Boulder to EDT Time Converter
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Quick answers
Selected conversion
6:00 am06:00 MDT (UTC-6), Oct 12, 2026 = 8:00 am08:00 EDT (UTC-4), Oct 12, 2026
Boulder is 2 hours behind EDT.
How the time difference changes
For most of the year, Boulder is 2 hours behind EDT. From Nov 1, 2026 to Mar 14, 2027, Boulder is 2 hours behind EST. Briefly around clock changes, Boulder is 1 hour behind EST or Boulder is 3 hours behind EDT.
For most of the year, working hours of 9:00 am to 5:00 pm in Boulder correspond to 11:00 am to 7:00 pm in EDT. At other times of the year, working hours of 9:00 am to 5:00 pm in Boulder correspond to 11:00 am to 7:00 pm in EST.For most of the year, working hours of 09:00 to 17:00 in Boulder correspond to 11:00 to 19:00 in EDT. At other times of the year, working hours of 09:00 to 17:00 in Boulder correspond to 11:00 to 19:00 in EST.
Compare Boulder time with EDT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
MDT (Mountain Daylight Time) is 2 hours behind Eastern Daylight Time.
6:00 am06:00 in Boulder, CO, USA is 8:00 am08:00 in EDT
Boulder to EDT call time
Best time for a conference call or a meeting is between 9am-3pm09:00-15:00 in Boulder which corresponds to 11am-5pm11:00-17:00 in EDT
6:00 am06:00 MDT (Mountain Daylight Time) (Boulder, CO, USA). Offset UTC -6:00 hours
8:00 am08:00 Eastern Daylight Time (EDT). Offset UTC -4:00 hours
6:00 am06:00 Boulder, CO, USA / 8:00 am08:00 EDT
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Boulder Time Zone and Facts
Time Zone
MST – Mountain Standard Time, UTC-7 (standard time)
Boulder Facts
Eastern Daylight Time
Offset: EDT is 4 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Bahamas, Canada, Haiti, Turks & Caicos Is, United States
Principal Cities: The largest city in the EDT time zone is New York City in the United States, with about 8.804 million people. Other major cities in this time zone include Toronto, Montréal, Philadelphia, Port-au-Prince.
French: HAE - Heure Avancée de l'Est
Spanish: EDT - Tiempo de verano del Este, ET - Zona Sureste
Today all shaded areas are on EDT.
Daylight Saving: Eastern Daylight Time (EDT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Eastern Standard Time (EST).
Start: Eastern Daylight Time (EDT) started on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.
End: Eastern Daylight Time (EDT) ends on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the first Sunday of November.
EDT representations, usage and related time zones
- -04 - basic short
- -0400 - basic
- -04:00 - extended
- -0400 - sign character (-) followed by a four digit time providing hours (04) and minutes (00) of the offset. Indicates an offset of four hours to the west of the zero meridian.
- Quebec - Military abbreviation for EDT
- Q - short form of 'Quebec'
- America/Detroit
- America/Fort_Wayne
- America/Grand_Turk
- America/Indiana/Indianapolis
- America/Indiana/Marengo
- America/Indiana/Petersburg
- America/Indiana/Vevay
- America/Indiana/Vincennes
- America/Indiana/Winamac
- America/Indianapolis
- America/Iqaluit
- America/Kentucky/Louisville
- America/Kentucky/Monticello
- America/Louisville
- America/Montreal
- America/Nassau
- America/New_York
- America/Nipigon
- America/Pangnirtung
- America/Port-au-Prince
- America/Thunder_Bay
- America/Toronto
- Canada/Eastern
- EST5EDT
- US/East-Indiana
- US/Eastern
- US/Michigan
- AST - Atlantic Standard Time
- EDT - Eastern Daylight Time
- AMT - Amazon Time
- BOT - Bolivia Time
- CDT - Cuba Daylight Time
- CLT - Chile Standard Time
- FKT - Falkland Island Time
- GYT - Guyana Time
- HLV - Hora Legal de Venezuela
- PYT - Paraguay Time
- Q - Quebec Time Zone
- VET - Venezuelan Standard Time