/**
* Is this time zone equivalent to another
*
* Tests to see if this time zone is equivalent to a given time zone object.
* Equivalence in this context consists in the two time zones having:
*
* an equal offset from UTC in both standard and Summer time (if
* the time zones observe Summer time)
* the same Summer time start and end rules, that is, the two time zones
* must switch from standard time to Summer time, and vice versa, on the
* same day and at the same time
*
* @param object $pm_tz the Date_TimeZone object to test, or a valid time
* zone ID
*
* @return bool true if this time zone is equivalent to the supplied
* time zone
* @access public
*/
function isEquivalent($pm_tz)
{
if (is_a($pm_tz, "Date_TimeZone")) {
if ($pm_tz->getID() == $this->id) {
return true;
}
} else {
if (!Date_TimeZone::isValidID($pm_tz)) {
return PEAR::raiseError("Invalid time zone ID '{$pm_tz}'", DATE_ERROR_INVALIDTIMEZONE);
}
if ($pm_tz == $this->id) {
return true;
}
$pm_tz = new Date_TimeZone($pm_tz);
}
if ($this->getRawOffset() == $pm_tz->getRawOffset() && $this->hasDaylightTime() == $pm_tz->hasDaylightTime() && $this->getDSTSavings() == $pm_tz->getDSTSavings() && $this->getSummerTimeStartMonth() == $pm_tz->getSummerTimeStartMonth() && $this->getSummerTimeStartDay() == $pm_tz->getSummerTimeStartDay() && $this->getSummerTimeStartTime() == $pm_tz->getSummerTimeStartTime() && $this->getSummerTimeEndMonth() == $pm_tz->getSummerTimeEndMonth() && $this->getSummerTimeEndDay() == $pm_tz->getSummerTimeEndDay() && $this->getSummerTimeEndTime() == $pm_tz->getSummerTimeEndTime()) {
return true;
} else {
return false;
}
}
