java时间操作函数汇总
2010-04-09 10:24
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1.
计算某一月份的最大天数
Calendar time=Calendar.getInstance();
time.clear();
time.set(Calendar.YEAR,year);
time.set(Calendar.MONTH,i-1);//
注意,Calendar
对象默认一月为0
int day=time.getActualMaximum(Calendar.DAY_OF_MONTH);//
本月份的天数
注:在使用set
方法之前,必须先clear
一下,否则很多信息会继承自系统当前时间
2.Calendar
和Date
的转化
(1) Calendar
转化为Date
Calendar cal=Calendar.getInstance();
Date date=cal.getTime();
(2) Date
转化为Calendar
Date date=new Date();
Calendar cal=Calendar.getInstance();
cal.setTime(date);
3.
格式化输出日期时间
Date date=new Date();
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
System.out.println(df.format(date));
4.
计算一年中的第几星期
(1)
计算某一天是一年中的第几星期
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 8);
cal.set(Calendar.DAY_OF_MONTH, 3);
int weekno=cal.get(Calendar.WEEK_OF_YEAR);
(2)
计算一年中的第几星期是几号
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.WEEK_OF_YEAR, 1);
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
System.out.println(df.format(cal.getTime()));
输出:
2006-01-02
5.add()
和roll()
的用法
(1)add()
方法
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 8);
cal.set(Calendar.DAY_OF_MONTH, 3);
cal.add(Calendar.DATE, -4);
Date date=cal.getTime();
System.out.println(df.format(date));
cal.add(Calendar.DATE, 4);
date=cal.getTime();
System.out.println(df.format(date));
输出:
2006-08-30
2006-09-03
(2)roll
方法
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 8);
cal.set(Calendar.DAY_OF_MONTH, 3);
cal.roll(Calendar.DATE, -4);
date=cal.getTime();
System.out.println(df.format(date));
cal.roll(Calendar.DATE, 4);
date=cal.getTime();
System.out.println(df.format(date));
输出:
2006-09-29
2006-09-03
可见,roll()
方法在本月内循环,一般使用add()
方法;
6.
计算两个任意时间中间的间隔天数
(1)
传进Calendar
对象
/** *//**
计算两个时间之间相隔天数
* @param startday
开始时间
* @param endday
结束时间
* @return
*/
public int getIntervalDays(Calendar startday,Calendar endday)...{
//
确保startday
在endday
之前
if(startday.after(endday))...{
Calendar cal=startday;
startday=endday;
endday=cal;
}
//
分别得到两个时间的毫秒数
long sl=startday.getTimeInMillis();
long el=endday.getTimeInMillis();
long ei=el-sl;
//
根据毫秒数计算间隔天数
return (int)(ei/(1000*60*60*24));
}
(2)
传进Date
对象
/** *//**
计算两个时间之间相隔天数
* @param startday
开始时间
* @param endday
结束时间
* @return
*/
public int getIntervalDays(Date startday,Date endday)...{
//
确保startday
在endday
之前
if(startday.after(endday))...{
Date cal=startday;
startday=endday;
endday=cal;
}
//
分别得到两个时间的毫秒数
long sl=startday.getTime();
long el=endday.getTime();
long ei=el-sl;
//
根据毫秒数计算间隔天数
return (int)(ei/(1000*60*60*24));
}
同理,可以用相同的方法计算出任意两个时间相隔的小时数,分钟数,秒钟数等
注:以上方法是完全按时间计算,有时并不能令人满意,如:
startday="2006-10-11 20:00:00"
endday="2006-10-12 8:00:00"
计算结果为0
,但是我们也许相让计算结果变为1
,此时可以用如下方法实现:
在传参之前,先设定endday
的时间,如:
endday.set(Calendar.HOUR_OF_DAY, 23);
endday.set(Calendar.MINUTE, 59);
endday.set(Calendar.SECOND, 59);
endday.set(Calendar.MILLISECOND, 59);
这样再传进去startday,endday
,则结果就如我们所愿了。不过,如果嫌以上方法麻烦,可以参考以下方法:
(3)
改进精确计算相隔天数的方法
public int getDaysBetween (Calendar d1, Calendar d2) ...{
if (d1.after(d2)) ...{ // swap dates so that d1 is start and d2 is end
java.util.Calendar swap = d1;
d1 = d2;
d2 = swap;
}
int days = d2.get(Calendar.DAY_OF_YEAR) - d1.get(Calendar.DAY_OF_YEAR);
int y2 = d2.get(Calendar.YEAR);
if (d1.get(Calendar.YEAR) != y2) ...{
d1 = (Calendar) d1.clone();
do ...{
days += d1.getActualMaximum(Calendar.DAY_OF_YEAR);//
得到当年的实际天数
d1.add(Calendar.YEAR, 1);
} while (d1.get(Calendar.YEAR) != y2);
}
return days;
}
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1.
