JS date addition and subtraction, date calculation code, js date

JS date addition and subtraction, date calculation code, js date

1. date minus the number of days equals to the second date

Function cc (dd, dadd) {// you can add error processing var a = new Date (dd) a =. valueOf () a = a-dadd * 24*60*60 * 1000a = new Date (a) alert (. getFullYear () + "year" + (. getMonth () + 1) + "month" +. getDate () + "day")} cc ("12/23/2002", 2)

I have to add some resources here, wasting a lot of time to draw lessons:
Time code of Javascript
0-11: The number is 1-12 months. var a = new Date (, 6). The result is-6.
0-6 indicates the week
1-31 represents the date
0-23 hours
0-59 minutes, seconds

II. // Difference between two dates (d1-d2 ).

function DateDiff(d1,d2){  var day = 24 * 60 * 60 *1000;try{      var dateArr = d1.split("-");  var checkDate = new Date();    checkDate.setFullYear(dateArr[0], dateArr[1]-1, dateArr[2]);  var checkTime = checkDate.getTime();   var dateArr2 = d2.split("-");  var checkDate2 = new Date();    checkDate2.setFullYear(dateArr2[0], dateArr2[1]-1, dateArr2[2]);  var checkTime2 = checkDate2.getTime();    var cha = (checkTime - checkTime2)/day;     return cha;  }catch(e){  return false;}}//end fun

Iii. application:

<Script language = "javascript" type = "text/javascript"> var flag = Array (); // global variable var start = "2009-01-01"; var end = "2009-02-24 "; setFlag (start, end); for (var I = 0; I <flag. length; I ++) {document. write (flag [I] + "\ n \ r");} // set the date (array) function SetFlag (start, end) in the cycle) {var cdate = Array (); cdate = start. split ("-"); var cd = cdate [1] + "/" + cdate [2] + "/" + cdate [0]; var dayNum = DateDiff (end, start); for (var I = 0; I <= dayNum; I ++) {flag. push (AddDays (cd, I) ;}// end fun // the new date after the date plus the number of days. function AddDays (date, days) {var nd = new Date (date); nd = nd. valueOf (); nd = nd + days * 24*60*60*1000; nd = new Date (nd); // alert (nd. getFullYear () + "year" + (nd. getMonth () + 1) + "month" + nd. getDate () + "day"); var y = nd. getFullYear (); var m = nd. getMonth () + 1; var d = nd. getDate (); if (m <= 9) m = "0" + m; if (d <= 9) d = "0" + d; var cdate = y + "-" + m + "-" + d; return cdate;} // The difference between the two dates (d1-d2 ). function DateDiff (d1, d2) {var day = 24*60*60*1000; try {var dateArr = d1.split ("-"); var checkDate = new Date (); checkDate. setFullYear (dateArr [0], dateArr [1]-1, dateArr [2]); var checkTime = checkDate. getTime (); var dateArr2 = d2.split ("-"); var checkDate2 = new Date (); checkDate2.setFullYear (dateArr2 [0], dateArr2 [1]-1, dateArr2 [2]); var checkTime2 = checkDate2.getTime (); var cha = (checkTime-checkTime2)/day; return cha ;}catch (e) {return false ;}} // end fun </script>