php获取当地时间 time zone
PHP5.2.4之前的版本无需设置时区。下面是修改PHP时区的三个办法。
1、修改PHP.ini这个文件
找到date.timezone这行，去掉前面的分号，改成：
date.timezone = Asia/Shanghai
2、修改 .htaccess文件
修改.htaccess文件有两种办法，下面的两条语句只要有一条即可
php_value date.timezone Asia/Shanghai SetEnv TZ Asia/Shanghai
3、修改PHP代码
也是下面的两条语句只要其中的一句即可
date_default_timezone_set('Asia/Shanghai');
ini_set('date.timezone','Asia/Shanghai');
例如： <?php date_default_timezone_set('Asia/Shanghai'); ?>
<?php
include('tz.php');
echo get_localtime(time(),'Asia/Hong_Kong'); // local time
//get_alltime(time()); // global time
?>
具体见附件；
例外，也收集了一些有关时区的动动；
1. PHP TimeZone Array
<?php $timezoneTable = array( "-12" => "(GMT -12:00) Eniwetok, Kwajalein", "-11" => "(GMT -11:00) Midway Island, Samoa", "-10" => "(GMT -10:00) Hawaii", "-9" => "(GMT -9:00) Alaska", "-8" => "(GMT -8:00) Pacific Time (US & Canada)", "-7" => "(GMT -7:00) Mountain Time (US & Canada)", "-6" => "(GMT -6:00) Central Time (US & Canada), Mexico City", "-5" => "(GMT -5:00) Eastern Time (US & Canada), Bogota, Lima", "-4" => "(GMT -4:00) Atlantic Time (Canada), Caracas, La Paz", "-3.5" => "(GMT -3:30) Newfoundland", "-3" => "(GMT -3:00) Brazil, Buenos Aires, Georgetown", "-2" => "(GMT -2:00) Mid-Atlantic", "-1" => "(GMT -1:00 hour) Azores, Cape Verde Islands", "0" => "(GMT) Western Europe Time, London, Lisbon, Casablanca", "1" => "(GMT +1:00 hour) Brussels, Copenhagen, Madrid, Paris", "2" => "(GMT +2:00) Kaliningrad, South Africa", "3" => "(GMT +3:00) Baghdad, Riyadh, Moscow, St. Petersburg", "3.5" => "(GMT +3:30) Tehran", "4" => "(GMT +4:00) Abu Dhabi, Muscat, Baku, Tbilisi", "4.5" => "(GMT +4:30) Kabul", "5" => "(GMT +5:00) Ekaterinburg, Islamabad, Karachi, Tashkent", "5.5" => "(GMT +5:30) Bombay, Calcutta, Madras, New Delhi", "6" => "(GMT +6:00) Almaty, Dhaka, Colombo", "7" => "(GMT +7:00) Bangkok, Hanoi, Jakarta", "8" => "(GMT +8:00) Beijing, Perth, Singapore, Hong Kong", "9" => "(GMT +9:00) Tokyo, Seoul, Osaka, Sapporo, Yakutsk", "9.5" => "(GMT +9:30) Adelaide, Darwin", "10" => "(GMT +10:00) Eastern Australia, Guam, Vladivostok", "11" => "(GMT +11:00) Magadan, Solomon Islands, New Caledonia", "12" => "(GMT +12:00) Auckland, Wellington, Fiji, Kamchatka" );
$timezones = array(
'-12'=>'Pacific/Kwajalein',
'-11'=>'Pacific/Samoa',
'-10'=>'Pacific/Honolulu',
'-9'=>'America/Juneau',
'-8'=>'America/Los_Angeles',
'-7'=>'America/Denver',
'-6'=>'America/Mexico_City',
'-5'=>'America/New_York',
'-4'=>'America/Caracas',
'-3.5'=>'America/St_Johns',
'-3'=>'America/Argentina/Buenos_Aires',
'-2'=>'Atlantic/Azores',// no cities here so just picking an hour ahead
'-1'=>'Atlantic/Azores',
'0'=>'Europe/London',
'1'=>'Europe/Paris',
'2'=>'Europe/Helsinki',
'3'=>'Europe/Moscow',
'3.5'=>'Asia/Tehran',
'4'=>'Asia/Baku',
'4.5'=>'Asia/Kabul',
'5'=>'Asia/Karachi',
'5.5'=>'Asia/Calcutta',
'6'=>'Asia/Colombo',
'7'=>'Asia/Bangkok',
'8'=>'Asia/Singapore',
'9'=>'Asia/Tokyo',
'9.5'=>'Australia/Darwin',
'10'=>'Pacific/Guam',
'11'=>'Asia/Magadan',
'12'=>'Asia/Kamchatka'
);
$zones = array(
"Pacific/Midway" => "(GMT-11:00) Midway Island, Samoa",
