Howto detect if typed date is valid

1. Riddle: catch the bug.

   isValidDate('30/08/2012', '/', 'dmy') == true
   isValidDate('29/02/2000', '/', 'dmy') == true
   isValidDate('10/10/1580', '/', 'dmy') == true
   isValidDate('29/02/2001', '/', 'dmy') == false
   isValidDate('10/10/1582', '/', 'dmy') == true
   isValidDate('10/12/2121', '/', 'dmy') == true
   isValidDate('10/10/2000', '/', 'dmy') == true
   

   where is the function lack?

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   1. Hi Giacomo,
      trying the following code:

      Hi Giacomo,
      trying the following code:

      var_dump(validaData('30/08/2012', '/', 'dmy')); # bool(true)
      var_dump(validaData('29/02/2000', '/', 'dmy')); # bool(true)
      var_dump(validaData('10/10/1580', '/', 'dmy')); # bool(true)
      var_dump(validaData('29/02/2001', '/', 'dmy')); # bool(false)
      var_dump(validaData('10/10/1582', '/', 'dmy')); # bool(true)
      var_dump(validaData('10/12/2121', '/', 'dmy')); # bool(true)
      var_dump(validaData('10/10/2000', '/', 'dmy')); # bool(true) 
      

      the output is as expected. So… where is the bug? :)

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2. Think: which was the day after 4th October 1582 ?

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   1. It was the October, 5th 1582, not? :)

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3. no, it wasn’t!
   the day after 4th october, was 15th october, according to Gregorian calendar.

   ….but ….

   …but…. there are many consideration we could do. (i.e. Swedish Reign used Giulian (Assange) calendar till 1699)

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   1. touche! :)

      Thanks Giacomo! As you can notice, I’ve changed the script.

      Caricamento...

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