Title
Supreme Court
Philippine Standard and Daylight Saving Time Law
Law
Commonwealth Act No. 91
Decision Date
Oct 26, 1936
Commonwealth Act No. 91 establishes the standard time of the Philippines based on mean astronomical time, allowing the President to establish daylight savings time during certain periods, which governs the movement of common carriers and applies to all statutes, orders, rules, and regulations related to timing.

Law Summary

Presidential Authority to Establish Daylight Saving Time

  • The President of the Philippines may, by proclamation, implement daylight saving time (DST).
  • DST can be established during the periods from March to June and from November to January.
  • Implementation involves advancing the standard time by one hour on a date determined by the President.
  • The President must also determine when to revert the time by one hour to terminate DST.
  • The proclamation must specify the exact date and hour for the commencement and termination of DST.

Legal Effect of Standard and Daylight Saving Time

  • The established standard or daylight saving time governs the operations of all common carriers.
  • In all legal contexts—statutes, orders, rules, regulations—pertaining to the timing of actions by government officers or departments, the time reference is the established standard or daylight saving time.
  • This includes the determination of the accrual or expiration of rights and deadlines for any acts to be performed by persons within the Philippines.

Effectivity of the Act

  • The Act takes effect immediately upon its approval on October 26, 1936.

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