It does not check for leap years or invalid dates at the end of short months.
As we've seen before, creating re-usable functions can significantly reduce the size of your Java Script code.
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').
The time field will allow input starting with 'hh:mm' following by an optional 'am' or 'pm'. The code behind the form is as follows: For each field in the form (first the dates, then the time field), a check is made as to whether the input is blank.
There have been so many problems with users not entering the date in mm/dd/yyyy, even when specifically stated on the screen.Its good practice to validate form date values using client side Java Script validation along with your programming language validation.The following example shows how you can do this for the mm/dd/yyyy format.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.