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  2. Greenwich Mean Time - Wikipedia

    en.wikipedia.org/wiki/Greenwich_Mean_Time

    Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, ... 00 is disseminated to the general public in winter and UTC+01:00 in summer ...

  3. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday").

  4. Western European Time - Wikipedia

    en.wikipedia.org/wiki/Western_European_Time

    Western European Time (WET, UTC+00:00) is a time zone covering parts of western Europe and consists of countries using UTC+00:00 (also known as Greenwich Mean Time, abbreviated GMT). [ 1 ] [ 2 ] It is one of the three standard time zones in the European Union along with Central European Time and Eastern European Time .

  5. Time in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_Kingdom

    For 1916, DST extended from 21 May to 1 October, with transitions at 02:00 standard time. On 1 October 1916, Greenwich Mean Time was introduced to Ireland. [5] At the beginning of the 20th century, Sandringham Time was used by the royal household. This practice was abolished by King Edward VIII in an effort to reduce confusions over time.

  6. Time in the Republic of Ireland - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_Republic_of...

    Ireland uses Irish Standard Time (IST, UTC+01:00; Irish: Am Caighdeánach Éireannach) in the summer months and Greenwich Mean Time (UTC+00:00; Irish: Meán-Am Greenwich) in the winter period. [1] Roughly two-thirds of the Republic is located west of the 7.5°W meridian. Thus the local mean time in most of Ireland is closer to UTC-01:00 time ...

  7. 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.

  8. Railway time - Wikipedia

    en.wikipedia.org/wiki/Railway_time

    Clock on The Exchange, Bristol, showing two minute hands, one for London time and one for Bristol time (GMT minus 11 minutes).. Railway time was the standardised time arrangement first applied by the Great Western Railway in England in November 1840, the first recorded occasion when different local mean times were synchronised and a single standard time applied.

  9. Mountain Time Zone - Wikipedia

    en.wikipedia.org/wiki/Mountain_Time_Zone

    The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time (UTC−07:00) is in effect, and by subtracting six hours during daylight saving time (UTC−06:00). The clock time in this zone is based on the mean solar time at the 105th meridian west of the Greenwich ...