Commonwealth Act No. 91

: The standard time of the Philippines is fixed upon the basis of the mean astronomical time at one hundred and twenty degrees East Longitude, Greenwich Meridian.
: The President of the Philippines has the authority to establish a daylight saving time.
: The President may establish daylight saving time within the periods from March to June and from November to January, all inclusive.
: The President implements daylight saving time by proclamation, advancing the standard time by one hour on a date he determines, and retarding it by one hour on another date he determines, effectively making the standard time one hour in advance during certain periods.
: The President must fix the date and hour when the daylight saving time shall commence and terminate.
: No, daylight saving time is only established during certain periods as determined by the President and the time reverts back after these periods.
: The movement of all common carriers is governed by the standard or daylight saving time established.
: In all statutes, orders, rules, and regulations relating to the time of performance of acts or rights, the time shall be understood as the standard or daylight saving time as established by this law.
: The Act took effect upon its approval on October 26, 1936.
: No, Commonwealth Act No. 91 does not provide any penalty provisions for non-compliance.