N.Y. Gen. Constr. Law § 24
The term public holiday includes the following days in each year: the first day of January, known as New Year's day; the third Monday of January, known as Dr. Martin Luther King, Jr. day; the twelfth day of February, known as Lincoln's birthday; the third Monday in February, known as Washington's birthday; the last Monday in May, known as Memorial day; the second Sunday in June, known as Flag day; the nineteenth day of June, known as Juneteenth; the fourth day of July, known as Independence day; the first Monday in September, known as Labor day; the second Monday in October, known as Columbus day; the eleventh day of November, known as Veterans' day; the fourth Thursday in November, known as Thanksgiving day; and the twenty-fifth day of December, known as Christmas day, and if any of such days except Flag day is Sunday, the next day thereafter; each general election day, and each day appointed by the president of the United States or by the governor of this state as a day of general thanksgiving, general fasting and prayer, or other general religious observances. The term half-holiday includes the period from noon to midnight of each Saturday which is not a public holiday.
N.Y. Gen. Constr. Law § 24