JavaScript mimics the code _ time date of the DATEADD () function in the VBS

The project needs to use the calendar,. NET calendar control is too heavy, had to write with JS, the core function of the calendar is DateAdd (), the writing process found in JS inside operation time than the imagination of tedious, not like VBScript can easily DateAdd, and then think of using setFullYear (), setdate () and other built-in functions, you can flatten a JS version of the DATEADD (), the code is as follows:

Copy Code code as follows:

function DateAdd (interval,number,date) {//date can be either a time object or a string, and if it is the latter, the form must be: Yyyy-mm-dd Hh:mm:ss where the delimiter is indeterminate. "December 29, 2006 16:01 23 seconds" is also legal.
Number = parseint (number);
if (typeof (Date) = "string") {
Date = Date.split (/\d/);
--DATE[1];
Eval ("var date = new Date (" +date.join (",") + ")");
}
if (typeof (date) = = "Object") {
var date = Date
}
Switch (interval) {
Case "Y": Date.setfullyear (Date.getfullyear () +number); Break
Case "M": Date.setmonth (Date.getmonth () +number); Break
Case "D": Date.setdate (Date.getdate () +number); Break
Case "W": Date.setdate (Date.getdate () +7*number); Break
Case "H": Date.sethours (Date.gethour () +number); Break
Case "n": Date.setminutes (Date.getminutes () +number); Break
Case "S": Date.setseconds (Date.getseconds () +number); Break
Case "L": Date.setmilliseconds (Date.getmilliseconds () +number); Break
}
return date;
}

This function has tried to mimic the DateAdd function in VBScript, three parameters, the first is the change time interval, can be year, month, day, week, time, minute, second, millisecond (extension), the third parameter can be a time object, or a string (in the form must be: 2006-12-29 14:32:57 or December 29, 2006 14:32 57 seconds), the return value of the function is the new time object.