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External Data Source

Source

Regular Expression
^(?=0?[1-9]/|1[012]/)(?:(?<month>(?<month31days>0?[13578]|1[02])|(?<month30days>0?[469]|11)|(?<monthFeb>0?2))/)(?<day>(?(month31days)(?:[012]?[1-9]|3[01]))(?(month30days)(?:[012]?[1-9]|30))(?(monthFeb)(?:[01]?[1-9]|2(?(?=\d/(?:(?:(?:04|08|12|16|20|24|28|32|36|40|44|48|52|56|60|64|68|72|76|80|84|88|92|96)00)|(?:\d\d(?:04|08|12|16|20|24|28|32|36|40|44|48|52|56|60|64|68|72|76|80|84|88|92|96))))[0-9]|[0-8]))))/(?<year>(?!0000)\d{4})$