"America/Adak" => "(GMT-10:00) Hawaii-Aleutian",
"Etc/GMT+10" => "(GMT-10:00) Hawaii",
"Pacific/Marquesas" => "(GMT-09:30) Marquesas Islands",
"Pacific/Gambier" => "(GMT-09:00) Gambier Islands",
"America/Anchorage" => "(GMT-09:00) Alaska",
"America/Ensenada" => "(GMT-08:00) Tijuana, Baja California",
"Etc/GMT+8" => "(GMT-08:00) Pitcairn Islands",
"America/Los_Angeles" => "(GMT-08:00) Pacific Time (US & Canada)",
"America/Denver" => "(GMT-07:00) Mountain Time (US & Canada)",
"America/Chihuahua" => "(GMT-07:00) Chihuahua, La Paz, Mazatlan",
"America/Dawson_Creek" => "(GMT-07:00) Arizona",
"America/Belize" => "(GMT-06:00) Saskatchewan, Central America",
"America/Cancun" => "(GMT-06:00) Guadalajara, Mexico City, Monterrey",
"Chile/EasterIsland" => "(GMT-06:00) Easter Island",
"America/Chicago" => "(GMT-06:00) Central Time (US & Canada)",
"America/New_York" => "(GMT-05:00) Eastern Time (US & Canada)",
"America/Havana" => "(GMT-05:00) Cuba",
"America/Bogota" => "(GMT-05:00) Bogota, Lima, Quito, Rio Branco",
"America/Caracas" => "(GMT-04:30) Caracas",
"America/Santiago" => "(GMT-04:00) Santiago",
"America/La_Paz" => "(GMT-04:00) La Paz",
"Atlantic/Stanley" => "(GMT-04:00) Faukland Islands",
"America/Campo_Grande" => "(GMT-04:00) Brazil",
"America/Goose_Bay" => "(GMT-04:00) Atlantic Time (Goose Bay)",
"America/Glace_Bay" => "(GMT-04:00) Atlantic Time (Canada)",
"America/St_Johns" => "(GMT-03:30) Newfoundland",
"America/Araguaina" => "(GMT-03:00) UTC-3",
"America/Montevideo" => "(GMT-03:00) Montevideo",
"America/Miquelon" => "(GMT-03:00) Miquelon, St. Pierre",
"America/Godthab" => "(GMT-03:00) Greenland",
"America/Argentina/Buenos_Aires" => "(GMT-03:00) Buenos Aires",
"America/Sao_Paulo" => "(GMT-03:00) Brasilia",
"America/Noronha" => "(GMT-02:00) Mid-Atlantic",
"Atlantic/Cape_Verde" => "(GMT-01:00) Cape Verde Is",
"Atlantic/Azores" => "(GMT-01:00) Azores",
"Europe/Belfast" => "(GMT) Greenwich Mean Time : Belfast",
"Europe/Dublin" => "(GMT) Greenwich Mean Time : Dublin",
"Europe/Lisbon" => "(GMT) Greenwich Mean Time : Lisbon",
"Europe/London" => "(GMT) Greenwich Mean Time : London",
"Africa/Abidjan" => "(GMT) Monrovia, Reykjavik",
"Europe/Amsterdam" => "(GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna",
"Europe/Belgrade" => "(GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague",
"Europe/Brussels" => "(GMT+01:00) Brussels, Copenhagen, Madrid, Paris",
"Africa/Algiers" => "(GMT+01:00) West Central Africa",
"Africa/Windhoek" => "(GMT+01:00) Windhoek",
"Asia/Beirut" => "(GMT+02:00) Beirut",
"Africa/Cairo" => "(GMT+02:00) Cairo",
"Asia/Gaza" => "(GMT+02:00) Gaza",
"Africa/Blantyre" => "(GMT+02:00) Harare, Pretoria",
"Asia/Jerusalem" => "(GMT+02:00) Jerusalem",
"Europe/Minsk" => "(GMT+02:00) Minsk",
"Asia/Damascus" => "(GMT+02:00) Syria",
"Europe/Moscow" => "(GMT+03:00) Moscow, St. Petersburg, Volgograd",
"Africa/Addis_Ababa" => "(GMT+03:00) Nairobi",
"Asia/Tehran" => "(GMT+03:30) Tehran",
"Asia/Dubai" => "(GMT+04:00) Abu Dhabi, Muscat",
"Asia/Yerevan" => "(GMT+04:00) Yerevan",
