javad处理日期时间

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JAVA处理日期时间相加减

2009-11-16 15:21

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));

取当月的最后一天:
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2.Calendar cal = Calendar.getInstance();
3.int maxDay=cals.getActualMaximum(Calendar.DAY_OF_MONTH);
4.java.text.Format formatter3=new java.text.SimpleDateFormat("yyyy-MM-"+maxDay);
5.System.out.println(formatter3.format(cal.getTime()));
2.Calendar cal = Calendar.getInstance();
3.int maxDay=cals.getActualMaximum(Calendar.DAY_OF_MONTH);
4.java.text.Format formatter3=new java.text.SimpleDateFormat("yyyy-MM-"+maxDay);
5.System.out.println(formatter3.format(cal.getTime()));

求两个日期之间相隔的天数:
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1.java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");
2.java.util.Date beginDate= format.parse("2007-12-24");
3.java.util.Date endDate= format.parse("2007-12-25");
4.long day=(date.getTime()-mydate.getTime())/(24*60*60*1000);
5.System.out.println("相隔的天数="+day);
1.java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");
2.java.util.Date beginDate= format.parse("2007-12-24");
3.java.util.Date endDate= format.parse("2007-12-25");
4.long day=(date.getTime()-mydate.getTime())/(24*60*60*1000);
5.System.out.println("相隔的天数="+day);

一年前的日期:
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1.java.text.Format formatter=new java.text.SimpleDateFormat("yyyy-MM-dd");
2.java.util.Date todayDate=new java.util.Date();
3.long beforeTime=(todayDate.getTime()/1000)-60*60*24*365;
4.todayDate.setTime(beforeTime*1000);
5.String beforeDate=formatter.format(todayDate);
6.System.out.println(beforeDate);
1.java.text.Format formatter=new java.text.SimpleDateFormat("yyyy-MM-dd");
2.java.util.Date todayDate=new java.util.Date();
3.long beforeTime=(todayDate.getTime()/1000)-60*60*24*365;
4.todayDate.setTime(beforeTime*1000);
5.String beforeDate=formatter.format(todayDate);
6.System.out.println(beforeDate);

一年后的日期:
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1.java.text.Format formatter=new java.text.SimpleDateFormat("yyyy-MM-dd");
2.java.util.Date todayDate=new java.util.Date();
3.long afterTime=(todayDate.getTime()/1000)+60*60*24*365;
4.todayDate.setTime(afterTime*1000);
5.String afterDate=formatter.format(todayDate);
6.System.out.println(afterDate);
1.java.text.Format formatter=new java.text.SimpleDateFormat("yyyy-MM-dd");
2.java.util.Date todayDate=new java.util.Date();
3.long afterTime=(todayDate.getTime()/1000)+60*60*24*365;
4.todayDate.setTime(afterTime*1000);
5.String afterDate=formatter.format(todayDate);
6.System.out.println(afterDate);

求10小时后的时间
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1.java.util.Calendar Cal=java.util.Calendar.getInstance();
2.Cal.setTime(dateOper);
3.Cal.add(java.util.Calendar.HOUR_OF_DAY,10);
4.System.out.println("date:"+forma.format(Cal.getTime()));
1.java.util.Calendar Cal=java.util.Calendar.getInstance();
2.Cal.setTime(dateOper);
3.Cal.add(java.util.Calendar.HOUR_OF_DAY,10);
4.System.out.println("date:"+forma.format(Cal.getTime()));

求10小时前的时间
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1.java.util.Calendar Cal=java.util.Calendar.getInstance();
2.Cal.setTime(dateOper);
3.Cal.add(java.util.Calendar.HOUR_OF_DAY,-10);
4.System.out.println("date:"+forma.format(Cal.getTime()));
1.java.util.Calendar Cal=java.util.Calendar.getInstance();
2.Cal.setTime(dateOper);
3.Cal.add(java.util.Calendar.HOUR_OF_DAY,-10);
4.System.out.println("date:"+forma.format(Cal.getTime()));

java.sql.Date

继承自java.util.Date,是操作数据库用的日期类型

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java.sql.Date sqlDate = new java.sql.Date(java.sql.Date.valueOf("2007-12-25").getTime());
java.sql.Date sqlDate = new java.sql.Date(java.sql.Date.valueOf("2007-12-25").getTime());

日期比较:简单的比较可以以字符串的形式直接比较,也可使用
java.sql.Date.valueOf("2007-03-08").compareTo(java.sql.Date.valueOf("2007-03-18"))方式来比较日期的大小.也可使用java.util.Date.after(java.util.Date)来比较.

相差时间：
long difference=c2.getTimeInMillis()-c1.getTimeInMillis();
相差天数：long day=difference/(3600*24*1000)
相差小时：long hour=difference/(3600*1000)
相差分钟：long minute=difference/(60*1000)
相差秒： long second=difference/1000

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1.DateFormat df=new SimpleDateFormat("yyyy-MM-dd EE hh:mm:ss");
2.System.out.println(df.format(new Date()));
3.Date date = new Date();
4.DateFormat shortDate=DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
5.DateFormat mediumDate =DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM);
6.DateFormat longDate =DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG);
7.DateFormat fullDate =DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);
8.
9.system.out.println(shortDate.format(date));
10.System.out.println(mediumDate.format(date));
11.System.out.println(longDate.format(date));
12.System.out.println(fullDate.format(date));
13.
14.08-4-15 下午3:24
15.2008-4-15 15:24:31
16.2008年4月15日下午03时24分31秒
17.2008年4月15日星期二下午03时24分31秒CST
18.
19.
20.Calendar c = Calendar.getInstance();
21.
22.c.add(Calendar.MONTH, 1); // 目前時間加1個月
23.System.out.println(df.format(c.getTime()));
24.
25.c.add(Calendar.HOUR, 3); // 目前時間加3小時
26.System.out.println(df.format(c.getTime()));
27.
28.c.add(Calendar.YEAR, -2); // 目前時間減2年
29.System.out.println(df.format(c.getTime()));
30.
31.c.add(Calendar.DAY_OF_WEEK, 7); // 目前的時間加7天
32.System.out.println(df.format(c.getTime()));