Calculates the number of days between two dates JS code

Source: Internet
Author: User
Tags date1 getdate

One: Calculate the number of days difference between two dates

 The code is as follows Copy Code var s = (new Date (ParamObj.end_date.replace (/-/g, "/"))-(new Date (ParamObj.start_date.replace (/-/g, "/")));var day = s/1000/60/60/24

Example 2

JS can actually directly date1-date2, but also converted to millisecond calculation time difference.

 code is as follows copy code //Two date Interval days   function DateDiff (sDate1, SDate2) {//sdate1 and sDate2 are 2002-12-18 format    var adate, ODate1, ODate2, idays   Adate = Sdate1.split ("-")    ODate1 = new Date (adate[1] + '-' + adate[2] + '- ' + adate[0])//Convert to 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)//Put the difference in milliseconds Convert number to days    return idays   }

Second: Calculate the date after a certain number of days

In JavaScript, count the days after the day's date. Far from being in. NET, a function can solve the problem. On this issue, I was troubled for some time, finally through a Netizen's introduction to solve the problem. Put it together and share it.

 The code is as follows Copy Code

The above 100 represents 100 days after the date that you can modify. JS in Date.gettime (), only after the date of 1970.01.01; there are 0-11 months, a little different, avoid oh. Of course, you can also calculate the date after a specific date.

 The code is as follows Copy Code

If none of the above is calculated for a leap year, the following example is finished

 The code is as follows Copy Code Judge whether it is a leap yearfunction Isleapyear (year) {if (year% 4 = 0 && (year% 100!= 0) | | (Year% 400 = 0)){return true;}return false;}Two dates before and after judgmentfunction Validateperiod (fyear,fmonth,fday,byear,bmonth,bday) {if (Fyear < byear) {return true;}else if (fyear = = byear) {if (Fmonth < Bmonth) {return true;else if (Fmonth = = Bmonth) {if (Fday <= bday) {return true;}else {return false;}} else {return false;}}else {return false;}}Calculate the difference for two datesfunction DateDiff (D1,D2) {var disnum=comparedate (D1,D2);return disnum;}function Comparedate (DATE1,DATE2){var regexp=/^ (d{1,4}) [-|.] {1} (d{1,2}) [-|.] {1} (d{1,2}) \$/;var monthdays=[0,3,0,1,0,1,0,0,1,0,0,1];Regexp.test (date1);var date1year=regexp.\$1;var date1month=regexp.\$2;var date1day=regexp.\$3;Regexp.test (DATE2);var date2year=regexp.\$1;var date2month=regexp.\$2;var date2day=regexp.\$3;if (Validateperiod (Date1year,date1month,date1day,date2year,date2month,date2day)) {Firstdate=new Date (Date1year,date1month,date1day);Seconddate=new Date (Date2year,date2month,date2day);Result=math.floor ((Seconddate.gettime ()-firstdate.gettime ())/(1000*3600*24));for (j=date1year;j<=date2year;j++) {if (Isleapyear (j)) {monthdays[1]=2;}else{monthdays[1]=3;}for (i=date1month-1;i
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