Republic Act No. 4166

: RA 4166 changes Philippine Independence Day from July 4 to June 12.
: July 4 is declared as Philippine Republic Day.
: June 12.
: All citizens of the Philippines are enjoined to observe June 12 with rites befitting Independence Day.
: Section 29 of the Revised Administrative Code, as amended.
: Thursday and Friday of Holy Week, Christmas Day, and Sundays are legal religious holidays.
: 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.
: The next succeeding day shall be observed as the legal holiday.
: It both proclaims June 12 as Independence Day and amends Section 29 of the Revised Administrative Code to include it among legal holidays.
: It takes effect upon its approval.
: Independence Day is moved to June 12, while July 4 is retained in the calendar but redesignated as Philippine Republic Day.
: July 4 remains a holiday but changes designation from Independence Day to Philippine Republic Day, and it is still listed as a legal holiday in Section 29.
: The next succeeding day shall be observed as the legal holiday.
: All three are included: May 1, April 9, and July 4 (as Philippine Republic Day).