Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

BRT to MDT

-3h

BRT

BRTSOURCE

UTC-03:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

MDT

UTC-06:00☀ DST active

HH09

MM00

09:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

BRT

MDT

12:00 AM

9:00 PM-1

2:00 AM

11:00 PM-1

4:00 AM

1:00 AM

6:00 AM

3:00 AM

8:00 AM

5:00 AM

10:00 AM

7:00 AM

12:00 PM

9:00 AM

2:00 PM

11:00 AM

4:00 PM

1:00 PM

6:00 PM

3:00 PM

8:00 PM

5:00 PM

10:00 PM

7:00 PM

Green rows indicate typical business hours (9 AM - 5 PM)

BRT and MDT on the World Map

The map below highlights the BRT (Brasilia Time) and MDT (Mountain Daylight Time) timezone regions across the globe.

BRT Zone

→

MDT Zone

Explore all world timezones interactively →

BRT – Brasilia Time

UTC-03:00

Brasilia Time (BRT) is the time zone for eastern Brazil, 3 hours behind UTC.

Countries in BRT

Brazil (eastern)

Major Cities in BRT

São PauloRio de JaneiroBrasíliaBelo HorizonteSalvadorFortalezaRecifeCuritiba

Key Facts about BRT

•Brazil abolished daylight saving time in 2019.
•São Paulo is the largest city in the Southern Hemisphere.
•BRT is 2 hours ahead of EST.
•Brazil spans four different time zones.
•The B3 stock exchange in São Paulo operates on BRT.

Daylight Saving:No – UTC-03:00 year-round

Learn more about BRT on Wikipedia

MDT – Mountain Daylight Time

UTC-06:00

Mountain Daylight Time (MDT) is the daylight saving offset in the Mountain Time Zone, 6 hours behind UTC.

Countries in MDT

United States (Mountain)Canada (Alberta)

Major Cities in MDT

DenverCalgaryEdmontonSalt Lake CityBoise

Key Facts about MDT

•MDT shares the same offset as CST (UTC-06:00).
•Arizona does not switch to MDT, remaining on MST.

Daylight Saving:Yes – switches to MST

Learn more about MDT on Wikipedia

Everything You Need to Know About BRT and MDT Time

BRT runs on Brasilia Time (BRT) at UTC-03:00. MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. That puts BRT 3 hours behind MDT — a difference of -3h at the current offsets.

In practice, when it is 9:00 AM in BRT it is 6:00 AM in MDT. Midnight in BRT is 9:00 PM in MDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

BRT to MDT time conversion table

BRT (BRT)	MDT (MDT)	Day
12:00 AM	9:00 PM	previous day
6:00 AM	3:00 AM	same day
7:00 AM	4:00 AM	same day
8:00 AM	5:00 AM	same day
9:00 AM	6:00 AM	same day
12:00 PM	9:00 AM	same day
3:00 PM	12:00 PM	same day
5:00 PM	2:00 PM	same day
6:00 PM	3:00 PM	same day
9:00 PM	6:00 PM	same day

Why people convert BRT to MDT time

Scheduling a call from BRT to MDT: a 10:00 AM start in BRT lands at 7:00 AM in MDT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both BRT and MDT are inside the 9-to-5 working day between 12:00 PM and 5:00 PM BRT time (9:00 AM–2:00 PM MDT). That is roughly 5 hours of usable overlap.
Coordinating a BRT-based team with MDT contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM BRT" is unambiguous; "3 PM" across a -3h gap is not.
Block 12:00 PM–5:00 PM BRT as the recurring meeting window if you work primarily from BRT and need MDT colleagues present.

About BRT (Brasilia Time)

Brasilia Time (BRT) is the standard time in the most populous regions of Brazil, including São Paulo, Rio de Janeiro, and the capital Brasília. Brazil abolished daylight saving time in 2019, so BRT is now observed year-round in these regions. Brazil spans four time zones in total.

About MDT (Mountain Daylight Time)

Mountain Daylight Time (MDT) is observed during summer months in the Mountain Time Zone, except in Arizona which stays on MST year-round. MDT aligns with Central Standard Time (CST) at UTC-06:00.

Best time to call between BRT and MDT

Both BRT and MDT sit inside the 9 AM – 5 PM working day between 12:00 PM–5:00 PM BRT, which is 9:00 AM–2:00 PM MDT. That gives roughly 5 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

BRT and MDT share 5 hours of working-hours overlap (12:00 PM–5:00 PM BRT), so scheduling a live meeting is straightforward.

BRT is 3 hours behind MDT (BRT UTC-03:00 → MDT UTC-06:00). The shared working window is 12:00 PM–5:00 PM BRT. Remember to re-check around daylight-saving transitions.