如何在 Java 中获取时区的当前日期和时间？
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How to get the current date and time of your timezone in Java?
提问by Sergio del Amo
I have my app hosted in a London Server. I am in Madrid, Spain. So the timezone is -2 hours.
我的应用程序托管在伦敦服务器中。我在西班牙马德里。所以时区是-2小时。
How can I obtain the current date / time with my time zone.
如何使用我的时区获取当前日期/时间。
Date curr_date = new Date(System.currentTimeMillis());
e.g.
例如
Date curr_date = new Date(System.currentTimeMillis("MAD_TIMEZONE"));
With Joda-Time
与乔达时间
DateTimeZone zone = DateTimeZone.forID("Europe/Madrid");
DateTime dt = new DateTime(zone);
int day = dt.getDayOfMonth();
int year = dt.getYear();
int month = dt.getMonthOfYear();
int hours = dt.getHourOfDay();
int minutes = dt.getMinuteOfHour();
采纳答案by Jon Skeet
Dateis alwaysUTC-based... or time-zone neutral, depending on how you want to view it. A Dateonlyrepresents a point in time; it is independent of time zone, just a number of milliseconds since the Unix epoch. There's no notion of a "local instance of Date." Use Datein conjunction with Calendarand/or TimeZone.getDefault()to use a "local" time zone. Use TimeZone.getTimeZone("Europe/Madrid")to get the Madrid time zone.
Date是始终基于UTC ...或时区中立的，这取决于你想如何看待它。甲Date只表示在一个时间点; 它与时区无关，自 Unix 纪元以来只有几毫秒。没有“本地实例”的概念Date。使用Date会同Calendar和/或TimeZone.getDefault()使用“本地”时区。使用TimeZone.getTimeZone("Europe/Madrid")得到马德里时区。
... or use Joda Time, which tends to make the whole thing clearer, IMO. In Joda Time you'd use a DateTimevalue, which is an instant in time in a particular calendar system and time zone.
...或使用Joda Time，这往往会使整个事情更清晰，IMO。在 Joda Time 中，您将使用一个DateTime值，它是特定日历系统和时区中的一个瞬间。
In Java 8 you'd use java.time.ZonedDateTime, which is the Java 8 equivalent of Joda Time's DateTime.
在 Java 8 中，您会使用java.time.ZonedDateTime，它是 Java 8 中 Joda Time 的DateTime.
回答by Joshua Partogi
回答by dfa
回答by Martijn Courteaux
Here is an example:
下面是一个例子：
Calendar c = Calendar.getInstance(TimeZone.getDefault());
Date date = c.getTime();
回答by Jesper
As Jon Skeet already said, java.util.Datedoes not have a time zone. A Dateobject represents a number of milliseconds since January 1, 1970, 12:00 AM, UTC. It does not contain time zone information.
正如 Jon Skeet 已经说过的，java.util.Date没有时区。一个Date对象表示自1970年1月1日，上午12:00，UTC毫秒数。它不包含时区信息。
When you format a Date object into a string, for example by using SimpleDateFormat, then you can set the time zone on the DateFormatobject to let it know in which time zone you want to display the date and time:
当您将 Date 对象格式化为字符串时，例如使用SimpleDateFormat，您可以在DateFormat对象上设置时区，让它知道您希望在哪个时区显示日期和时间：
Date date = new Date();
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
// Use Madrid's time zone to format the date in
df.setTimeZone(TimeZone.getTimeZone("Europe/Madrid"));
System.out.println("Date and time in Madrid: " + df.format(date));
If you want the local time zone of the computer that your program is running on, use:
如果您想要运行程序的计算机的本地时区，请使用：
df.setTimeZone(TimeZone.getDefault());
回答by wjin
I couldn't get it to work using Calendar. You have to use DateFormat
我无法使用日历使其正常工作。你必须使用 DateFormat
//Wednesday, July 20, 2011 3:54:44 PM PDT
DateFormat df = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);
df.setTimeZone(TimeZone.getTimeZone("PST"));
final String dateTimeString = df.format(new Date());
//Wednesday, July 20, 2011
df = DateFormat.getDateInstance(DateFormat.FULL);
df.setTimeZone(TimeZone.getTimeZone("PST"));
final String dateString = df.format(new Date());
//3:54:44 PM PDT
df = DateFormat.getTimeInstance(DateFormat.FULL);
df.setTimeZone(Timezone.getTimeZone("PST"));
final String timeString = df.format(new Date());
回答by shamim
DateFormat df = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);
df.setTimeZone(TimeZone.getTimeZone("PST"));
final String dateTimeString = df.format(new Date());
回答by Subhamay
Check this may be helpful. Works fine for me. Code also covered daylight savings
检查这可能会有所帮助。对我来说很好用。代码还涵盖了夏令时
TimeZone tz = TimeZone.getTimeZone("Asia/Shanghai");
Calendar cal = Calendar.getInstance();
// If needed in hours rather than milliseconds
int LocalOffSethrs = (int) ((cal.getTimeZone().getRawOffset()) *(2.77777778 /10000000));
int ChinaOffSethrs = (int) ((tz.getRawOffset()) *(2.77777778 /10000000));
int dts = cal.getTimeZone().getDSTSavings();
System.out.println("Local Time Zone : " + cal.getTimeZone().getDisplayName());
System.out.println("Local Day Light Time Saving : " + dts);
System.out.println("China Time : " + tz.getRawOffset());
System.out.println("Local Offset Time from GMT: " + LocalOffSethrs);
System.out.println("China Offset Time from GMT: " + ChinaOffSethrs);
// Adjust to GMT
cal.add(Calendar.MILLISECOND,-(cal.getTimeZone().getRawOffset()));
// Adjust to Daylight Savings
cal.add(Calendar.MILLISECOND, - cal.getTimeZone().getDSTSavings());
// Adjust to Offset
cal.add(Calendar.MILLISECOND, tz.getRawOffset());
Date dt = new Date(cal.getTimeInMillis());
System.out.println("After adjusting offset Acctual China Time :" + dt);
回答by shan
Here are some steps for finding Time for your zone:
以下是为您的区域查找时间的一些步骤：
Date now = new Date();
现在日期 = 新日期();
DateFormat df = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
df.setTimeZone(TimeZone.getTimeZone("Europe/London"));
System.out.println("timeZone.......-->>>>>>"+df.format(now));
回答by Zeeshan
With the java.timeclasses built into Java 8 and later:
使用Java 8 及更高版本中内置的java.time类：
public static void main(String[] args) {
LocalDateTime localNow = LocalDateTime.now(TimeZone.getTimeZone("Europe/Madrid").toZoneId());
System.out.println(localNow);
// Prints current time of given zone without zone information : 2016-04-28T15:41:17.611
ZonedDateTime zoneNow = ZonedDateTime.now(TimeZone.getTimeZone("Europe/Madrid").toZoneId());
System.out.println(zoneNow);
// Prints current time of given zone with zone information : 2016-04-28T15:41:17.627+02:00[Europe/Madrid]
}
