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Posted by "Chris Boget" on 08/02/05 02:14
> I'm sure something like this has already been written and I'd
> hate to redesign the wheel. I've searched google but came up
> empty and am wondering if any of you guys have what I am
> looking for.
I ended up writing my own. Hopefully to help anyone else out
trying to do the same thing, I've included my function below.
I used the following page as a guide
http://www.timeanddate.com/library/abbreviations/timezones/
function calculateTimeZoneDate( $dateTime, $fromTZ, $toTZ, $fromLocation =
'North America', $toLocation = 'GMT' ) {
$retval = $dateTime;
$timeStamp = strtotime( $dateTime );
$timeZonesArray = array( 'GMT' => array( 'GMT' => +0 // GMT
),
'North America' => array( 'NST' => -3.5, //
Newfoundland Standard Time
'NDT' => -2.5, //
Newfoundland Daylight Time
'AST' => -4, //
Atlantic Standard Time
'ADT' => -3, //
Atlantic Daylight Time
'EST' => -5, //
Eastern Standard Time
'EDT' => -4, //
Eastern Daylight Time
'CST' => -6, //
Central Standard Time
'CDT' => -5, //
Central Daylight Time
'MST' => -7, //
Central Daylight Time
'MDT' => -6, //
Mountain Daylight Time
'PST' => -8, //
Pacific Standard Time
'PDT' => -7, //
Pacific Daylight Time
'AKST' => -9, //
Alaska Standard Time
'AKDT' => -8, //
Alaska Daylight Time
'HAST' => -10, //
Hawaii-Aleutian Standard Time
'HADT' => -9 //
Hawaii-Aleutian Daylight Time
),
'Australia' => array( 'NFT' => +11.5, //
Norfolk (Island) Time
'EST' => +10, //
Eastern Standard Time
'EDT' => +11, //
Eastern Daylight Time
'CST' => +9.5, //
Central Standard Time
'CDT' => +10.5, //
Central Daylight Time
'WST' => +8, //
Western Standard Time
'CXT' => +7, //
Christmas Island Time
),
'Europe' => array( 'GMT' => +0, //
Greenwich Mean Time
'BST' => +1, //
British Summer Time
'IST' => +1, // Irish
Summer Time
'WET' => +0, //
Western European Time
'WEST' => +1, //
Western European Summer Time
'CET' => +1, //
Central European Time
'CEST' => +2, //
Central European Summer Time
'EET' => +2, //
Eastern European Time
'EEST' => +3 //
Eastern European Summer Time
),
'Military' => array( 'Z' => +0, // Zulu
Time Zone
'Y' => -12, // Yankee
Time Zone
'X' => -11, // X-ray
Time Zone
'W' => -10, // Whiskey
Time Zone
'V' => -9, // Victor
Time Zone
'U' => -8, // Uniform
Time Zone
'T' => -7, // Tango
Time Zone
'S' => -6, // Sierra
Time Zone
'R' => -5, // Romeo
Time Zone
'Q' => -4, // Quebec
Time Zone
'P' => -3, // Papa
Time Zone
'O' => -2, // Oscar
Time Zone
'N' => -1, // November
Time Zone
'A' => +1, // Alpha
Time Zone
'B' => +2, // Bravo
Time Zone
'C' => +3, // Charlie
Time Zone
'D' => +4, // Delta
Time Zone
'E' => +5, // Echo
Time Zone
'F' => +6, // Foxtrot
Time Zone
'G' => +7, // Golf
Time Zone
'H' => +8, // Hotel
Time Zone
'I' => +9, // India
Time Zone
'K' => +10, // Kilo
Time Zone
'L' => +11, // Lima
Time Zone
'M' => +12 // Mike
Time Zone
));
$fromGMTDiff = $timeZonesArray[$fromLocation][$fromTZ];
$toGMTDiff = $timeZonesArray[$toLocation][$toTZ];
if(( '' != trim( $fromGMTDiff )) && ( '' != trim( $toGMTDiff ))) {
if( $fromGMTDiff > $toGMTDiff ) {
$netDiff = $fromGMTDiff - $toGMTDiff;
} else {
$netDiff = $toGMTDiff - $fromGMTDiff;
}
$retval = date( 'Y-m-d h:i:sa', ( $timeStamp + ( 3600 * $netDiff )));
}
return $retval;
} // end function calculateTimeZoneDate()
As for daylight savings time, I'm leaving it up to the developer using the
above function to determing the appropriate TZ based on DST to pass
in. I didn't want to have to worry about what timezones actually use
DST. If anyone sees any gross mistakes, please let me know. Other-
wise, please feel free to use if needed.
thnx,
Chris
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