/^
(([12][\d])?[\d]{2})?
(
(0[1-9]|1[0-2])
(0[1-9]|[12][0-9]|3[01])
([01][0-9]|2[0-4])
([0-5][\d]|60)
){1}
(.([0-5][\d]|60))?
$/
