What is Time Zone
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. Time zones tend to follow the boundaries of countries and their subdivisions because it is convenient for areas in close commercial or other communication to keep the same time.
Most of the time zones on land are offset from Coordinated Universal Time (UTC) by a whole number of hours (UTC−12 to UTC+14), but a few zones are offset by 30 or 45 minutes (e.g. Newfoundland Standard Time is UTC−03:30, Nepal Standard Time is UTC+05:45, and Indian Standard Time is UTC+05:30).
Some higher latitude and temperate zone countries use daylight saving time for part of the year, typically by adjusting local clock time by an hour. Many land time zones are skewed toward the west of the corresponding nautical time zones. This also creates a permanent daylight saving time effect.
What is UTC
Coordinated Universal Time (abbreviated to UTC) is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at 0° longitude, and is not adjusted for daylight saving time. In some countries where English is spoken, the term Greenwich Mean Time (GMT) is often used as a synonym for UTC.
What is GMT
Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London, reckoned from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon; as a consequence, it cannot be used to specify a precise time unless a context is given.
What is GMT
Timestamp – A sequence of characters or encoded information identifying when a certain event occurred, usually giving a date and a time of day. An example is a postmark on a letter, but these days it is more likely to refer to digital date and time information embedded in computer files or digital pictures.
What is GMT
Civil Time – The statutory time scale designated by civilian authorities to indicate the official local time. This is generally Standard Time in a particular time zone, which is set as a fixed offset from Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT), possibly adjusted by Daylight Saving Time (DST) during part of the year.