The PST was established decades ago under the auspices of DOST’s  Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) but was never strictly enforced. DOST-PAGASA has been the country’s official timekeeper since 1978 per Section 6 of Batas Pambansa Blg. 8.

The PST is set via DOST-PAGASA’s timing system that consists of rubidium atomic clock, Global Positioning System receiver, time interval counter, distribution amplifier, and a computer. The system automatically calculates its time difference with every satellite within its antenna’s field of view. The PST is available online at the DOST-PAGASA website (http://www.pagasa.dost.gov.ph).

Official launch of Juan Time will be on 30 September at the Music Hall of the SM Mall of Asia. Partnering with DOST in this nationwide campaign are the Metro Manila Development Authority, SM Supermalls, Nido Fortified Science Discovery Center, Team Manila, Lamoiyan Corporation, and Discovery Channel.

A pre-event featuring exhibits and a fashion show was held 23 September  at the iMAX Ground Floor, Lobby Lounge, SM Mall of Asia.  The show, hosted by Tessa Prieto-Valdes, had surprise celebrity guests, including the 2011 Miss Earth winners, to help reinforce the message that Filipino time is now on time.