Validation (Date) - JavaScript Made Easy: Free JavaScripts Tutorials Example Code

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Validation (Date)

Use Javascript to figure out if a certain date has or will be valid. Enter a date in format: MM/DD/YY


Insert into <HEAD>
<Script LANGUAGE="JavaScript"> <!-- By Mattias Sjsberg 11-28-96 function checkdate() { var err = 0 string = document.frm.dat.value var valid = "0123456789/" var ok = "yes"; var temp; for (var i=0; i< string.length; i++) { temp = "" + string.substring(i, i+1); if (valid.indexOf(temp) == "-1") err = 1; } if (string.length != 8) err=1 b = string.substring(0, 2) // month c = string.substring(2, 3)// '/' d = string.substring(3, 5) // day e = string.substring(5, 6)// '/' f = string.substring(6, 8) // year if (b<1 \|\| b>12) err = 1 if (c != '/') err = 1 if (d<1 \|\| d>31) err = 1 if (e != '/') err = 1 if (f<0 \|\| f>99) err = 1 if (b==4 \|\| b==6 \|\| b==9 \|\| b==11){ if (d==31) err=1 } if (b==2){ var g=parseInt(f/4) if (isNaN(g)) { err=1 } if (d>29) err=1 if (d==29 && ((f/4)!=parseInt(f/4))) err=1 } if (err==1) { alert('I Don\'t Think So!'); } else { alert('Seems Alright!'); } } //--> </Script>

Insert into <BODY>
<CENTER> Enter a date in format: MM/DD/YY <FORM name="frm"> <input type=text name=dat value="MM/DD/YY"> <input type=button name="chk" value="Check it!" onClick="checkdate()"> </FORM> </CENTER>

Other Options