UTC
Universal Time Coordinated
GMT +0
IST
India Standard Time
GMT +5:30
BRT
Brasília time
GMT -3

Time Difference

Universal Time Coordinated is 5 hours and 30 minutes behind India Standard Time and 3 hours ahead of Brasília time
12:30 am00:30 in UTC is 6:00 am06:00 in IST and is 9:30 pm21:30 in BRT

UTC to IST call time
Best time for a conference call or a meeting is between 8am-12:30pm in UTC which corresponds to 1:30pm-6pm in IST
UTC to BRT call time
Best time for a conference call or a meeting is between 11am-6pm in UTC which corresponds to 8am-3pm in BRT

12:30 am00:30 Universal Time Coordinated (UTC). Offset UTC 0:00 hours
6:00 am06:00 India Standard Time (IST). Offset UTC +5:30 hours
9:30 pm21:30 Brasília time (BRT). Offset UTC -3:00 hours

12:30 am00:30 UTC / 6:00 am06:00 IST / 9:30 pm21:30 BRT

UTC IST BRT
12am (midnight) 5:30 am 9pm
1am 6:30 am 10pm
2am 7:30 am 11pm
3am 8:30 am 12am (midnight)
4am 9:30 am 1am
5am 10:30 am 2am
6am 11:30 am 3am
7am 12:30 pm 4am
8am 1:30 pm 5am
9am 2:30 pm 6am
10am 3:30 pm 7am
11am 4:30 pm 8am
12pm (noon) 5:30 pm 9am
1pm 6:30 pm 10am
2pm 7:30 pm 11am
3pm 8:30 pm 12pm (noon)
4pm 9:30 pm 1pm
5pm 10:30 pm 2pm
6pm 11:30 pm 3pm
7pm 12:30 am 4pm
8pm 1:30 am 5pm
9pm 2:30 am 6pm
10pm 3:30 am 7pm
11pm 4:30 am 8pm
0:00 5:30 21:00
1:00 6:30 22:00
2:00 7:30 23:00
3:00 8:30 0:00
4:00 9:30 1:00
5:00 10:30 2:00
6:00 11:30 3:00
7:00 12:30 4:00
8:00 13:30 5:00
9:00 14:30 6:00
10:00 15:30 7:00
11:00 16:30 8:00
12:00 17:30 9:00
13:00 18:30 10:00
14:00 19:30 11:00
15:00 20:30 12:00
16:00 21:30 13:00
17:00 22:30 14:00
18:00 23:30 15:00
19:00 0:30 16:00
20:00 1:30 17:00
21:00 2:30 18:00
22:00 3:30 19:00
23:00 4:30 20:00

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/UCT
  • Etc/UTC
  • Etc/Universal
  • Etc/Zulu
  • UCT
  • UTC
  • Universal
  • Zulu
Time zones with the GMT +0 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

India Standard Time

Offset: IST is 5 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia

Countries: It is used in following countries: India

Principal Cities: The largest city in the IST timezone is Mumbai from India with population about 12.692 million people. Other major cities in the area are Delhi, Bangalore, Kolkata, Chennai

Daylight Saving: India Standard Time (IST) is not adjusted for daylight saving therefore IST remains the same through out the year. This means, unlike some time zones where the clock is set forward by one hour every summer and backward by one hour during winter to adjust for daylight saving, India Standard Time remains the same

IST Time Zone Geo Map
IST timezone map

IST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +0530 - basic
  • +05:30 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0530 - sign character (+) followed by a four digit time providing hours (05) and minutes (30) of the offset. Indicates five hour and thirty minutes time differences to the east of the zero meridian.
IANA/Olson: Reflects IST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Asia/Calcutta
  • Asia/Kolkata
IST Abbreviation: Several time zones share IST abbreviation and it could refer to these time zones
  • India Standard Time - UTC +5:30
  • Irish Standard Time - UTC +1
  • Israel Standard Time - UTC +2
  • Iran Standard Time - UTC +3:30

Brasília time

Offset: BRT is 3 hours behind Greenwich Mean Time (GMT) and is used in South America

BRT Time Zone Geo Map
BRT timezone map

BRT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -03 - basic short
  • -0300 - basic
  • -03:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0300 - sign character (-) followed by a four digit time providing hours (03) and minutes (00) of the offset. Indicates three 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
  • Papa - Military abbreviation for BRT
  • P - short form of 'Papa'
Time zones with the GMT -3 offset:
  • ADT - Atlantic Daylight Time
  • PMT - Pierre & Miquelon Standard Time
  • PMST - Pierre & Miquelon Standard Time
  • WGT - West Greenland Time
  • AMST - Amazon Summer Time
  • ART - Argentina Time
  • BRT - Brasília time
  • CLST - Chile Summer Time
  • FKST - Falkland Islands Summer Time
  • GFT - French Guiana Time
  • P - Papa Time Zone
  • PYST - Paraguay Summer Time
  • SRT - Suriname Time
  • UYT - Uruguay Time