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BTT
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+05:30
UTC+5:30
30m behind
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+05:30 is not used on this date
This converter keeps +05:30 at UTC+5:30. Kolkata uses IST (UTC+5:30) on this date. Open the IST converter, or choose Mumbai, Delhi, or Bangalore for city-specific time.

Quick answers

Selected conversion

6:00 pm18:00 BTT (UTC+6), Oct 23, 2026 = 5:30 pm17:30 +05:30 (UTC+5:30), Oct 23, 2026

BTT is 30 minutes ahead of +05:30.

BTT and +05:30 examples

These examples always use BTT (UTC+6) and +05:30 (UTC+5:30). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

BTT is 30 minutes ahead of +05:30.

How the time difference changes

BTT is 30 minutes ahead of +05:30 year-round.

Working hours of 9:00 am to 6:00 pm in BTT correspond to 8:30 am to 5:30 pm in +05:30.Working hours of 09:00 to 18:00 in BTT correspond to 08:30 to 17:30 in +05:30.

Compare BTT time with +05:30 time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Bhutan Time is 30 minutes ahead of +05:30 GMT.
6:00 pm18:00 in BTT is 5:30 pm17:30 in +05:30

BTT to +05:30 call time
Best time for a conference call or a meeting is between 9:30am-6pm09:30-18:00 in BTT which corresponds to 9am-5:30pm09:00-17:30 in +05:30

6:00 pm18:00 Bhutan Time (BTT). Offset UTC +6:00 hours
5:30 pm17:30 +05:30 GMT (+05:30). Offset UTC +5:30 hours

6:00 pm18:00 BTT / 5:30 pm17:30 +05:30

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Hourly time comparison
BTT+05:30
11:30pm previous day
12:30am
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10:30pm
23:30 previous day
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Bhutan Time

Offset: BTT is 6 hours ahead of Greenwich Mean Time (GMT).

Countries using this time zone: Bhutan

Principal Cities: The largest city in the BTT time zone is Thimphu in Bhutan, with about 98,676 people. Other major cities in this time zone include Phuntsholing, Tsirang, Punākha, Pemagatshel.

Daylight Saving: Clocks in Bhutan Time (BTT) do not change for daylight saving time, so BTT stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.

BTT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +06 - basic short
  • +0600 - basic
  • +06:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0600 - sign character (+) followed by a four digit time providing hours (06) and minutes (00) of the offset. Indicates an offset of six hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Foxtrot - Military abbreviation for BTT
  • F - short form of 'Foxtrot'
Time zones with the GMT +6 offset:
  • BST - Bangladesh Standard Time
  • BDT - Bangladesh Time
  • BTT - Bhutan Time
  • F - Foxtrot Time Zone
  • IOT - Indian Chagos Time
  • KGT - Kyrgyzstan Time
  • OMST - Omsk Standard Time
  • XJT - Xinjiang Time
  • YEKST - Yekaterinburg Summer Time

+05:30 GMT

Offset: +05:30 is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT).

Countries using this time zone: India, Sri Lanka

Principal Cities: The largest city in the +05:30 time zone is Mumbai in India, with about 12.692 million people. Other major cities in this time zone include Delhi, Bengaluru, Hyderabad, Ahmedabad.

Daylight Saving: Clocks in +05:30 GMT (+05:30) do not change for daylight saving time, so +05:30 stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.

+05:30 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 an offset of five hours and thirty minutes to the east of the zero meridian.