Processing date in JS

These days have been entangled in various conversions of dates. Now, we have finally solved this problem. By the way, we have contributed to our achievements over the past few days and have grown together with everyone.

1. convert a date string to a date object.
A string in the format of yyyy-mm-dd is converted to a date object. You can use new date (date. parse (Str. Replace (/-/g ,"/")));
As follows:
VaR enddatestr = endyear + "-" + endmonth + "-" + endday;
Enddate = new date (date. parse (enddatestr. Replace (/-/g ,"/")));
Instance display:
Enddatestr: "2010-5-20"
Date. parse (enddatestr. Replace (/-/g, "/"): 1274284800000
Enddate: Thu May 20 00:00:00 UTC + 0800 2010

The format yyyy/mm/DD is converted into a date object. You can use new date (STR );
As follows:
VaR enddatestr = endyear + "/" + endmonth + "/" + endday;
Enddate = new date (enddatestr );
Instance display: "2010/5/20", Thu May 20 00:00:00 UTC + 0800 2010

The format yyyymmdd is converted to a date object. You can use new date (sdate. replace (/^ (\ D {4}) (\ D {2}) (\ D {2}) $ /, "$1/$2/$3 "));
As follows:
VaR sdate = "20090516 ";
Sdate = sdate. replace (/^ (\ D {4}) (\ D {2}) (\ D {2}) $/, "$1/$2/$3 ");
New Date (sdate );
Instance display: "2009/05/16", sat May 16 00:00:00 UTC + 0800 2009

2. display the next day of the current date.
VaR date = new date ();
VaR B = date. getdate ();
B + = 1;
Date. setdate (B );

3. Calculate the number of days between two dates.
VaR date1 = new date (0800, 28); // Mon Jul 28 00:00:00 UTC + 2008
VaR date2 = new date (2009, 5, 16); // Tue Jun 16 00:00:00 UTC + 0800 2009
VaR n = (date2.gettime ()-date1.gettime ()/(24*60*60*1000); // 323
VaR n = (Date2-Date1)/(24*60*60*1000); // directly subtract the number of milliseconds.

4. dateobj. getday () returns the date value of the Week represented by the local time in the date object.
The value returned by the getday method is an integer between 0 and 6. It represents a day in a week. The relationship between the return value and the date in a week is as follows:

Week
0 Sunday
1 Monday
2 Tuesday
3. Wednesday
4 Thursday
Friday
6. Saturday

This method can be used to determine 'workday.