how to validate date input in javascript

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Cassidy
09 Jan 2017
1var date_regex = /^(0[1-9]|1[0-2])\/(0[1-9]|1\d|2\d|3[01])\/(19|20)\d{2}$/;
2if (!(date_regex.test(testDate))) {
3    return false;
4}
source
Salomé
21 May 2016
1
2function validatedate(inputText,DateFormat)
3{
4// format dd/mm/yyyy or in any order of (dd or mm or yyyy) you can write dd or mm or yyyy in first or second or third position ... or can be slash"/" or dot"." or dash"-" in the dates formats
5var invalid = "";
6var dt = "";
7var mn = "";
8var yr = "";
9var k;
10var delm = DateFormat.includes("/") ? "/" : ( DateFormat.includes("-") ? "-" : ( DateFormat.includes(".") ? "." : "" ) ) ;
11var f1 = inputText.split(delm);
12var f2 = DateFormat.split(delm);
13for(k=0;k<=2;k++)
14{ 
15 dt = dt + (f2[parseInt(k)]=="dd" ? f1[parseInt(k)] : "");
16 mn = mn + (f2[parseInt(k)]=="mm" ? f1[parseInt(k)] : "");
17 yr = yr + (f2[parseInt(k)]=="yyyy" ? f1[parseInt(k)] : "");
18}
19var mn_days = "0-31-" + (yr % 4 == 0 ? 29 : 28) + "-31-30-31-30-31-31-30-31-30-31";
20var days = mn_days.split("-");
21if( f1.length!=3 || mn.length>2 || dt.length>2 || yr.length!=4 || !(parseInt(mn)>=1 && parseInt(mn)<=12) || !(parseInt(yr)>=parseInt(1900) && parseInt(yr)<=parseInt(2100)) || !(parseInt(dt)>=1 && parseInt(dt)<=parseInt(days[parseInt(mn)])) )
22{
23 invalid = "true";
24}
25alert( ( invalid=="true" ? "Invalid Date" : "Valid Date")  );
26}
27
28
source
Juan Sebastián
21 Jul 2016
1function isValidDate(d){
2    return !isNaN((new Date(d)).getTime());
3}
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