Time zones. World Time Zone Map

The use of local time for time-stamping records is not recommended for time zones that implement daylight saving time because once a year there is a one-hour period when local times are ambiguous This also occurs for short flights from an earlier to a later time zone, for instance from Minsk to Warsaw, though in those cases you will generally arrive less than an hour before you started
Modern DST was first proposed in 1907 and was in widespread use in 1916 as a measure aimed at In Microsoft Outlook, time stamps are therefore stored and communicated without DST offsets

USA time zones map with cities and current local time 12 hour format

Just click on any state above and see the current time and date.

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US Time Zone Map — Time in United States
Some of these locations also use DST , further increasing the difference to local solar time
List of countries grouped by UTC offset
Europe Standard Time UTC+01:00 WET 280 New Caledonia Central Pacific Standard Time SBT 290 New Zealand New Zealand Standard Time UTC+12:00 NZST 060 Newfoundland and Labrador Newfoundland and Labrador Standard Time UTC-03:30 NST 033 Nicaragua Central America Standard Time UTC-06:00 CST 113 Niger W
List of U.S. states and territories by time zone
Four standard time zones for the continental United States were introduced at noon on November 18, 1883, in , when the telegraph lines transmitted time signals to all major cities
Most tropical countries see absolutely no need for DST, keeping standard time year round For example 'Eastern Standard Time' represents both EST UTC-05:00 and EDT UTC-04:00 The MDT will use these values in a scripted install, e
Hence, an appointment in London at noon in the summer will be represented as 12:00 UTC+00:00 even though the event will actually take place at 13:00 UTC Generalized time zones are often called by their generic name, without making a difference between standard time and Daylight Saving Time

Time Zone

A common practice for is to use the Earth-based time of the launch site or mission control, synchronizing the sleeping cycles of the crew and controllers.

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US Time Zones Map
They observe the Indian Standard Time IST which has an offset of thirty minutes from Coordinated Universal Time
The World Clock — Worldwide
Time in the United States - Time Zones Map and Clock of current local time in major cities in the US
World Time Zone and current time around the World and standard world time zones map of the world
Train drivers must recalculate their own clocks in order to know departure time