记录是根据美国时区保存的,但如果我想向用户显示相同记录,则应将服务器日期时间转换为(美国时区)至用户日期时间与用户时区
答案 0 :(得分:12)
如果您输入谷歌“Java日期更改时区”或“Javascript日期更改时区”。您将得到一个结果:
在Java中(来源:http://www.coderanch.com/t/417443/java/java/Convert-Date-one-timezone-another)
Date date = new Date();
DateFormat formatter = new SimpleDateFormat("dd MMM yyyy HH:mm:ss z");
formatter.setTimeZone(TimeZone.getTimeZone("CET"));
// Prints the date in the CET timezone
System.out.println(formatter.format(date));
// Set the formatter to use a different timezone
formatter.setTimeZone(TimeZone.getTimeZone("IST"));
// Prints the date in the IST timezone
System.out.println(formatter.format(date));
Javascript(来源:http://www.techrepublic.com/article/convert-the-local-time-to-another-time-zone-with-this-javascript/6016329)
// function to calculate local time
// in a different city
// given the city's UTC offset
function calcTime(city, offset) {
// create Date object for current location
d = new Date();
// convert to msec
// add local time zone offset
// get UTC time in msec
utc = d.getTime() + (d.getTimezoneOffset() * 60000);
// create new Date object for different city
// using supplied offset
nd = new Date(utc + (3600000*offset));
// return time as a string
return "The local time in " + city + " is " + nd.toLocaleString();
}
// get Bombay time
alert(calcTime('Bombay', '+5.5'));
答案 1 :(得分:8)
旧的日期时间类设计糟糕,令人困惑且麻烦。避免它们。
使用现代类:Java 8及更高版本中内置的java.time框架。找到后端for earlier Java 6 & 7和for Android。
Instant now = Instant.now();
应用时区(ZoneId
)以获得ZonedDateTime
。
切勿使用3-4个字母区域缩写,例如EST
或IST
。它们既不标准也不独特(!)。使用proper time zone names格式,continent/region
格式,例如Asia/Kolkata
,Pacific/Auckland
,America/Los_Angeles
。
ZoneId zoneId_Montreal = ZoneId.of( "America/Montreal" );
ZonedDateTime zdt_Montreal = ZonedDateTime.ofInstant( instant , zoneId_Montreal );
应用其他时区生成另一个ZonedDateTime
调整到该时区。致电withZoneSameInstant
。
ZoneId zoneId_Paris = ZoneId.of( "Europe/Paris" ); // Or "Asia/Kolkata", etc.
ZonedDateTime zdt_Paris = zdt_Montreal.withZoneSameInstant( zoneId_Paris );
Instant instant = zdt_Paris.toInstant();
答案 2 :(得分:2)
TimeZone fromTimezone =TimeZone.getTimeZone(from);
TimeZone toTimezone=TimeZone.getTimeZone(to);
long fromOffset = fromTimezone.getOffset(calendar.getTimeInMillis());
long toOffset = toTimezone.getOffset(calendar.getTimeInMillis());
long convertedTime = calendar.getTimeInMillis() - (fromOffset - toOffset);
答案 3 :(得分:0)
//Convert date from one zone to another
/*
$zone_from='Asia/Kolkata';
$zone_to='America/Phoenix';
date_default_timezone_set($zone_from);
$convert_date="2016-02-26 10:35:00";
echo $finalDate=zone_conversion_date($convert_date, $zone_from, $zone_to);
*/
function zone_conversion_date($time, $cur_zone, $req_zone)
{
date_default_timezone_set("GMT");
$gmt = date("Y-m-d H:i:s");
date_default_timezone_set($cur_zone);
$local = date("Y-m-d H:i:s");
date_default_timezone_set($req_zone);
$required = date("Y-m-d H:i:s");
/* return $required; */
$diff1 = (strtotime($gmt) - strtotime($local));
$diff2 = (strtotime($required) - strtotime($gmt));
$date = new DateTime($time);
$date->modify("+$diff1 seconds");
$date->modify("+$diff2 seconds");
return $timestamp = $date->format("Y-m-d H:i:s");
}
答案 4 :(得分:0)
代码获取柏林时间并将其转换为UTC时间
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