我試圖將Date
轉換爲String
,然後再回到Date
。但是我發現最終日期與原始日期不同,是什麼給了?Java,將日期轉換爲字符串並返回錯誤日期
//1975-06-20
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, 1975);
cal.set(Calendar.MONTH, 5);
cal.set(Calendar.DAY_OF_MONTH, 20);
cal.set(Calendar.HOUR, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
System.out.println(cal);
Date originalDate = cal.getTime();
System.out.println("Date 1: " + originalDate.toString());
SimpleDateFormat sdf = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy");
Date date = sdf.parse(originalDate.toString());
System.out.println("Date 2: " + date.toString());
從上面的代碼的輸出是:
cal: java.util.GregorianCalendar[time=?,areFieldsSet=false,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Singapore",offset=28800000,dstSavings=0,useDaylight=false,transitions=9,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=1975,MONTH=5,WEEK_OF_YEAR=26,WEEK_OF_MONTH=5,DAY_OF_MONTH=20,DAY_OF_YEAR=179,DAY_OF_WEEK=4,DAY_OF_WEEK_IN_MONTH=4,AM_PM=1,HOUR=0,HOUR_OF_DAY=16,MINUTE=0,SECOND=0,MILLISECOND=333,ZONE_OFFSET=28800000,DST_OFFSET=0]
Date 1: Fri Jun 20 12:00:00 SGT 1975
Date 2: Fri Jun 20 11:30:00 SGT 1975
[日曆](http://docs.oracle.com/javase/6 /docs/api/java/util/Calendar.html)是可識別的區域,其中Date不是。請參閱[這篇文章的更多信息](http://stackoverflow.com/questions/2697549/how-to-make-date-locale-independent) – Brad
沒有DateFormat.format(String,String)方法。你的代碼不能編譯。格式化Date的toString()表示有什麼意義?爲什麼要解析originalDate的toString()而不是解析格式化日期? –
@Brad,[它不是?](http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/util/Date.java#Date。 toString%28%29) – JMelnik