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Colorado, USAMDT
UTC−6
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6am
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CEST
12am
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6am
9am
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9pm

Quick answers

Selected conversion

6:00 am06:00 MDT (UTC-6), Oct 12, 2026 = 2:00 pm14:00 CEST (UTC+2), Oct 12, 2026

Boulder is 8 hours behind CEST.

How the time difference changes

For most of the year, Boulder is 8 hours behind CEST. From Oct 25 to Nov 1, 2026, and from Mar 14 to Mar 28, 2027, Boulder is 7 hours behind CET. From Nov 1, 2026 to Mar 14, 2027, Boulder is 8 hours behind CET.

For most of the year, working hours of 9:00 am to 5:00 pm in Boulder correspond to 5:00 pm to 1:00 am (next day) in CEST. At other times of the year, working hours of 9:00 am to 5:00 pm in Boulder correspond to 5:00 pm to 1:00 am (next day) in CET or working hours of 9:00 am to 5:00 pm in Boulder correspond to 4:00 pm to 12:00 am (next day) in CET.For most of the year, working hours of 09:00 to 17:00 in Boulder correspond to 17:00 to 01:00 (next day) in CEST. At other times of the year, working hours of 09:00 to 17:00 in Boulder correspond to 17:00 to 01:00 (next day) in CET or working hours of 09:00 to 17:00 in Boulder correspond to 16:00 to 00:00 (next day) in CET.

Compare Boulder time with CEST 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 8 hours behind Central European Summer Time.
6:00 am06:00 in Boulder, CO, USA is 2:00 pm14:00 in CEST

Boulder to CEST call time
Best time for a conference call or a meeting is between 8:30am-9:30am08:30-09:30 in Boulder which corresponds to 4:30pm-5:30pm16:30-17:30 in CEST. Their 9am–5pm09:00–17:00 working hours do not overlap; this is a suggested compromise.

6:00 am06:00 MDT (Mountain Daylight Time) (Boulder, CO, USA). Offset UTC -6:00 hours
2:00 pm14:00 Central European Summer Time (CEST). Offset UTC +2:00 hours

6:00 am06:00 Boulder, CO, USA / 2:00 pm14:00 CEST

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Hourly time comparison
Boulder, CO, USACEST
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Boulder Time Zone and Facts

Time Zone

Abbreviation / Offset
MDT – Mountain Daylight Time, UTC-6 (now, daylight saving time)
MST – Mountain Standard Time, UTC-7 (standard time)
Daylight Saving Time Ends
123456789101112Sunday, November 1, 2026 at 2:00 amSunday, November 1, 2026 at 02:00: clocks go back 1 hour to 1:00 am01:00 (MST). DST ends on the 1st Sunday of November each year. Also called Fall Back or Winter Time.
Daylight Saving Time Starts
123456789101112Sunday, March 14, 2027 at 2:00 amSunday, March 14, 2027 at 02:00: clocks go forward 1 hour to 3:00 am03:00 (MDT). DST starts on the 2nd Sunday of March each year. Also called Spring Forward or Summer Time.

Boulder Facts

Country
USA
State
Colorado
Alternative Names
Bolder, Boulder, Bouldur, WBU, ba'uldara, bo de, boldara, bolde xr, boldeo, boruda, bwldr, bwldr klradw, Болдер, Боулдер, Боулдър, בולדר, بولدر, بولدر، کلرادو, بولڈر، کولوراڈو, बाउल्डर, बोल्डर, โบลเดอร์, ボルダー, 波德, 볼더
Population
106,803
Currency
Dollar (USD)
Geographic Coordinates
40° 00' N Latitude / 105° 16' W Longitude
International Dialing Code
+1

Central European Summer Time

Offset: CEST is 2 hours ahead of Greenwich Mean Time (GMT).

Countries using this time zone: Andorra, Albania, Austria, Bosnia & Herzegovina, Belgium, Switzerland, Czech Republic, Germany, Denmark, Spain, France, Gibraltar, Croatia, Hungary, Italy, Liechtenstein, Luxembourg, Monaco, Montenegro, North Macedonia, Malta, Netherlands, Norway, Poland, Serbia, Sweden, Slovenia, Svalbard & Jan Mayen, Slovakia, San Marino, Vatican City

Principal Cities: The largest city in the CEST time zone is Berlin in Germany, with about 3.426 million people. Other major cities in this time zone include Madrid, Rome, Paris, Hamburg.

German: MESZ - Mitteleuropäische Sommerzeit

Map of the areas on Central European Summer Time (CEST)
CEST part of the year

Today all shaded areas are on CEST.

Daylight Saving: Central European Summer Time (CEST) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Central European Time (CET).

123456789101112Start: Central European Summer Time (CEST) started on Sunday, March 29, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 29, 2026, 3:00 am03:00. Daylight saving starts annually on the last Sunday of March.

123456789101112End: Central European Summer Time (CEST) ends on Sunday, October 25, 2026 at 3:00 am03:00 local time and clocks are set one hour back to Sunday, October 25, 2026, 2:00 am02:00 local standard time instead. Daylight saving ends annually on the last Sunday of October.

See upcoming clock changes worldwide.

CEST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +02 - basic short
  • +0200 - basic
  • +02:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0200 - sign character (+) followed by a four digit time providing hours (02) and minutes (00) of the offset. Indicates an offset of two hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Bravo - Military abbreviation for CEST
  • B - short form of 'Bravo'
IANA/Olson: Reflects CEST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Africa/Ceuta
  • Arctic/Longyearbyen
  • Atlantic/Jan_Mayen
  • CET
  • Europe/Amsterdam
  • Europe/Andorra
  • Europe/Belgrade
  • Europe/Berlin
  • Europe/Bratislava
  • Europe/Brussels
  • Europe/Budapest
  • Europe/Busingen
  • Europe/Copenhagen
  • Europe/Gibraltar
  • Europe/Ljubljana
  • Europe/Luxembourg
  • Europe/Madrid
  • Europe/Malta
  • Europe/Monaco
  • Europe/Oslo
  • Europe/Paris
  • Europe/Podgorica
  • Europe/Prague
  • Europe/Rome
  • Europe/San_Marino
  • Europe/Sarajevo
  • Europe/Skopje
  • Europe/Stockholm
  • Europe/Tirane
  • Europe/Vaduz
  • Europe/Vatican
  • Europe/Vienna
  • Europe/Warsaw
  • Europe/Zagreb
  • Europe/Zurich
  • MET
  • Poland
Time zones with the GMT +2 offset:
  • CEST - Central European Summer Time
  • EET - Eastern European Time
  • MESZ - Mitteleuropäische Sommerzeit
  • B - Bravo Time Zone
  • CAT - Central Africa Time
  • IST - Israel Standard Time
  • SAST - South Africa Standard Time
  • WAST - West Africa Summer Time