Summary proceedings for an offence under section one hundred and ten, two hundred and one or two hundred and thirty-three of this Act, an offence under section two hundred and thirty-four thereof consisting in the alteration of an entry made in a record under section one hundred and eighty-six thereof, or an offence under section two hundred and thirty-five or two hundred and thirty-six thereof may be brought—
(a)within a period of six months from the date of the commission of the alleged offence, or
(b)within a period which exceeds neither three months from the date on which it came to the knowledge of the prosecutor that the offence had been committed nor one year from the date of the commission of the offence,
whichever period is the longer.