Using javascript to calculate the number of days between two dates _ javascript skills

Using javascript to calculate the number of days between two dates ASP can calculate the gap between the two dates DateDiff, but there is no javascript in it and a handwritten function is required.
Js inside can be directly Date1-Date2, and still converted to millisecond time difference calculation.

The Code is as follows:

// Calculate the number of days between two dates
Function DateDiff (sDate1, sDate2) {// The format of sDate1 and sDate2 is 2002-12-18
Var aDate, oDate1, oDate2, iDays
ADate = sDate1.split ("-")
ODate1 = new Date (aDate [1] + '-' + aDate [2] + '-' + aDate [0]) // convert to the 12-18-2002 format
ADate = sDate2.split ("-")
ODate2 = new Date (aDate [1] + '-' + aDate [2] + '-' + aDate [0])
IDays = parseInt (Math. abs (oDate1-oDate2)/1000/60/60/24) // converts the number of milliseconds to the number of days
Return iDays
}