|Light Blue||Western European Time / Greenwich Mean Time (UTC)|
|Blue||Western European Time / Greenwich Mean Time (UTC)|
|Western European Summer Time / British Summer Time / Irish Standard Time (UTC+1)|
|Red||Central European Time (UTC+1)|
|Central European Summer Time (UTC+2)|
|Yellow||Eastern European Time / Kaliningrad Time (UTC+2)|
|Ochre||Eastern European Time (UTC+2)|
|Eastern European Summer Time (UTC+3)|
|Green||Moscow Time / Turkey Time (UTC+3)|
|Turquoise||Armenia Time / Azerbaijan Time / Georgia Time / Samara Time (UTC+4)|
▉▉▉ Dark colours: Summer time observed
In Bulgaria, the standard time is Eastern European Time (EET; UTC+02:00). Daylight saving time, which moves one hour ahead to UTC+03:00 is observed from the last Sunday in March to the last Sunday in October, inline with most EU member states.
Bulgaria first observed daylight saying time between 1943 and 1944, and regularly since 1979.
IANA time zone database
- Time in Bulgaria. TimeAndDate.com. Retrieved 5 May 2021.
- Bulgaria at The World Factbook. Central Intelligence Agency (CIA). Retrieved 5 May 2021.
- Bulgaria Turns Clocks to Daylight Saving Time March 28. Sofia News Agency – Novinite.com. Retrieved 5 July 2021.
- Clock Changes in Sofia, Bulgaria. TimeAndDate.com. Retrieved 5 May 2021.
- Time in Bulgaria. Lonely Planet. Retrieved 5 May 2021.
- Europe (2020 edition) at the tz database. Internet Assigned Numbers Authority (IANA). Retrieved 20 May 2021.
- Current time in Bulgaria at Time.is