65 Pa. Stat. § 75
The terms of all public officers elected in odd-numbered years shall hereafter begin on the first Monday of January succeeding their election, instead of the first Monday of December, as prescribed in the schedule to the amendments to the Constitution, adopted November second, one thousand nine hundred and nine: Provided, however, That the terms of the successors to all such officers, elected at the February election in the year one thousand nine hundred and ten, and beginning on the first Monday of December in the proper year, as specified and provided in and by the said schedule, shall be extended until the first Monday of January following the heretofore prescribed end of the respective terms of said several offices: Provided, also, That the terms of the successors to officers whose terms expire in the year one thousand nine hundred and eleven shall begin on the first Monday in December of that year, and shall be extended as follows: The two-year terms, until the first Monday of January in the year one thousand nine hundred and fourteen; the four-year terms, until the first Monday of January in the year one thousand nine hundred and sixteen; and the six-year terms, until the first Monday of January in the year one thousand nine hundred and eighteen.
65 P.S. § 75