Daylight savings time DST is used in the summer months in some regions. DST is 1 hour ahead of standard time. There is no consistency between regions as to when DST takes affect, or reverts back to standard real time. DST was never practical and will eventually be phased out obsolete.
Standard Date Format Virtually the entire world formats time as Hours:Minutes:Seconds hours listed before minutes, minutes listed before seconds. The date format Year-Month-Day has become widely accepted as a standard in many countries. Year The United States and many other countries use the Christian Gregorian calendar to mark years. This calendar has become a standard in such worldwide industries as aviation, and international commerce and trade -- however, other calendars do exist.
PST The Zulu term stems from military usage while Coordinated Universal Time is the civilian term for this hour clock. The origin of these time zones began in the mid 's in England. In the Royal Observatory in Greenwich, England began transmitting time telegraphically and just three years later became the standard time in most of Great Britain.
Also, charts and maps were made with reference to the observatory as the "zero" or prime meridian. Over the next few decades a number of locations around the world had developed their own meridians as reference points. The Greenwich meridian was the most popular of these in part due to the reputation for reliability and correctness of the Greenwich Observatory's publications of navigational data.
In , a conference in Washington, D. This was for both for longitude and timekeeping. However, today the individual zone boundaries are no longer straight, nor are they always continuous, as they have been modified for convenience and to satisfy the desires of sovereign nations.
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