Is there better JavaScript code for validating a string as Date-Time?

Question

I'm using a CustomValidator in an ASP.NET page to validate the text in a TextBox as a Date-Time. I'm expecting pretty much only one format, "MM/DD/YYYY HH:MM PM". The TextBox is usually expecting to be filled by an associated DatePicker, but the user may still freeform it if they want.

Heres' the code, which seems to work. I am looking to see if there is any better JavaScript for this purpose.

function StartDateTimeValidate(source, args)
{
    var d = Date.parse(args.Value);
    if (isNaN(d))
    {
        args.IsValid = false;
    }
}
    </script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="StartDateCalendarTextBox" runat="server" Width="200"></asp:TextBox>
<asp:CustomValidator ID="StartDateCustomValidator" runat="server" 
    ErrorMessage="Bad Date" 
    ClientValidationFunction="StartDateTimeValidate"  
    ValidateEmptyText="false" 
    ControlToValidate="StartDateCalendarTextBox"
    ></asp:CustomValidator>

Damian Senn · Accepted Answer · 2015-05-29 06:05:20Z

1

The builtin JavaScript Date object is based upon a old Java object which is pretty limited.

A lot of projects i run into use moment.js for any date manipulation or validation.

http://momentjs.com/

If you don't want to go with moment.js, your isNaN() approach is probably the best. Otherwise you'd have to write some kind of date parsing yourself to validate the Date.

answered May 29, 2015 at 6:05

Damian Senn

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1 Comment

Cyberherbalist Over a year ago

Thanks for the info on moment.js. I will check it out!

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