悄悄的问! 根据今天的日期求昨天的日期？？在线等

[vbscript1981]

如题？
比如!今天是2004-10-13
那么得到2004-10-12

[MARS.nEIL]

有个函数,减1就是了.

[MARS.nEIL]

<SCRIPT LANGUAGE="JavaScript">
<!--
//说明:这里用了Math.ceil()函数,向上取整,即零头算一天,^_^
var strDate1 = "2003-06-17 03:03:40.0";
var strDate2 = "2004-09-18 12:03:12.0";
strDate1=strDate1.substring(0,strDate1.lastIndexOf(".")).replace(/-/g,"/");
strDate2=strDate2.substring(0,strDate2.lastIndexOf(".")).replace(/-/g,"/");
var date1 = Date.parse(strDate1);
var date2 = Date.parse(strDate2);
alert("strDate2与strDate1相差"+Math.ceil((date2-date1)/(24*60*60*1000))+"天")
//-->
</SCRIPT>

<SCRIPT LANGUAGE="JavaScript">
<!--

var strDate1 = "2004-09-17 03:03:00.0";
var strDate2 = "2004-09-17 04:05:00.0";
strDate1=strDate1.substring(0,strDate1.lastIndexOf(".")).replace(/-/g,"/");
strDate2=strDate2.substring(0,strDate2.lastIndexOf(".")).replace(/-/g,"/");
var date1 = Date.parse(strDate1);
var date2 = Date.parse(strDate2);
alert("strDate2与strDate1相差"+(date2-date1)/(60*60*1000)+"小时")
//-->
</SCRIPT>

[wangjm02]

Calendar.set(Calendar.DATE, -1);

[MARS.nEIL]

上面这个是日期相减的.

[wangjm02]

Calendar应该为表示今天的Calendar类的实例


Calendar today = Calendar.getInstance();
today.set('2004','10','12');
Calendar yesterday = today.set(Calendar.DATE,-1);

[yunxiang]

Date d=new Date();
d.setTime(new Date().getTime()-86368409);
System.out.println(d);

[边城狂人]

/*
* @(#) Test.java
* Created on 2004-9-21
* Created by James Fancy
*/
package jamesfancy;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;


/**
* @author James Fancy
*/
public final class Test {

public static void main(String[] args) {
Calendar cale = new GregorianCalendar(2004, 10, 13);
cale.add(Calendar.DATE, -1);
System.out.println(new SimpleDateFormat("yyyy-MM-dd").format(cale.getTime()));
}

}

[vbscript1981]

哈哈! 我也做出来!我的做法是这样的!
public String getyestodydate() {
String yestodytimestr = "" ;
try {
java.util.Calendar cal = Calendar.getInstance();

java.text.DateFormat df = new java.text.SimpleDateFormat("yyyy-M-d") ;
cal.roll(Calendar.DATE,-1);
yestodytimestr=df.format(cal.getTime());

}
catch (Exception ex) {
}
return yestodytimestr ;
}

[jein]

时间日期可以减的啊，减一天不就是昨天的日期了吗