计算某一月份的最大天数
Calendar time=Calendar.getInstance();
time.clear();
time.set(Calendar.YEAR,year);
time.set(Calendar.MONTH,i-1);//
注意,Calendar
对象默认一月为0
int day=time.getActualMaximum(Calendar.DAY_OF_MONTH);//
本月份的天数
注:在使用set
方法之前,必须先clear
一下,否则很多信息会继承自系统当前时间
2.Calendar
和Date
的转化
(1) Calendar
转化为Date
Calendar cal=Calendar.getInstance();
Date date=cal.getTime();
(2) Date
转化为Calendar
Date date=new Date();
Calendar cal=Calendar.getInstance();
cal.setTime(date);
3.
格式化输出日期时间
Date date=new Date();
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
System.out.println(df.format(date));
4.
计算一年中的第几星期
(1)
计算某一天是一年中的第几星期
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 8);
cal.set(Calendar.DAY_OF_MONTH, 3);
int weekno=cal.get(Calendar.WEEK_OF_YEAR);
(2)
计算一年中的第几星期是几号
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.WEEK_OF_YEAR, 1);
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
System.out.println(df.format(cal.getTime()));
输出:
2006-01-02
5.add()
和roll()
的用法
(1)add()
方法
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 8);
cal.set(Calendar.DAY_OF_MONTH, 3);
cal.add(Calendar.DATE, -4);
Date date=cal.getTime();
System.out.println(df.format(date));
cal.add(Calendar.DATE, 4);
date=cal.getTime();
System.out.println(df.format(date));
输出:
2006-08-30
2006-09-03
(2)roll
方法
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 8);
cal.set(Calendar.DAY_OF_MONTH, 3);
cal.roll(Calendar.DATE, -4);
date=cal.getTime();
System.out.println(df.format(date));
cal.roll(Calendar.DATE, 4);
date=cal.getTime();
System.out.println(df.format(date));
输出:
2006-09-29
2006-09-03
可见,roll()
方法在本月内循环,一般使用add()
方法;
6.
计算两个任意时间中间的间隔天数
(1)
传进Calendar
对象
/** *//**
计算两个时间之间相隔天数
* @param startday
开始时间
* @param endday
结束时间
* @return
*/
public int getIntervalDays(Calendar startday,Calendar endday)...{
//
确保startday
在endday
之前
if(startday.after(endday))...{
Calendar cal=startday;
startday=endday;
endday=cal;
}
//
分别得到两个时间的毫秒数
long sl=startday.getTimeInMillis();
long el=endday.getTimeInMillis();
long ei=el-sl;
//
根据毫秒数计算间隔天数
return (int)(ei/(1000*60*60*24));
}
(2)
传进Date
对象
/** *//**
计算两个时间之间相隔天数
* @param startday
开始时间
* @param endday
结束时间
* @return
*/
public int getIntervalDays(Date startday,Date endday)...{
//
确保startday
在endday
之前
if(startday.after(endday))...{
Date cal=startday;
startday=endday;
endday=cal;
}
//
分别得到两个时间的毫秒数
long sl=startday.getTime();
long el=endday.getTime();
long ei=el-sl;
//
根据毫秒数计算间隔天数
return (int)(ei/(1000*60*60*24));
}
同理,可以用相同的方法计算出任意两个时间相隔的小时数,分钟数,秒钟数等
注:以上方法是完全按时间计算,有时并不能令人满意,如:
startday="2006-10-11 20:00:00"
endday="2006-10-12 8:00:00"
计算结果为0
,但是我们也许相让计算结果变为1
,此时可以用如下方法实现:
在传参之前,先设定endday
的时间,如:
endday.set(Calendar.HOUR_OF_DAY, 23);
endday.set(Calendar.MINUTE, 59);
endday.set(Calendar.SECOND, 59);
endday.set(Calendar.MILLISECOND, 59);
这样再传进去startday,endday
,则结果就如我们所愿了。不过,如果嫌以上方法麻烦,可以参考以下方法:
(3)
改进精确计算相隔天数的方法
public int getDaysBetween (Calendar d1, Calendar d2) ...{
if (d1.after(d2)) ...{ // swap dates so that d1 is start and d2 is end
java.util.Calendar swap = d1;
d1 = d2;
d2 = swap;
}
int days = d2.get(Calendar.DAY_OF_YEAR) - d1.get(Calendar.DAY_OF_YEAR);
int y2 = d2.get(Calendar.YEAR);
if (d1.get(Calendar.YEAR) != y2) ...{
d1 = (Calendar) d1.clone();
do ...{
days += d1.getActualMaximum(Calendar.DAY_OF_YEAR);//
得到当年的实际天数
d1.add(Calendar.YEAR, 1);
} while (d1.get(Calendar.YEAR) != y2);
}
return days;
}