The term "Patriots' Day" is a proper noun that names a specific, official holiday. This holiday is legally observed on a fixed day of the week rather than a fixed date: the third Monday in April. Consequently, whether the previous day was Patriots' Day is contingent upon the current date. The statement is only correct if today is the Tuesday immediately following the third Monday of April.
Patriots' Day is a state holiday in Massachusetts and Maine, commemorating the Battles of Lexington and Concord, the first armed conflicts of the American Revolutionary War on April 19, 1775. The observance was originally held on April 19th each year. However, in 1969, Massachusetts moved the holiday to the third Monday in April to create a three-day weekend, a practice Maine later adopted. Wisconsin also recognizes the day as a public school observance.
To verify if yesterday was Patriots' Day, one must consult the calendar for the current year. The necessary step is to identify the date corresponding to the third Monday in April and then compare it to yesterday's date. This process is required because the holiday's status is defined by its specific, regional observance and its non-fixed calendar date.
