Calendar.getTime()失败，出现java.lang.IllegalArgumentException:MINUTE(亚洲/新加坡时区) [英] Calendar.getTime() fails with java.lang.IllegalArgumentException:MINUTE for Asia/Singapore timezone

问题描述

为什么此代码失败?目的是删除时间部分.

Why is this code failing? The purpose was to remove the time part.

String dateStr = "1982-01-01";
String timeZoneID = "Asia/Singapore";

DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date date = dateFormat.parse(dateStr);      

Calendar calendar = Calendar.getInstance();
calendar.setTimeZone(TimeZone.getTimeZone(timeZoneID));
calendar.setLenient(false);
calendar.setTime(date);
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);

System.out.println(calendar.getTime());

错误消息:

Exception in thread "main" java.lang.IllegalArgumentException: MINUTE
    at java.util.GregorianCalendar.computeTime(GregorianCalendar.java:2482)
    at java.util.Calendar.updateTime(Calendar.java:2265)
    at java.util.Calendar.getTimeInMillis(Calendar.java:1049)
    at java.util.Calendar.getTime(Calendar.java:1022)
    at Prog.main(Prog.java:31)

在以下输入中工作正常:

It works fine for the following input:

• dateStr ="1982-01-01"，timeZoneID =欧洲/柏林"
• dateStr ="1981-01-01"，timeZoneID =亚洲/新加坡"
• dateStr ="1982-01-01"，timeZoneID =亚洲/首尔"

推荐答案

您的代码从1982年1月1日开始，并将HOUR_OF_DAY和MINUTE都设置为0.

Your code starts with the date 1/1/1982 and sets both HOUR_OF_DAY and MINUTE to 0.

但是1982年1月1日，新加坡没有12:00:00 AM.1981年12月31日晚上11:59:59之后，新加坡跳了半个小时才到12:30 AM.它以前是UTC + 7:30，但移到了UTC + 8的全时区.

But there was no 12:00:00 AM on January 1, 1982, in Singapore. After 11:59:59 PM on December 31, 1981, Singapore jumped ahead by half an hour to 12:30 AM. It had previously been at UTC+7:30, but moved to the whole-hour zone of UTC+8.

来源:新加坡标准时间和 为什么新加坡处于错误"时区?/em> 简要了解新加坡的时间历史.

Sources: Singapore Standard Time and timeanddate.com. See also Why is Singapore in the "wrong" time zone? for a brief history of time in Singapore.

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