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PDT (Pacific Daylight Time)
GMT -7:00 h
UTC
Universal Time Coordinated
GMT 0:00 h
AEST (Australian Eastern Standard Time)
GMT +10:00 h

Time Difference

PDT (Pacific Daylight Time) is 7 hours behind of Universal Time Coordinated and 17 hours behind of AEST (Australian Eastern Standard Time)
So 3:39 AM03:39 in San Francisco, California, USA is 10:39 AM10:39 in UTC and is 8:39 PM20:39 in Melbourne, Australia

3:39 AM03:39 PDT (Pacific Daylight Time) (San Francisco, California, USA). Offset UTC -7:00 hours
10:39 AM10:39 Universal Time Coordinated (UTC). Offset UTC 0:00 hours
8:39 PM20:39 AEST (Australian Eastern Standard Time) (Melbourne, Australia). Offset UTC +10:00 hours

3:39 AM03:39 San Francisco, California, USA / 10:39 AM10:39 UTC / 8:39 PM20:39 Melbourne, Australia

San Francisco, California, USA UTC Melbourne, Australia
12am (midnight) 7am 5pm
1am 8am 6pm
2am 9am 7pm
3am 10am 8pm
4am 11am 9pm
5am 12pm (noon) 10pm
6am 1pm 11pm
7am 2pm 12am (midnight)
8am 3pm 1am
9am 4pm 2am
10am 5pm 3am
11am 6pm 4am
12pm (noon) 7pm 5am
1pm 8pm 6am
2pm 9pm 7am
3pm 10pm 8am
4pm 11pm 9am
5pm 12am (midnight) 10am
6pm 1am 11am
7pm 2am 12pm (noon)
8pm 3am 1pm
9pm 4am 2pm
10pm 5am 3pm
11pm 6am 4pm
0:00 7:00 17:00
1:00 8:00 18:00
2:00 9:00 19:00
3:00 10:00 20:00
4:00 11:00 21:00
5:00 12:00 22:00
6:00 13:00 23:00
7:00 14:00 0:00
8:00 15:00 1:00
9:00 16:00 2:00
10:00 17:00 3:00
11:00 18:00 4:00
12:00 19:00 5:00
13:00 20:00 6:00
14:00 21:00 7:00
15:00 22:00 8:00
16:00 23:00 9:00
17:00 0:00 10:00
18:00 1:00 11:00
19:00 2:00 12:00
20:00 3:00 13:00
21:00 4:00 14:00
22:00 5:00 15:00
23:00 6:00 16:00

PDT (Pacific Daylight Time)

Offset: PDT is 7 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries: It is used in following countries: Canada, Mexico, United States

Principal Cities: The largest city in the PDT timezone is Los Angeles from USA with population about 3.793 million people. Other major cities in the area are Vancouver, Tijuana, San Diego, San Jose

Daylight Saving: Pacific Daylight Time (PDT) is a daylight saving/summer timezone, however during winter some places switch clocks for one hour back and observe Pacific Standard Time (PST).

Start: Pacific Daylight Time (PDT) starts annually on the same date and time. and clocks were set one hour forward on Sunday, March 10, 2019, at 2:00 (2:00 am) local time.

End: Pacific Daylight Time (PDT) ends annually on the same date and time. and clocks are set one hour back on Sunday, November 3, 2019, at 2:00 (2:00 am) local time.

French: HAP - Heure Avancée du Pacifique

Spanish: PT - Zona Noroeste

San Francisco, California, USA Time Zone Geo Map
San Francisco, California, USA timezone map
San Francisco, California, USA representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -07 - basic short
  • -0700 - basic
  • -07:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0700 - sign character (-) followed by a four digit time providing hours (07) and minutes (00) of the offset. Indicates seven hour and zero minutes time differences to the west of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others
  • Tango - Military abbreviation for PDT
  • T - short form of 'Tango'

IANA/Olson: Reflects PDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Dawson
  • America/Ensenada
  • America/Los_Angeles
  • America/Santa_Isabel
  • America/Tijuana
  • America/Vancouver
  • America/Whitehorse
  • Canada/Pacific
  • Canada/Yukon
  • Mexico/BajaNorte
  • PST8PDT
  • US/Pacific
  • US/Pacific-New

Time zones with the GMT -7:00 h offset:

  • MST - Mountain Standard Time
  • PDT - Pacific Daylight Time
  • T - Tango Time Zone


Universal Time Coordinated

Offset: UTC is 0 hours ahead Greenwich Mean Time (GMT) and is used in Universal

Coordinated Universal Time (UTC) is the world time standard that regulates clocks and time. It is successor to Greenwich Mean Time (GMT). For casual use, UTC is the same as GMT, but is used by the scientific community.
UTC is the time standard commonly used across the world since 1972. It is used in many technical fields, like aviation industry and meteorologists, also used to synchronize time across internet networks.

UTC representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
  • +00 - basic short
  • +0000 - basic
  • +00:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates zero hour and zero minutes time differences of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others
  • Zulu - Military abbreviation for UTC
  • Z - short form of 'Zulu'

IANA/Olson: Reflects UTC time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Etc/UTC
  • Etc/Universal
  • Etc/Zulu
  • UTC
  • Universal
  • Zulu

Time zones with the GMT 0:00 h offset:

  • EGST - Eastern Greenland Summer Time
  • GMT - Greenwich Mean Time
  • WET - Western European Time
  • AZOST - Azores Summer Time
  • UTC - Universal Time Coordinated
  • WT - Western Sahara Standard Time
  • Z - Zulu Time Zone
  • +00 -


AEST (Australian Eastern Standard Time)

Offset: AEST is 10 hours ahead Greenwich Mean Time (GMT) and is used in Australia

Countries: It is used in following countries: Australia

Principal Cities: The largest city in the AEST timezone is Sydney from Australia with population about 4.627 million people. Other major cities in the area are Melbourne, Brisbane, Gold Coast, Canberra

Daylight Saving: This is a standard timezone, however during summer some places switch clocks for one hour forward when daylight saving comes into effect and observe Australian Eastern Daylight Time (AEDT).

Start: AEST starts annually on the same date and time. and clocks were set one hour back on Sunday, April 7, 2019, at 3:00 (3:00 am) local time.

End: AEST ends annually on the same date and time. and clocks are set one hour forward on Sunday, October 6, 2019, at 2:00 (2:00 am) local time.

Melbourne, Australia Time Zone Geo Map
Melbourne, Australia timezone map
Melbourne, Australia representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +10 - basic short
  • +1000 - basic
  • +10:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +1000 - sign character (+) followed by a four digit time providing hours (10) and minutes (00) of the offset. Indicates ten hour and zero minutes time differences to the east of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others
  • Kilo - Military abbreviation for AEST
  • K - short form of 'Kilo'

IANA/Olson: Reflects AEST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Australia/ACT
  • Australia/Brisbane
  • Australia/Canberra
  • Australia/Currie
  • Australia/Hobart
  • Australia/Lindeman
  • Australia/Melbourne
  • Australia/NSW
  • Australia/Queensland
  • Australia/Sydney
  • Australia/Tasmania
  • Australia/Victoria

Time zones with the GMT +10:00 h offset:

  • AEST - Australian Eastern Standard Time
  • CHUT - Chuuk Time
  • ChST - Chamorro Standard Time
  • K - Kilo Time Zone
  • KDT - Korea Daylight Time
  • PGT - Papua New Guinea Time
  • VLAT - Vladivostok Time
  • YAKST - Yakutsk Summer Time
  • YAPT - Yap Time
  • +10 -