Related for Rosh Hashanah 14:4
ואפילו למאן דאמר יום אחד בשנה חשוב שנה שאני הכא דלא טרח איניש למיגר ביתא לבציר מתלתין יומין
on the first of Adar, as soon as the first of Nisan arrives,<span class="x" onmousemove="('comment',' I.e., as soon as thirty days have passed.');"><sup>4</sup></span> a year has been completed.'
Tosefta Rosh Hashanah (Lieberman)
How [one should understand]: "for house rent"? [Answer:] If he rents a house to another for a year, he counts twelve months from the day he started renting it to him. But if he says: For this year, even if he rented it from him only on the first of Adar, he owns it only up to the first of Nisan.
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