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Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
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. Eastern Standard Time (EST) is five hours behind Coordinated Universal Time (UTC−05:00).
In communications messages, a date-time group (DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC).
France, including its overseas territories, has the most time zones with 12 (13 including its claim in Antarctica and all other counties). Many countries have daylight saving time, one added hour during the local summer, but this list does not include that information. The UTC offset in the list is not valid in practice during daylight saving time.
In traditional American usage, dates are written in the month–day–year order (e.g. February 23, 2025) with a comma before and after the year if it is not at the end of a sentence [2] and time in 12-hour notation (4:14 am). International date and time formats typically follow the ISO 8601 format (2025-02-23) for all-numeric dates, [3] write ...
Fractional days are often calculated in UTC or TT, although Julian Dates use pre-1925 astronomical date/time (each date began at noon = ".0") and Microsoft Excel uses the local time zone of the computer. Using fractional days reduces the number of units in time calculations from four (days, hours, minutes, seconds) to just one (days).
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The 12-hour notation is widely used in daily life, written communication, and is used in spoken language. The 24-hour notation is typically used in transportation scheduling (Example: Railway timetables and plane departure and landing timing) and also used in Military. HH:MM:SS time format is used.