(([1-9]|[0-2]\d|[3][0-1])\.([1-9]|[0]\d|[1][0-2])\.[1-9][0-9]\d{2}\s([1-9]|[0-1]\d|[2][0-3])\:[0-5]\d\:[0-5]\d)$
(([1-9]|[0-2]\d|[3][0-1])\.([1-9]|[0]\d|[1][0-2])\.[1-9][0-9]\d{2}(\s([1-9]|[0-1]\d|[2][0-3])\:[0-5]\d\:[0-5]\d)){0,1}$
# samo datum
# datum i vrijeme korektno
(([1-9]|[0-2]\d|[3][0-1])\.([1-9]|[0]\d|[1][0-2])\.[1-9][0-9]\d{2}(\s([1-9]|[0-1]\d|[2][0-3])\:[0-5]\d(\:[0-5]\d){0,1}){0,1})$

([1-9][0-9]\d{2}-([1-9]|[0]\d|[1][0-2])-([1-9]|[0-2]\d|[3][0-1])(\s([1-9]|[0-1]\d|[2][0-3])\:[0-5]\d(\:[0-5]\d){0,1}){0,1})$