从字符串开始的Java星期几 [英] Java day of the week from string

问题描述

我有这个简单的代码：

  SimpleDateFormat format = new SimpleDateFormat（yyyy-MM-dd）; 
日期日期= format.parse（2011-10-29）; 
 calendar.setTime（date）; 
 Log.d（Debug，星期几=+（calendar.get（Calendar.DAY_OF_WEEK）== Calendar.SATURDAY））; 
  

10月29日是星期六，为什么我会弄错？

解决方案

这是一个如何发生这种情况的例子......

  SimpleDateFormat format = new SimpleDateFormat（yyyy-MM-dd）; 
 Date date = null; 
 try {
 date = format.parse（2011-10-29）; 
} catch（ParseException e）{
 e.printStackTrace（）; 
} 
日历日历= Calendar.getInstance（TimeZone.getTimeZone（GMT））; 
 calendar.setTime（date）; 
 System.out.println（星期几=
 +（calendar.get（Calendar.DAY_OF_WEEK）））; 
 System.out.println（星期六？
 +（calendar.get（Calendar.DAY_OF_WEEK）== Calendar.SATURDAY））; 
 
 try {
 date = format.parse（2011-10-29）; 
} catch（ParseException e）{
 e.printStackTrace（）; 
} 
 calendar = Calendar.getInstance（TimeZone.getTimeZone（PST））; 
 calendar.setTime（date）; 
 System.out.println（星期几=
 +（calendar.get（Calendar.DAY_OF_WEEK）））; 
 System.out.println（星期六？
 +（calendar.get（Calendar.DAY_OF_WEEK）== Calendar.SATURDAY））; 
  

输出

 星期六= 7 
星期六？真的
星期几= 6 
星期六？ false 
  

所以是的，取决于你所在的时区将是或不会是星期六。 / p>

I have this simple code:

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date date = format.parse("2011-10-29");
calendar.setTime(date);
Log.d("Debug","Day of the week = "+(calendar.get(Calendar.DAY_OF_WEEK)==Calendar.SATURDAY));

The 29th of October is a Saturday so why do I get false?

解决方案

Here is an example of how this could happen...

    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    Date date = null;
    try {
        date = format.parse("2011-10-29");
    } catch (ParseException e) {
        e.printStackTrace();
    }
    Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
    calendar.setTime(date);
    System.out.println("Day of the week = "
            + (calendar.get(Calendar.DAY_OF_WEEK)));
    System.out.println("Saturday? "
            + (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY));

    try {
        date = format.parse("2011-10-29");
    } catch (ParseException e) {
        e.printStackTrace();
    }
    calendar = Calendar.getInstance(TimeZone.getTimeZone("PST"));
    calendar.setTime(date);
    System.out.println("Day of the week = "
            + (calendar.get(Calendar.DAY_OF_WEEK)));
    System.out.println("Saturday? "
            + (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY));

which outputs

Day of the week = 7
Saturday? true
Day of the week = 6
Saturday? false

so yes, depending on what time zone you are in it will or will not be Saturday.

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