"Asia/Kabul" => "(GMT+04:30) Kabul",
"Asia/Yekaterinburg" => "(GMT+05:00) Ekaterinburg",
"Asia/Tashkent" => "(GMT+05:00) Tashkent",
"Asia/Kolkata" => "(GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi",
"Asia/Katmandu" => "(GMT+05:45) Kathmandu",
"Asia/Dhaka" => "(GMT+06:00) Astana, Dhaka",
"Asia/Novosibirsk" => "(GMT+06:00) Novosibirsk",
"Asia/Rangoon" => "(GMT+06:30) Yangon (Rangoon)",
"Asia/Bangkok" => "(GMT+07:00) Bangkok, Hanoi, Jakarta",
"Asia/Krasnoyarsk" => "(GMT+07:00) Krasnoyarsk",
"Asia/Hong_Kong" => "(GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi",
"Asia/Irkutsk" => "(GMT+08:00) Irkutsk, Ulaan Bataar",
"Australia/Perth" => "(GMT+08:00) Perth",
"Australia/Eucla" => "(GMT+08:45) Eucla",
"Asia/Tokyo" => "(GMT+09:00) Osaka, Sapporo, Tokyo",
"Asia/Seoul" => "(GMT+09:00) Seoul",
"Asia/Yakutsk" => "(GMT+09:00) Yakutsk",
"Australia/Adelaide" => "(GMT+09:30) Adelaide",
"Australia/Darwin" => "(GMT+09:30) Darwin",
"Australia/Brisbane" => "(GMT+10:00) Brisbane",
"Australia/Hobart" => "(GMT+10:00) Hobart",
"Asia/Vladivostok" => "(GMT+10:00) Vladivostok",
"Australia/Lord_Howe" => "(GMT+10:30) Lord Howe Island",
"Etc/GMT-11" => "(GMT+11:00) Solomon Is, New Caledonia",
"Asia/Magadan" => "(GMT+11:00) Magadan",
"Pacific/Norfolk" => "(GMT+11:30) Norfolk Island",
"Asia/Anadyr" => "(GMT+12:00) Anadyr, Kamchatka",
"Pacific/Auckland" => "(GMT+12:00) Auckland, Wellington",
"Etc/GMT-12" => "(GMT+12:00) Fiji, Kamchatka, Marshall Is",
"Pacific/Chatham" => "(GMT+12:45) Chatham Islands",
"Pacific/Tongatapu" => "(GMT+13:00) Nuku'alofa",
"Pacific/Kiritimati" => "(GMT+14:00) Kiritimati"
);
2. 获取GMT标准时间
echo 'GMT :'.date("m/d/Y H:i", time() - date("Z"));
3. GMT to local time
下面的程序结合上面两条，将更加有用。
<?php
// I am using the convention (assumption) of "07/04/2004 14:45"
$processdate = "12/04/2010 14:45"; // date("m/d/Y H:i", time() - date("Z")) is GMT
// gmttolocal is a function
// i am passing it 2 parameters:
// 1)the date in the above format and
// 2)time difference as a number; -5 in our case (GMT to CDT)
echo gmttolocal($processdate,-5);
function gmttolocal($mydate,$mydifference)
{
// trying to seperate date and time
$datetime = explode(" ",$mydate);
// trying to seperate different elements in a date
$dateexplode = explode("/",$datetime[0]);
// trying to seperate different elements in time
$timeexplode = explode(":",$datetime[1]);
// getting the unix datetime stamp
$unixdatetime = mktime($timeexplode[0]+$mydifference,$timeexplode[1],0,$dateexplode[0],$dateexplode[1],$dateexplode[2]);
// return the local date
return date("m/d/Y H:i",$unixdatetime);
}
什么是GMT？
格林尼治标准时间（GMT）
由来
由于地球轨道并非圆形，其运行速度又随着地球与太阳的距离改变而出现变化，因此视太阳时欠缺均匀性。视太阳日的长度同时亦受到地球自转轴相对轨道面的倾 斜度所影响。为着要纠正上述的不均匀性，天文学家计算地球非圆形轨迹与极轴倾斜对视太阳时的效应。平太阳时就是指经修订后的视太阳时。在格林尼治子午线上 的平太阳时称为世界时(UT0)，又叫格林尼治平时(GMT)。
北京时间与GMT时间关系
GMT是中央时区,北京在东8区,相差8个小时 所以北京时间=GMT时间+八小时 Greenwich mean time 【天】格林尼治标准时间
拓展小链接
http://geolite.maxmind.com/download/geoip/database/
http://codeigniter.com/forums/viewthread/110099/
另外也可以参看： php获得可靠的精准的当前时间 ( 通过授时服务器 )