.getTimezoneOffset() * -60;
      var offsetJul = dateJul.getTimezoneOffset() * -60;

      var isDaylightSavingTime;
      // If the offset from UTC is identical on January 1 and July 1,
      // assume daylight saving time is not used in this time zone.
      if (offsetJan == offsetJul) {
        isDaylightSavingTime = '';
      }
      // If the maximum annual offset is equivalent to the current offset,
      // assume daylight saving time is in effect.
      else if (Math.max(offsetJan, offsetJul) == offsetNow) {
        isDaylightSavingTime = 1;
      }
      // Otherwise, assume daylight saving time is not in effect.
      else {
        isDaylightSavingTime = 0;
      }

      // Submit request to the system/timezone callback and set the form field
      // to the response time zone. The client date is passed to the callback
      // for debugging purposes. Submit a synchronous request to avoid database
      // errors associated with concurrent requests during install.
      var path = 'system/timezone/' + abbreviation + '/' + offsetNow + '/' + isDaylightSavingTime;
      var element = this;
      $.ajax({
        async: false,
        url: settings.basePath,
        data: { q: path, date: dateString },
        dataType: 'json',
        success: function (data) {
          if (data) {
            $(element).val(data);
          }
        }
      });
    });
  }
};

})(jQuery);
1	// $Id: timezone.js,v 1.6 2009/04/27 20:19:35 webchick Exp $
2	(function ($) {
3
4	/**
5	* Set the client's system time zone as default values of form fields.
6	*/
7	Drupal.behaviors.setTimezone = {
8	attach: function (context, settings) {
9	$('select.timezone-detect', context).once('timezone', function () {
10	var dateString = Date();
11	// In some client environments, date strings include a time zone
12	// abbreviation, between 3 and 5 letters enclosed in parentheses,
13	// which can be interpreted by PHP.
14	var matches = dateString.match(/\(([A-Z]{3,5})\)/);
15	var abbreviation = matches ? matches[1] : 0;
16
17	// For all other client environments, the abbreviation is set to "0"
18	// and the current offset from UTC and daylight saving time status are
19	// used to guess the time zone.
20	var dateNow = new Date();
21	var offsetNow = dateNow.getTimezoneOffset() * -60;
22
23	// Use January 1 and July 1 as test dates for determining daylight
24	// saving time status by comparing their offsets.
25	var dateJan = new Date(dateNow.getFullYear(), 0, 1, 12, 0, 0, 0);
26	var dateJul = new Date(dateNow.getFullYear(), 6, 1, 12, 0, 0, 0);
27	var offsetJan = dateJan.getTimezoneOffset() * -60;
28	var offsetJul = dateJul.getTimezoneOffset() * -60;
29
30	var isDaylightSavingTime;
31	// If the offset from UTC is identical on January 1 and July 1,
32	// assume daylight saving time is not used in this time zone.
33	if (offsetJan == offsetJul) {
34	isDaylightSavingTime = '';
35	}
36	// If the maximum annual offset is equivalent to the current offset,
37	// assume daylight saving time is in effect.
38	else if (Math.max(offsetJan, offsetJul) == offsetNow) {
39	isDaylightSavingTime = 1;
40	}
41	// Otherwise, assume daylight saving time is not in effect.
42	else {
43	isDaylightSavingTime = 0;
44	}
45
46	// Submit request to the system/timezone callback and set the form field
47	// to the response time zone. The client date is passed to the callback
48	// for debugging purposes. Submit a synchronous request to avoid database
49	// errors associated with concurrent requests during install.
50	var path = 'system/timezone/' + abbreviation + '/' + offsetNow + '/' + isDaylightSavingTime;
51	var element = this;
52	$.ajax({
53	async: false,
54	url: settings.basePath,
55	data: { q: path, date: dateString },
56	dataType: 'json',
57	success: function (data) {
58	if (data) {
59	$(element).val(data);
60	}
61	}
62	});
63	});
64	}
65	};
66
67	})(jQuery);