Date Validataion

I need to validate whether the given input is a valid date.
I using Text box.
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What's a valid date?
13 Jan 2000?
Thu Jan 13 2000?
Thu Jan 13 10:50:00 GMT 2000?
Don 13 Jan 10:50:00 2000?
Gio 13 Gen 10:50:00 2000?
JDN 2451557?
5760 Shevat 6?
8 Eb, 0 Muan?
If IsDate(textbox) then
          'do something
end if

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