Prototype ¬ Detail

author: iv [+], Submitted: 02.13.07 10a

class org.dembicki.utils.DateUtils {

 public static function isSummerTime (date:Date):Boolean {

  var marth_last_sunday:Date = new Date(date.getFullYear(), 2, 1);
  var october_last_sunday:Date = new Date(date.getFullYear(), 9, 1);

  marth_last_sunday = getLastSunday(marth_last_sunday);
  october_last_sunday = getLastSunday(october_last_sunday);

  marth_last_sunday.setHours(2);
  october_last_sunday.setHours(3);

  var marth_time:Number = marth_last_sunday.getTime();
  var october_time:Number = october_last_sunday.getTime();
  var date_time:Number = date.getTime();

  return (date_time > marth_time) && (date_time < october_time);
 }

 private static function getLastSunday(date:Date):Date {
  var last_sunday:Date = new Date(date.getFullYear(), date.getMonth()+1, 1);
  last_sunday.setDate(1-last_sunday.getDay());
  return last_sunday;
 }
}

usage

import org.dembicki.utils.DateUtils;

var moscow_offset:Number = 3;
var now_in_moscow:Date = new Date();
now_in_moscow.setHours(now_in_moscow.getUTCHours()+moscow_offset);
if (DateUtils.isSummerTime(now_in_moscow)) {
  now_in_moscow.setHours(now_in_moscow.getHours()+1);
}

trace("moscow_time: " +now_in_moscow.getHours()+":" +now_in_moscow.getMinutes());