关于java代码日期减1的信息

Java Date类型 减一个月怎么做

String startDateStr = "";

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String endDateStr = "";

TimeZone tzES2 = TimeZone.getTimeZone("GMT+8");

Calendar calES2 = Calendar.getInstance(tzES2);

Calendar ca = Calendar.getInstance();

Date now = ca.getTime();

DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd");

dateFormat.setCalendar(calES2);

ca.set(Calendar.DATE, ca.getActualMinimum(Calendar.DAY_OF_MONTH));//设置当前日期为当前月的第一天

now = ca.getTime();

startDateStr = dateFormat.format(now);

ca.set(Calendar.DATE, ca.getActualMaximum(Calendar.DAY_OF_MONTH));//设置当前日期为当前月的最后一天

now = ca.getTime();

endDateStr = dateFormat.format(now);

System.out.println(startDateStr);

System.out.println(endDateStr);

ca.add(Calendar.MONTH, -1);//设置日期为当前日期加上-1个月(即减去1个月)的日期。

后面的操作同上！

java的前台传来一个Date日期的值,我想做的是:让这个日期减一天,比如页面上传来的是2013-1-1,那么减一天为

最简单的做法是：

// 假如这是前台传来的Date时间

Date dt;

// 1天的毫秒数

long oneDayTime = 1000*3600*24;

// 这个now就是减1天的时间了

Date nowTime = new Date(dt.getTime() - oneDayTime);

原理就是用Date的毫秒数做运算，最后再将运算出来的毫秒数再转换成时间。

用java实现日期类的加减

import java.util.Date;

import java.util.Calendar;

import java.text.SimpleDateFormat;

import java.util.*;

public class CalendarExample {

private static void CalendarTimemethod() {

Date date = Calendar.getInstance().getTime();

System.out.println("Current date and time is: " + date);

System.out.println();

}

private static void SimpleDateFormatmethod() {

Calendar date = Calendar.getInstance();

SimpleDateFormat dateformatter = new SimpleDateFormat(

"E yyyy.MM.dd 'at' hh:mm:ss a zzz");

System.out.println("Current date and time in simple date format: "

+ dateformatter.format(date.getTime()));

System.out.println();

}

private static void Adddates() {

System.out.println("Performing operations on calendar dates.");

// Get today's date

Calendar date = Calendar.getInstance();

Calendar cldr;

SimpleDateFormat dateformatter = new SimpleDateFormat(

"E yyyy.MM.dd 'at' hh:mm:ss a zzz");

cldr = (Calendar) date.clone();

cldr.add(Calendar.DAY_OF_YEAR, -(365 * 2));

System.out.println("Before two years it was: "

+ dateformatter.format(cldr.getTime()));

cldr = (Calendar) date.clone();

cldr.add(Calendar.DAY_OF_YEAR, +5);

System.out.println("After five years it will be: "

+ dateformatter.format(cldr.getTime()));

System.out.println();

}

private static void DateDifference() {

System.out.println("Difference between two dates");

Date startDate1 = new GregorianCalendar(2005, 02,

25, 14, 00).getTime();

Date endDate1 = new Date();

;

long diff = endDate1.getTime() - startDate1.getTime();

System.out.println(" Difference between " + endDate1);

System.out.println(" and " + startDate1 + " is " + (diff /

(1000L * 60L * 60L * 24L)) + " days.");

System.out.println();

}

private static void Getcalendermethods() {

System.out.println("Various get methods of the calendar class:");

Calendar calender = Calendar.getInstance();

System.out.println("Year : "

+ calender.get(Calendar.YEAR));

System.out.println("Month : "

+ calender.get(Calendar.MONTH));

System.out.println("Day of Month : "

+ calender.get(Calendar.DAY_OF_MONTH));

System.out.println("Day of Week : "

+ calender.get(Calendar.DAY_OF_WEEK));

System.out.println("Day of Year : "

+ calender.get(Calendar.DAY_OF_YEAR));

System.out.println("Week of Year : "

+ calender.get(Calendar.WEEK_OF_YEAR));

System.out.println("Week of Month : "

+ calender.get(Calendar.WEEK_OF_MONTH));

System.out.println("Day of the Week in Month : "

+ calender.get(Calendar.DAY_OF_WEEK_IN_MONTH));

System.out.println("Hour : " + calender.get(Calendar.HOUR));

System.out.println("AM PM : " + calender.get(Calendar.AM_PM));

System.out.println("Hour of the Day : "

+ calender.get(Calendar.HOUR_OF_DAY));

System.out.println("Minute : " + calender.get(Calendar.MINUTE));

System.out.println("Second : " + calender.get(Calendar.SECOND));

System.out.println();

}

public static void main(String[] args) {

System.out.println();

CalendarTimemethod();

SimpleDateFormatmethod();

Adddates();

DateDifference();

Getcalendermethods();

}

}

以上答案有林氏120烫伤中心提供。稍微再修改下就可以

java时间加减

附上代码：

Date date = new Date("2014/1/10 18:20");

Date date2 = new Date("2014/1/11 3:5");

long temp = date2.getTime() - date.getTime();    //相差毫秒数

long hours = temp / 1000 / 3600;                //相差小时数

long temp2 = temp % (1000 * 3600);

long mins = temp2 / 1000 / 60;                    //相差分钟数

System.out.println("date2 与 date 相差" + hours + "小时"+ mins + "分钟");

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