N.H. Rev. Stat. Ann. § 21:8
The word "month" shall mean a calendar month, and the word "year" a calendar year, unless otherwise expressed; and the word "year" shall be equivalent to the expression "year of our Lord."
Source. RS 1:7. CS 1:7. CS 1:8. GL 1:8. PS 2:8. PL 2:8. RL 7:8.