Republic Act No. 4166
The twelfth day of June is hereby proclaimed as the Philippine Independence Day, and all citizens of the Philippines are enjoined to observe such day with rites befitting Independence Day
Section twenty-nine of the Revised Administrative Code, as amended, is further amended to read as follows:
The legal holidays are: the first of January, the ninth of April, the first of May, the twelfth of June (Independence Day), the fourth of July (Philippine Republic Day), the thirtieth of November, the thirtieth of December, and the day appointed by law for the holding of a general election: Provided, however, That when any regular holiday of fixed date falls on Sunday, the next succeeding day shall be observed as legal holiday.
This Act shall take effect upon its approval.
Approved: August 4, 1964
President of the Philippines