Time Zone Conversions

See the US Naval Observatory's World Time Zones for a complete reference.

They also have a Universal Time Master Clock.

For some places that I'm likely to be:

Difference from Universal Time (UTC)

(also referred to as Greenwich Mean Time (GMT) or Zulu Time)

Time Zone	Standard Offset	Mar-Nov	Nov-Mar
US Eastern Standard/Daylight Time	-5 hours	-4 hours	-5 hours
US Central Standard/Daylight Time	-6 hours	-5 hours	-6 hours
US Mountain Standard/Daylight Time	-7 hours	-6 hours	-7 hours
US Pacific Standard/Daylight Time	-8 hours	-7 hours	-8 hours
Arizona (always MST)	-7 hours	-7 hours	-7 hours
Hawaiian Standard Time	-10 hours	-10 hours	-10 hours
Australian Eastern Standard/Savings Time	+10 hours	+10 hours	+11 hours
New Zealand	+12 hours	+12 hours	+13 hours
United Kingdom	0 hours	+1 hour	0 hours
Continental Europe	+1 hour	+2 hours	+1 hours

Example: Times in the Pacific during Summer and Winter

Location	June	December
Hawaii	noon Tuesday	noon Tuesday
San Francisco	3 pm Tuesday	2 pm Tuesday
Sydney	8 am Wednesday	9 am Wednesday
Auckland	10 am Wednesday	11 am Wednesday

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Last modified 14 March, 2024. © Gregory C. Sloan.