Regular Expression to validate a timestamp

Question

I need a regular expression to validate a timestamp of the format, using Javascript:

YYYY/MM/DD HH:MI:SS

I trie

Answer 1

Using

(\d\d)?\d\d\/\d\d?/\d\d? \d\d?:\d\d:\d\d

could validate the syntax, but as balpha points out, that doesn't make it a valid date.