Section 236.50 - Date chapter applies; curative provisions as to plats before that date(1)(a) This chapter shall take effect upon July 1, 1956, but any plat recorded prior to December 31, 1956, may be approved and recorded in accordance with this chapter or ch. 236, 1953 stats. This chapter shall not require that any subdivision made prior to July 1, 1956, which was platted under the laws in force at that time or which did not constitute a subdivision under the laws in force at that time, be platted and the plat approved and recorded as provided in this chapter.(b) This chapter shall not require the preparation and recording of a plat of any subdivision which has been staked out and in which sales or contracts of sales have actually been made prior to June 28, 1935, and nothing herein contained shall require the recording of a plat showing property sold or contracted for sale by metes and bounds or by reference to an unrecorded plat prior to June 28, 1935, as a condition precedent to the sale or contract of sale of the whole or part thereof.(2) No plat which was recorded in the office of any register of deeds prior to July 1, 1956, shall be held invalid by reason of noncompliance with any statute regulating the platting of lands, in force at the time of such recording. Any unaccepted offer of donation or dedication of land attempted to be made in any such plat shall be as effectual as though all statutory requirements had been complied with unless an action to set aside such offer of donation or dedication is commenced prior to July 1, 1958.