(1) A charge-sheet is not invalid by reason only of a failure to comply with Schedule 1.
(2) A charge on a charge-sheet is not invalid by reason only of—
(a) omitting to state the time at which the offence was committed unless time is an essential element of the offence; or
(b) incorrectly stating the time at which the offence was committed; or
(c) stating the offence to have been committed on an impossible day or on a day that never happened.