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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