Time-zones...

[Aureole]

Does anyone know of any short and sweet (simple) little functions that accept two parameters: a time-zone and a timestamp and will change the time-zone according to the timestamp.

 

E.g.

 

My server time is EST, my time-zone is GMT.

 

<?php
doFunkyStuffWithTimestamp('GMT', '1201341865');
?>

 

Which would return the time in GMT relative to server-time.

 

I could write one myself but I bet people have needed similar functions a million times before and no doubt someone has already written one.

[Daniel0]

How about gmdate()?

[Aureole]

Never heard of it, I'll go look it up on PHP.net... ???

[Aureole]

I just quickly slapped this together:

 

<?php
function timezone( $timezone, $timestamp )
{
global $output;
$timestamp = intval($timestamp);

switch( $timezone )
{
	// (GMT - 12 Hours) Enitwetok, Kwajalien
	case '-12';
	$output = $timestamp - 25200;
	break;

	// (GMT - 11 Hours) Midway Island, Samoa
	case '-11';
	$output = $timestamp - 21600;
	break;

	// (GMT - 10 Hours) Hawaii
	case '-10';
	$output = $timestamp - 18000;
	break;

	// (GMT - 9.5 Hours) French Polynesia
	case '-9.5';
	$output = $timestamp - 16200;
	break;

	// (GMT - 9 Hours) Alaska
	case '-9';
	$output = $timestamp - 14400;
	break;

	// (GMT - 8 Hours) Pacific Time (US & Canada)
	case '-8';
	$output = $timestamp - 10800;
	break;

	// (GMT - 7 Hours) Mountain Time (US & Canada)
	case '-7';
	$output = $timestamp - 7200;
	break;

	// (GMT - 6 Hours) Central Time (US & Canada), Mexico City
	case '-6';
	$output = $timestamp - 3600;
	break;

	// (GMT - 5 Hours) Eastern Time (US & Canada), Bogota, Lima
	case '-5';
	$output = $timestamp;
	break;

	// (GMT - 4 Hours) Atlantic Time (Canada), Caracas, La Paz
	case '-4';
	$output = $timestamp + 3600;
	break;

	// (GMT - 3.5 Hours) Newfoundland
	case '-3.5';
	$output = $timestamp + 5400;
	break;

	// (GMT - 3 Hours) Brazil, Buenos Aires, Falkland Is.
	case '-3';
	$output = $timestamp + 7200;
	break;

	// (GMT - 2 Hours) Mid-Atlantic, Ascention Is., St Helena
	case '-2';
	$output = $timestamp + 10800;
	break;

	// (GMT - 1 Hour) Azores, Cape Verde Islands
	case '-1';
	$output = $timestamp + 14400;
	break;

	// (GMT) Casablanca, Dublin, London, Lisbon, Monrovia
	case '0';
	$output = $timestamp + 18000;
	break;

	// (GMT + 1 Hour) Brussels, Copenhagen, Madrid, Paris
	case '1';
	$output = $timestamp + 21600;
	break;

	// (GMT + 2 Hours) Kaliningrad, South Africa
	case '2';
	$output = $timestamp + 25200;
	break;

	// (GMT + 3 Hours) Baghdad, Riyadh, Moscow, Nairobi
	case '3';
	$output = $timestamp + 28800;
	break;

	// (GMT + 3.5 Hours) Tehran
	case '3.5';
	$output = $timestamp + 30600;
	break;

	// (GMT + 4 Hours) Abu Dhabi, Baku, Muscat, Tbilisi
	case '4';
	$output = $timestamp + 32400;
	break;

	// (GMT + 4.5 Hours) Kabul
	case '4.5';
	$output = $timestamp + 34200;
	break;

	// (GMT + 5 Hours) Ekaterinburg, Karachi, Tashkent
	case '5';
	$output = $timestamp + 36000;
	break;

	// (GMT + 5.5 Hours) Bombay, Calcutta, Madras, New Delhi
	case '5.5';
	$output = $timestamp + 37800;
	break;

	// (GMT + 5.75 Hours) Kathmandu
	case '5.75';
	$output = $timestamp + 38700;
	break;

	// (GMT + 6 Hours) Almaty, Colombo, Dhaka
	case '6';
	$output = $timestamp + 39600;
	break;

	// (GMT + 6.5 Hours) Yangon, Naypyidaw, Bantam
	case '6.5';
	$output = $timestamp + 41400;
	break;

	// (GMT + 7 Hours) Bangkok, Hanoi, Jakarta
	case '7';
	$output = $timestamp + 43200;
	break;

	// (GMT + 8 Hours) Hong Kong, Perth, Singapore, Taipei
	case '8';
	$output = $timestamp + 46800;
	break;

	// (GMT + 8.75 Hours) Caiguna, Eucla
	case '8.75';
	$output = $timestamp + 49500;
	break;

	// (GMT + 9 Hours) Osaka, Sapporo, Seoul, Tokyo, Yakutsk
	case '9';
	$output = $timestamp + 50400;
	break;

	// (GMT + 9.5 Hours) Adelaide, Darwin
	case '9.5';
	$output = $timestamp + 52200;
	break;

	// (GMT + 10 Hours) Melbourne, Papua New Guinea, Sydney
	case '10';
	$output = $timestamp + 54000;
	break;

	// (GMT + 10.5 Hours) Lord Howe Island
	case '10.5';
	$output = $timestamp + 55800;
	break;

	// (GMT + 11 Hours) Magadan, New Caledonia, Solomon Is.
	case '11';
	$output = $timestamp + 57600;
	break;

	// (GMT + 11.5 Hours) Burnt Pine, Kingston
	case '11.5';
	$output = $timestamp + 59400;
	break;

	// (GMT + 12 Hours) Auckland, Fiji, Marshall Island
	case '12';
	$output = $timestamp + 61200;
	break;

	// (GMT + 12.75 Hours) Chatham Islands
	case '12.75';
	$output = $timestamp + 63900;
	break;

	// (GMT + 13 Hours) Kamchatka, Anadyr
	case '13';
	$output = $timestamp + 64800;
	break;

	// (GMT + 14 Hours) Kiritimati
	case '14';
	$output = $timestamp + 68400;
	break;
}
return $output;
}
?>

 

I'm just wondering about Daylight Savings, I never really understood them.