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).

MDT to COT

+1h

MDT

MDTSOURCE

UTC-06:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

COT

UTC-05:00

HH01

MM00

13:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

MDT

COT

12:00 AM

1:00 AM

2:00 AM

3:00 AM

4:00 AM

5:00 AM

6:00 AM

7:00 AM

8:00 AM

9:00 AM

10:00 AM

11:00 AM

12:00 PM

1:00 PM

2:00 PM

3:00 PM

4:00 PM

5:00 PM

6:00 PM

7:00 PM

8:00 PM

9:00 PM

10:00 PM

11:00 PM

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

MDT and COT on the World Map

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

MDT Zone

→

COT Zone

Explore all world timezones interactively →

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

COT – Colombia Time

UTC-05:00

Colombia Time (COT) is the standard time for Colombia, 5 hours behind UTC.

Countries in COT

Colombia

Major Cities in COT

BogotáMedellínCaliBarranquillaCartagena

Key Facts about COT

•Colombia does not observe daylight saving time.
•COT is the same offset as EST (UTC-05:00).
•Bogotá sits at 2,640m elevation, making it one of the highest capital cities.

Daylight Saving:No – UTC-05:00 year-round

Learn more about COT on Wikipedia

Comparing Time Zones: MDT and COT

MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. COT runs on Colombia Time (COT) at UTC-05:00. That puts MDT 1 hour ahead of COT — a difference of +1h at the current offsets.

In practice, when it is 9:00 AM in MDT it is 10:00 AM in COT. Midnight in MDT is 1:00 AM in COT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

MDT to COT time conversion table

MDT (MDT)	COT (COT)	Day
12:00 AM	1:00 AM	same day
6:00 AM	7:00 AM	same day
7:00 AM	8:00 AM	same day
8:00 AM	9:00 AM	same day
9:00 AM	10:00 AM	same day
12:00 PM	1:00 PM	same day
3:00 PM	4:00 PM	same day
5:00 PM	6:00 PM	same day
6:00 PM	7:00 PM	same day
9:00 PM	10:00 PM	same day

Why people convert MDT to COT time

Scheduling a call from MDT to COT: a 10:00 AM start in MDT lands at 11:00 AM in COT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both MDT and COT are inside the 9-to-5 working day between 9:00 AM and 4:00 PM MDT time (10:00 AM–5:00 PM COT). That is roughly 7 hours of usable overlap.
Coordinating a MDT-based team with COT 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 MDT" is unambiguous; "3 PM" across a +1h gap is not.
Block 9:00 AM–4:00 PM MDT as the recurring meeting window if you work primarily from MDT and need COT colleagues present.

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.

About COT (Colombia Time)

Colombia Time (COT) is used throughout Colombia. Colombia does not observe daylight saving time. COT shares the same offset as EST (UTC-05:00). Bogotá, the capital, is one of the largest cities in South America.

Best time to call between MDT and COT

Both MDT and COT sit inside the 9 AM – 5 PM working day between 9:00 AM–4:00 PM MDT, which is 10:00 AM–5:00 PM COT. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

MDT and COT share 7 hours of working-hours overlap (9:00 AM–4:00 PM MDT), so scheduling a live meeting is straightforward.

MDT is 1 hour ahead of COT (MDT UTC-06:00 → COT UTC-05:00). The shared working window is 9:00 AM–4:00 PM MDT. Remember to re-check around daylight-saving transitions.