La. Civ. Code art. 3455
Current with operative changes from the 2024 Third Special Legislative Session
If the prescriptive period consists of one or more months, prescription accrues upon the expiration of the day of the last month of the period that corresponds with the date of the commencement of prescription, and if there is no corresponding day, prescription accrues upon the expiration of the last day of the period.
La. C.C. § 3455