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Bhutan Time (BTT) is the time zone of Bhutan. It is +6:00 hrs ahead of Universal Time Coordinated (UTC+6). Bhutan does not observe any Daylight saving time.
IANA time zone database
The IANA time zone database contains one zone for Bhutan in the file zone.tab, which is named Asia/Thimphu.
References
Bhutan Time Wikipedia(Text) CC BY-SA