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I have the following problem.
I'm not able to modify all dates older than the day 13.

For example:
With the date 07/01/2013 11:20:00 I am able to change the format. To 07/01/2013 11:20 a.m.
But with 07/13/2013 00:00:00 or over the 13, I'm not able to change it to anything.

Even if I manually change the format, the date won't change.
Do you know what could be wrong?

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Check you locale settings. Your Excel setup is using DD/MM/YYYY format, which is common outside the US. –  Mike Fitzpatrick Aug 15 '13 at 1:13
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