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  2. Philippine Standard Time - Wikipedia

    en.wikipedia.org/wiki/Philippine_Standard_Time

    Philippine Standard Time: April 12, 1954 – June 30, 1954 GMT+09:00: Philippine Daylight Saving Time: July 1, 1954 – March 21, 1978 GMT/UTC+08:00 [note 3] Philippine Standard Time: March 22, 1978 – September 20, 1978 UTC+09:00: Philippine Daylight Saving Time: September 21, 1978 – May 20, 1990 UTC+08:00: Philippine Standard Time

  3. List of tz database time zones - Wikipedia

    en.wikipedia.org/wiki/List_of_tz_database_time_zones

    Further reading. List of tz database time zones. The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [ 1 ] This is a list of time zones from release 2024a of the tz database. [ 2 ]

  4. List of conversion factors - Wikipedia

    en.wikipedia.org/wiki/List_of_conversion_factors

    The general relationship between absorbed dose and equivalent dose can be represented as. H = Q ⋅ D. where H is the equivalent dose, D is the absorbed dose, and Q is a dimensionless quality factor. Thus, for any quantity of D measured in Gy, the numerical value for H measured in Sv may be different.

  5. Eastern Time Zone - Wikipedia

    en.wikipedia.org/wiki/Eastern_Time_Zone

    The Eastern Time Zone ( ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico . Places that use: Eastern Standard Time ( EST ), when observing standard time (autumn/winter), are five hours behind Coordinated Universal Time ( UTC−05:00 ...

  6. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.

  7. List of time zone abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_time_zone...

    East Africa Time: UTC+03: ECT: Eastern Caribbean Time (does not recognise DST) UTC−04: ECT: Ecuador Time: UTC−05: EDT: Eastern Daylight Time (North America) UTC−04: EEST: Eastern European Summer Time: UTC+03: EET: Eastern European Time: UTC+02: EGST: Eastern Greenland Summer Time: UTC±00: EGT: Eastern Greenland Time: UTC−01: EST ...

  8. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property ...

  9. History of the Philippines (1565–1898) - Wikipedia

    en.wikipedia.org/wiki/History_of_the_Philippines...

    The history of the Philippines from 1565 to 1898 is known as the Spanish colonial period, during which the Philippine Islands were ruled as the Captaincy General of the Philippines within the Spanish East Indies, initially under the Viceroyalty of New Spain, based in Mexico City, until the independence of the Mexican Empire from Spain in 1821.