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External Data Source

Source

Regular Expression
/^(?:(?:0?[13578]|1[02])|(?:0?[469]|11)(?!\/31)|(?:0?2)(?:(?!\/3[01]|\/29\/(?:(?:0[^48]|[13579][^26]|[2468][^048])00|(?:\d{2}(?:0[^48]|[13579][^26]|[2468][^048]))))))\/(?:0?[1-9]|[12][0-9]|3[01])\/(?:0?19|20)\d{2}$/