Java Gregorian日历返回错误月份 [英] Java Gregorian Calendar Returns Wrong Month

问题描述

所以我一直在这里几个小时，它返回正确的年，日，但由于一些奇怪的原因，它返回错误的月份。我相信它是一个简单的修复，但我似乎不能弄清楚。

So I been at this for a few hours now and it returns the correct Year, and Day but for some odd reason it returns the wrong month. I'm sure its a simple fix but I can't seem to figure it out.

package gregoriancalendar;

import java.util.GregorianCalendar;

public class Calendar8_5 {



public static void main(String[] args){

GregorianCalendar calendar = new GregorianCalendar();
System.out.println("Current Year, Month & Date: ");
System.out.println("Year is " + calendar.get(1));
System.out.println("Month is " + calendar.get(2));
System.out.println("Day is " + calendar.get(5));


calendar.setTimeInMillis(1234567898765L);
//Elapse Time
System.out.println("Set Value of 1234567898765L");
System.out.println("Year is " + calendar.get(1));
System.out.println("Month is " + calendar.get(2));
System.out.println("Day is " + calendar.get(5));
   }
  }

推荐答案

那么有一个工作围绕这个吗？

So is there a work around this?

是的，有一个解决方法。使用一个好的日期时间库，而不是java.util.Date/Calendar。

Yes, there is a workaround. Use a good date-time library rather than the mess that is java.util.Date/Calendar.

• 使用 Joda - 时间 2.3。


• 以后，使用Java 8，考虑移至 JSR 310：日期和时间API ，它取代了日期/日历类并受Joda-Time的启发。

• Use Joda-Time 2.3 now.
• In the future, with Java 8, consider moving to JSR 310: Date and Time API which supplants the Date/Calendar classes and is inspired by Joda-Time.

// © 2013 Basil Bourque. This source code may be used freely forever by anyone taking full responsibility for doing so.
// import org.joda.time.*;

// Generally best to be explicit about time zone rather than depend on default.
DateTimeZone denverTimeZone = DateTimeZone.forID( "America/Denver" );
java.util.Locale locale = Locale.FRANCE;

DateTime now = new DateTime( denverTimeZone );

System.out.println( "Current Year, Month & Day for: " + now );
System.out.println( "Year is " + now.year().getAsText( locale ) );
System.out.println( "Month is " + now.monthOfYear().getAsText( locale ) );
System.out.println( "Day is " + now.dayOfMonth().getAsText( locale ) );
System.out.println(); // blank line.

运行时...

Current Year, Month & Day for: 2013-12-04T01:58:24.322-07:00
Year is 2013
Month is décembre
Day is 4

有些日子

Some Day

// Not generally a good idea to focus on integers for working with date-time, but you asked for it.
DateTime someDateTime = new DateTime( 1234567898765L, DateTimeZone.UTC );

System.out.println( "Set Value of 1234567898765L is: " + someDateTime );
System.out.println( "Year is " + someDateTime.year().getAsText( locale ) );
System.out.println( "Month is " + someDateTime.monthOfYear().getAsText( locale ) );
System.out.println( "Day of month is " + someDateTime.dayOfMonth().getAsText( locale ) );
System.out.println( "Day of week is " + someDateTime.dayOfWeek().getAsText( locale ) );
System.out.println( "Day of year is " + someDateTime.dayOfYear().getAsText( locale ) );

运行时...

Set Value of 1234567898765L is: 2009-02-13T23:31:38.765Z
Year is 2009
Month is février
Day of month is 13
Day of week is vendredi
Day of year is 44

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PS当我注意到你任意选择的Long在星期五第十三次的时候，我只是冷静下来了。

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P.S. I just got the chills down my back when I noticed your arbitrarily chosen Long resulted in Friday The Thirteenth!

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