/**
* 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() == $pm_tz->getSummerTimeEndTime()) {
return true;
} else {
return false;
}
}
function calc_timezone($newdate)
{
global $pref;
if (!$pref['datetime'] || !$this->TimeZone) {
$newdate = preg_replace('/UT$/', 'UTC', $newdate);
$newdate = date("D, j M Y G:i O", strtotime($newdate));
return $newdate;
}
require_once 'Date.php';
// convert to ISO 8601 format
if (preg_match('/(\\d+) ([a-z]+) (\\d\\d\\d?\\d?) (\\d\\d:\\d\\d:\\d\\d) ((\\+|-)\\d\\d\\d\\d|[a-z]+)/i', $newdate, $m)) {
if (strlen($m[1]) == 1) {
$m[1] = "0{$m['1']}";
}
// If a 2 digit date is given then we need to make an assumption
// about the actual year. If year >= 80 we can safely assume that
// it's a 20th Century date e.g. 89 becomes 1989. Otherwise lets make it
// a 21st Century date, e.g. 08 becomes 2008
if (strlen($m[3]) == 2) {
$m[3] = $m[3] >= 80 ? "19{$m['3']}" : "20{$m['3']}";
}
// format month name with uppercase firt char e.g Sep
$m[2] = ucfirst(strtolower($m[2]));
// Convert Timezone ID to GMT offset
if (!is_numeric($m[5])) {
// convert UT > UTC
if ($m[5] == 'UT') {
$m[5] = 'UTC';
}
$dt = new Date_TimeZone($m[5]);
$m[5] = $dt->getRawOffset();
if ($m[5] == 0) {
$m[5] = 'Z';
} else {
$m[5] = $m[5] / 36000;
settype($m[5], 'string');
$m[5] = preg_replace('/(-|\\+)/', '${1}0', $m[5]);
}
}
$newdate = "{$m['3']}{$this->months[$m[2]]}{$m['1']}T{$m['4']}{$m['5']}";
// Do timezone conversion
$date = new Date($newdate);
$date->convertTZbyID($this->TimeZone);
$newdate = $date->getDate();
$newdate = date("D, j M Y G:i O", strtotime($newdate));
} elseif (preg_match('/(\\d+) ([a-z]+) (\\d\\d\\d\\d) (\\d\\d:\\d\\d:\\d\\d) (\\w+)/i', $newdate, $m)) {
if (strlen($m[1]) == 1) {
$m[1] = "0{$m['1']}";
}
// If a 2 digit date is given then we need to make an assumption
// about the actual year. If year >= 80 we can safely assume that
// it's a 20th Century date e.g. 89 becomes 1989. Otherwise lets make it
// a 21st Century date, e.g. 08 becomes 2008
if (strlen($m[3]) == 2) {
$m[3] = $m[3] >= 80 ? "19{$m['3']}" : "20{$m['3']}";
}
// format month name with uppercase firt char e.g Sep
$m[2] = ucfirst(strtolower($m[2]));
$newdate = "{$m['3']}{$this->months[$m[2]]}{$m['1']}";
// Convert date from timezone ID, rather than +0900 or -1100 format, format in GMT, MST, etc
$date = new Date($newdate);
$date->setTZByID($m[5]);
$newdate = $date->getDate();
$newdate = date("D, j M Y G:i O", strtotime($newdate));
} else {
$newdate = date("D, j M Y G:i O", strtotime($newdate));
}
return $newdate;
}
