1.java.util.Calendar
Calendar 类是一个抽象类,它为特定瞬间与一组诸如 YEAR、MONTH、DAY_OF_MONTH、HOUR 等 日历字段之间的转换提供了一些方法,并为操作日历字段(例如获得下星期的日期)提供了一些方法。瞬间可用毫秒值来表示,它是距历元(即格林威治标准时间 1970 年 1 月 1 日的 00:00:00.000,格里高利历)的偏移量。
例:
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1.Calendar cal = Calendar.getInstance();//使用默认时区和语言环境获得一个日历。
2.cal.add(Calendar.DAY_OF_MONTH, -1);//取当前日期的前一天.
3.
4.cal.add(Calendar.DAY_OF_MONTH, +1);//取当前日期的后一天.
5.
6.//通过格式化输出日期
7.java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");
8.
9.System.out.println("Today is:"+format.format(Calendar.getInstance().getTime()));
10.
11.System.out.println("yesterday is:"+format.format(cal.getTime()));
Calendar cal = Calendar.getInstance();//使用默认时区和语言环境获得一个日历。
cal.add(Calendar.DAY_OF_MONTH, -1);//取当前日期的前一天.
cal.add(Calendar.DAY_OF_MONTH, +1);//取当前日期的后一天.
//通过格式化输出日期
java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");
System.out.println("Today is:"+format.format(Calendar.getInstance().getTime()));
System.out.println("yesterday is:"+format.format(cal.getTime()));
1.Calendar cal = Calendar.getInstance();//使用默认时区和语言环境获得一个日历。
2.cal.add(Calendar.DAY_OF_MONTH, -1);//取当前日期的前一天.
3.
4.cal.add(Calendar.DAY_OF_MONTH, +1);//取当前日期的后一天.
5.
6.//通过格式化输出日期
7.java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");
8.
9.System.out.println("Today is:"+format.format(Calendar.getInstance().getTime()));
10.
11.System.out.println("yesterday is:"+format.format(cal.getTime()));
Calendar cal = Calendar.getInstance();//使用默认时区和语言环境获得一个日历。
cal.add(Calendar.DAY_OF_MONTH, -1);//取当前日期的前一天.
cal.add(Calendar.DAY_OF_MONTH, +1);//取当前日期的后一天.
//通过格式化输出日期
java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");
System.out.println("Today is:"+format.format(Calendar.getInstance().getTime()));
System.out.println("yesterday is:"+format.format(cal.getTime()));
得到2007-12-25日期:
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1.Calendar calendar = new GregorianCalendar(2007, 11, 25,0,0,0);
2.Date date = calendar.getTime();
3.System.out.println("2007 Christmas is:"+format.format(date));
1.Calendar calendar = new GregorianCalendar(2007, 11, 25,0,0,0);
2.Date date = calendar.getTime();
3.System.out.println("2007 Christmas is:"+format.format(date));
java月份是从0-11,月份设置时要减1.
GregorianCalendar构造方法参数依次为:年,月-1,日,时,分,秒.
取日期的部分:
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1.int year =calendar.get(Calendar.YEAR);
2.
3.int month=calendar.get(Calendar.MONTH)+1;
4.
5.int day =calendar.get(Calendar.DAY_OF_MONTH);
6.
7.int hour =calendar.get(Calendar.HOUR_OF_DAY);
8.
9.int minute =calendar.get(Calendar.MINUTE);
10.
11.int seconds =calendar.get(Calendar.SECOND);
1.int year =calendar.get(Calendar.YEAR);
2.
3.int month=calendar.get(Calendar.MONTH)+1;
4.
5.int day =calendar.get(Calendar.DAY_OF_MONTH);
6.
7.int hour =calendar.get(Calendar.HOUR_OF_DAY);
8.
9.int minute =calendar.get(Calendar.MINUTE);
10.
11.int seconds =calendar.get(Calendar.SECOND);
取月份要加1.
判断当前月份的最大天数:
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1.Calendar cal = Calendar.getInstance();
2.int day=cal.getActualMaximum(Calendar.DAY_OF_MONTH);
3.System.out.println(day);
1.Calendar cal = Calendar.getInstance();
2.int day=cal.getActualMaximum(Calendar.DAY_OF_MONTH);
3.System.out.println(day);
java.util.Date
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1.java.util.Date today=new java.util.Date();
2.System.out.println("Today is "+formats.format(today));
1.java.util.Date today=new java.util.Date();
2.System.out.println("Today is "+formats.format(today));
取当月的第一天:
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1.java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-01");
2.java.util.Date firstDay=new java.util.Date();
3.System.out.println("the month first day is "+formats.format(firstDay));
1.java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-01");
2.java.util.Date firstDay=new java.util.Date();
3.System.out.println("the month first day is "+formats.format(firstDay));
责任编辑:小草