JavaScript function to automatically add slashes to date

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In converting an old Windows app to a browser app, the user wanted to be able to enter dates without the slashes. Here's a simple jscript:

   1: // Function to convert short date string (MMddyy)
   2: // or (MMddyyyy) to a date string (mm/dd/yyyy).
   3: // txtBox is the actual textbox control
   4: // with the value to be processed.
   5: function FixShortDate(txtBox) {
   6:     if (txtBox == null) { 
   7:         return '' }
   8:  
   9:     var re = new RegExp(/(\d{6})(\d{2})?/);
  10:  
  11:     if (re.test(txtBox.value))
  12:     {
  13:         if (txtBox.value.length == 8) {
  14:             txtBox.value = txtBox.value.substring(0, 2) + '/' + txtBox.value.substring(2, 4) + '/' + txtBox.value.substring(4, 8)
  15:         }
  16:         
  17:         if (txtBox.value.length == 6) {
  18:             if (txtBox.value.substring(4, 6) < 20)
  19:             {
  20:                 txtBox.value = txtBox.value.substring(0, 2) + '/' + txtBox.value.substring(2, 4) + '/20' + txtBox.value.substring(4, 6);
  21:             }
  22:             else
  23:             {
  24:                 txtBox.value = txtBox.value.substring(0, 2) + '/' + txtBox.value.substring(2, 4) + '/19' + txtBox.value.substring(4, 6);
  25:             }
  26:         }
  27:     }
  28:     return txtBox.value;
  29: }

I simply add the call to the onBlur event and we're off to the races.

   1: Enter your date:
   2: <input type="text" id="testdate" onblur="FixShortDate(this)" />

I've chosen 2020 as my cutoff year so anything 033120 will be 03/31/1920 while 033119 will be 03/31/2019.

Hope you enjoy.

Comments

Anonymous said…
Thank you!
I had the exact same request and your code came very handy.
January 17, 2011 at 4:28 AM
Unknown said…
Dear,

Thanks a lot for sharing such nice code with us.... Thnx a lot....
March 8, 2013 at 6:27 AM
Anonymous said…
helped me in coding......
Thank you.
August 27, 2015 at 8:20 AM
Anonymous said…
Thank you! This helped me a lot!! :)
November 18, 2020 at 2:28 AM
Anonymous said…
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December 7, 2022 at 6:15 AM
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