JavaScript Date processing function encyclopedia (1/7)

。 Solve 2000 problems

function y2k (number) {return (number < 1000) number + 1900:number;}

2. Check whether the date is legal

When the input parameter is IsDate (DD,MM,CCYY), it means to check the year, month, day

When the input parameter is IsDate (DD,MM) indicates the default year is when

When the input parameter is IsDate (DD) indicates the default year, the month is the current date

Note that the input month is guaranteed to be within 1-12.

function IsDate (day,month,year) {

var today = new Date ();

Year = ((!year)-Y2K (Today.getyear ()) year);

Month = ((!month)? Today.getmonth (): month-1);

if (!day) return False

var test = new Date (year,month,day);

if ((Y2K (test.getyear ()) = = year) &&

(Month = = Test.getmonth ()) &&

(Day = = Test.getdate ()))

return true;

Else

return False

}

The following is an example of an invocation:

if (IsDate (31,2,1997))

document.write ("valid");

Else

document.write ("invalid");

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