如何在Java中使用Timezone解决夏令时 [英] How to tackle daylight savings using Timezone in java

问题描述

我必须在我的java应用程序中打印EST时间。我已使用

I have to print the EST time in my java application. I had set the timezone to EST using

Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("EST"));

但是当在这个时区遵循夏令时，我的代码不打印正确的时间它打印少1小时）。如何使代码工作，总是读取正确的时间，无论是否遵守夏令时。

But when the daylight savings is being followed in this timezone, my code does not print the correct time(It prints 1 hour less). How to make the code work to read the correct time always irrespective of whether the daylight savings are being observed or not.

PS：我尝试将时区设置为EDT，但它不能解决问题

PS: I tried setting the timezone to EDT, but it does'nt solve the problem

推荐答案

这是开始的问题：

Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("EST"));

应全心避免使用3个字母的缩写，以利于TZDB区域ID。 EST是东部标准时间 - 和标准时间从未观察到DST;它并不是一个完整的时区名称。它是用于时区的部分的名称。 （不幸的是，我没有遇到这个半时区概念的好词。）

The 3-letter abbreviations should be wholeheartedly avoided in favour of TZDB zone IDs. EST is Eastern Standard Time - and Standard time never observes DST; it's not really a full time zone name. It's the name used for part of a time zone. (Unfortunately I haven't come across a good term for this "half time zone" concept.)

你想要一个 。例如， America / New_York 位于东部时区：

You want a full time zone name. For example, America/New_York is in the Eastern time zone:

TimeZone zone = TimeZone.getTimeZone("America/New_York");
DateFormat format = DateFormat.getDateTimeInstance();
format.setTimeZone(zone);

System.out.println(format.format(new Date()));

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