JavaScript detects date time format is correct code

In web development, often with datetime, sometimes we need users to provide date and time data, in order to ensure the smooth submission, we need to validate the user input date and time format, the user will be prompted to check and re-enter, the following code to determine the date format, Date time format is correct.
First: Only determine if the date format is correct and does not take time:

The code is as follows	Copy Code
<script language=javascript> String.prototype.isDate = function () { var r = This.match (/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2}) $/); if (r==null) return false; var d = new Date (r[1], r[3]-1, r[4]); Return (D.getfullyear () ==r[1]&& (D.getmonth () +1) ==r[3]&&d.getdate () ==r[4]); } Alert ("2002-01-31". IsDate ()); Alert ("2002-01-41". IsDate ()); </script>

the second is to determine whether the date + time format is correct:
　

The code is as follows

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<script language=javascript> String.prototype.isTime = function () { var r = This.match (/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2); if (r==null) return false; var d = new Date (r[1], r[3]-1,r[4],r[5],r[6],r[7]); Return (D.getfullyear () ==r[1]&& (D.getmonth () +1) ==r[3]&&d.getdate () ==r[4]&&d.gethours () = =r[5]&&d.getminutes () ==r[6]&&d.getseconds () ==r[7]); } Alert ("2002-1-31 12:34:56". Istime ()); Alert ("2001-2-29 12:54:56". Istime ()); Alert ("2002-1-41 12:00:00". Istime ()); </script>

the third is to determine whether the date is valid

1 short time, form (13:04:06)

The code is as follows

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function Istime (str) { var a = Str.match (/^ (\d{1,2}) (:)? \d{1,2}) \2 (\d{1,2}) $/); if (a = = null) {alert (' input parameter is not a time format '); return false;} if (a[1]>24 | | a[3]>60 | | a[4]>60) { Alert ("Time format is not"); return False } return true; } 2. Short date, form (2008-07-22) function Strdatetime (str) { var r = Str.match (/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2}) $/); if (r==null) return false; var d= new Date (r[1], r[3]-1, r[4]); Return (D.getfullyear () ==r[1]&& (D.getmonth () +1) ==r[3]&&d.getdate () ==r[4]); } 3 long time, shaped like (2008-07-22 13:04:06) function Strdatetime (str) { var reg =/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2}) $/; var r = Str.match (reg); if (r==null) return false; var d= new Date (r[1], r[3]-1,r[4],r[5],r[6],r[7]); Return (D.getfullyear () ==r[1]&& (D.getmonth () +1) ==r[3]&&d.getdate () ==r[4]&&d.gethours () = =r[5]&&d.getminutes () ==r[6]&&d.getseconds () ==r[7]); }

the fourth is to determine whether the date format is valid

code is as follows

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function todatefromstring (strdate) { if (strdate.length!= 8) { RET Urn null; } var dtdate = null; var nyear = parseint (strdate.substring (0, 4); var nmonth = parseint (strd Ate.substring (4, 6), 10); var nday = parseint (strdate.substring (6, 8), 10); if (isNaN (nyear) = = True | | isNaN (nmonth) = = True | | isNaN (nday) = = True) { return null; } Dtdate = new Date (nyear, nMonth-1, nday); if (nyear!= dtdate.getfullyear () | | (nMonth-1)!= dtdate.getmonth () | | Nday!= dtdate.getdate ()) { return null; } return dtdate; } YYYYMMDD format