Validating a date in javascript

Now the date string is seperated into the month, day and year integers.

They are each validated seperately and combined together.

By Tom Flynn, Sun Gard Higher Education, and Jeralee Seaburn, Hercules Tire Problem: Started in a Focal Point post, the question is, how to validate Date (calendar) controls in a guided ad-hoc HTML page?

There have been so many problems with users not entering the date in mm/dd/yyyy, even when specifically stated on the screen.

Solution: Tom Flynn from Sun Gard Higher Education provided the following Jave Script, which helped resolving the issue, so many thanks to Tom!

function Validate Form(ctrl) //-------------------------------------------------------------------------- //This function verifies if the start date is prior to end date.

The output will be almost identical to the earlier examples.

In this simple example we can even rewrite the In practice most modern browsers will now use HTML form validation to preempt any Java Script validation - with the notable exception of Safari. Visitors from some countries may find it confusing that we're using the and vice-versa as the year and day values have now changed position.

Basically, for each of the regular expression tests, an array is returned holding each component of the pattern that we've matched.

We have also provided the javascript date validation for the dd/mm/yyyy format.

If the valid date character is changed please make sure you replace it in the HTML and Javascript code too.

In Java Script to check for different month lengths, particularly for February in leap years, you need quite a bit of extra code.

I'm not going to show that here, but you can find a link to get started under References below.

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In this example, the date fields will only accept input that matches the pattern 'dd/mm/yyyy' (this could just as easily be changed to 'yyyy-mm-dd' or 'mm/dd/yyyy').

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