Javascript implements date difference calculation

This article mainly introduces the example explanation of javascript date subtraction. The code is attached for everyone to view. Friends in need can refer to it

The code is as follows:

<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>

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