Philippine Standard Time (Filipino: Pamantayang Oras ng Pilipinas, abbreviated PST or PhST), also known as Philippine Time (PHT), is the official name for the time in the Philippines. The country only uses one time zone (UTC+08:00), and for a short period, it also used daylight saving time.
Geographically, the Philippines lies within 116°40? and 126°34? east of the Prime Meridian, and is physically located within the UTC+08:00 time zone. Philippine Standard Time is maintained by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA). The Philippines shares the same time zone with China, Taiwan, Hong Kong, Macau, Malaysia, Singapore, Western Australia, Brunei, Irkutsk, Central Indonesia and most of Mongolia.
Philippine Standard Time was instituted through Batas Pambansa Blg. 8 (that defined the metric system), approved on 2 December 1978 and implemented on 1 January 1983. The Philippines is one of the few countries to officially and almost exclusively use the 12-hour clock in non-military situations.[dubious ]
From 1521 to 1844, the Philippines had the same date as Mexico, because it had been a Spanish colony supplied and controlled via Mexico until Mexico's independence in the 1820s. Monday, 30 December 1844 was immediately followed by Wednesday, 1 January 1845, which added 1 day or 24 hours to the local time. This meant that International Date Line moved from going west of the Philippines to go on the east side of the country. At the time, local mean time was used to set clocks, meaning that every place used its own local time based on its longitude, because the time was measured by locally observing the sun.
|Period in use||Time offset from GMT||Name of time|
|before 30 December 1844||UTC-15:56 (in Manila)||local mean time|
|UTC-16:02 (in Balabac, the westernmost island)|
|UTC-15:33 (in Davao Oriental, the easternmost area)|
|1 January 1845 - 10 May 1899||UTC+08:04 (in Manila)||local mean time|
|UTC+07:58 (in Balabac, the westernmost island)|
|UTC+08:27 (in Davao Oriental, the easternmost area)|
|11 May 1899 - 31 October 1936||UTC+08:00||Philippine Standard Time|
|1 November 1936 - 31 January 1937||UTC+09:00||Philippine Daylight Time|
|1 February 1937 - 30 April 1942||UTC+08:00||Philippine Standard Time|
|1 May 1942 - 31 October 1944||UTC+09:00||Tokyo Standard Time|
|1 November 1944 - 11 April 1954||UTC+08:00||Philippine Standard Time|
|12 April 1954 - 30 June 1954||UTC+09:00||Philippine Daylight Time|
|1 July 1954 - 21 March 1978||UTC+08:00||Philippine Standard Time|
|22 March 1978 - 20 September 1978||UTC+09:00||Philippine Daylight Time|
|21 September 1978 - 20 May 1990||UTC+08:00||Philippine Standard Time|
|21 May 1990 - 28 July 1990||UTC+09:00||Philippine Daylight Time|
|29 July 1990 - present||UTC+08:00||Philippine Standard Time|
Television and radio stations in the Philippines display the time, but varied from a few seconds to minutes. In September 2011, the Department of Science and Technology proposed to synchronise time nationwide in an effort to discourage tardiness. PAGASA installed a rubidium atomic clock, a GPS receiver, a time interval counter, distribution amplifier and a computer to help calculate the time difference with every satellite within its antenna's field of view.
On 15 May 2013, President Benigno Aquino III signed Republic Act No. 10535, better known as "The Philippine Standard Time (PST) Act" as the latest step of implementing the Juan Time. Since 1 June 2013, all government offices and media networks are required to synchronize their timepieces with PAGASA's rubidium atomic clock. In addition, the first week of January will be regularly observed as the National Time Consciousness Week.