The time zone clocks show Standard Time. Add one hour for Daylight Savings Time (DST).
This does not apply to the Local Time and UTC displays, as they remain correct as shown.
The time accuracy of the World Clock is a function of the user's computer system clock, since it is mathematically derived from that source.
All time zone clocks are shown in Standard Time. However, during the months of March/April thru September/October, countries in the northern hemisphere are in the summer season and may be observing Daylight Savings Time (DST) or "Summer Time".
If so, add one hour to the Standard Time shown (this does not apply to the "Local Time" and "UTC" displays). During these months, countries in the southern hemisphere are in the winter season and are using the Standard Time.
During the months of September/October thru March/April, countries in the northern hemisphere are in the winter season and are using Standard Time. During these months, those in the southern hemisphere are in summer and may be observing DST or "Summer Time".
If so, add one hour to the Standard Time shown (this does not apply to the "Local Time" display). There are many countries that do not observe DST, and those that do, may not change over to DST at the same dates.
Coordinated Universal Time (UTC), is considered as the universal time zone located at the zero meridian and is used as a worldwide reference for time correlation. The time changes one hour for each change of 15 degrees in longitude.
In the 24 hour system, 2400 hours and 0000 hours have the same meaning; however, 2400 is usually used with the date of the ending day and 0000 with the new day's date. UTC does not observe or make provisions for DST.
World locations of the same longitude have close to the same local time.
There are approximately 24 standard time zones around the globe which are an integer offset of hours to UTC time. However, there are some countries which do not use the standard time zones and may be a non-integer offset of hours to UTC time.
Major Time Zone Abbreviations
UTC - Coordinated Universal Time
GMT - Greenwich Mean Time
Z - Zero Meridan Time (Zulu Time, same as UTC and GMT): Zulu is often a phonetic for the letter Z in communications and military applications.
U.S.A. and Canada
AST - Atlantic Standard Time, UTC-4 hours
ADT - Atlantic Daylight Time, UTC-3 hours
EST - Eastern Standard Time, UTC-5 hours
EDT - Eastern Daylight Savings Time, UTC-4 hours
ET - Eastern Time, EST or EDT
CST - Central Standard Time, UTC-6 hours
CDT - Central Daylight Savings Time, UTC-5 hours
CT - Central Time, CST or CDT
MST - Mountain Standard Time, UTC-7 hours
MDT - Mountain Daylight Savings Time, UTC-6 hours
MT - Mountain Time, MST or MDT
PST - Pacific Standard Time, UTC-8 hours
PDT - Pacific Daylight Savings Time, UTC-7 hours
PT - Pacific Time, PST or PDT
HST - Hawaiian Standard Time, UTC-10 hours
AKST - Alaska Standard Time, UTC-9 hours
AKDT - Alaska Standard Daylight Savings Time, UTC-8 hours
GMT - Greenwich Mean Time, UTC
BST - British Summer Time, UTC+1 hour
IST - Irish Summer Time, UTC+1 hour
WET - Western Europe Time, UTC
WEST - Western Europe Summer Time, UTC+1 hour
CET - Central Europe Time, UTC+1 hour
CEST - Central Europe Summer Time, UTC+2 hours
EET - Eastern Europe Time, UTC+2 hours
EEST - Eastern Europe Summer Time, UTC+3 hours
MSK - Moscow Time, UTC+3 hours
MSD - Moscow Summer Time, UTC+4 hours
WST - Western Standard Time, UTC+8 hours
CST - Central Standard Time, UTC+9.5 hours
EST - Eastern Standard/Summer Time, UTC+10 hours/UTC+11 hours
Official U. S. Time - Nat'l Institute of Standards and Technology (NIST)
World Clock - Time and Date
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