MST
Mountain Standard Time
GMT -7
12am
3am
6am
9am
12pm
3pm
6pm
9pm
BRT
Brasília time
GMT -3
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

MST is 4 hours behind BRT. MST uses GMT -7, and BRT uses GMT -3 for this comparison.

For example, 5:00 am MST is 9:00 am BRT. Use the converter above to adjust the date or time and create a shareable meeting link.

Best meeting overlap: 9am-1pm MST, which is 1pm-5pm BRT.

MST is a fixed UTC-7 standard-time offset. For current Mountain Time, compare MDT to BRT.

Compare MST time with BRT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Mountain Standard Time is 4 hours behind Brasília time
5:00 am05:00 in MST is 9:00 am09:00 in BRT

MST to BRT call time
Best time for a conference call or a meeting is between 9am-1pm in MST which corresponds to 1pm-5pm in BRT

5:00 am05:00 Mountain Standard Time (MST). Offset UTC -7:00 hours
9:00 am09:00 Brasília time (BRT). Offset UTC -3:00 hours

5:00 am05:00 MST / 9:00 am09:00 BRT

MSTBRT
12am (midnight)4am
1am5am
2am6am
3am7am
4am8am
5am9am
6am10am
7am11am
8am12pm (noon)
9am1pm
10am2pm
11am3pm
12pm (noon)4pm
1pm5pm
2pm6pm
3pm7pm
4pm8pm
5pm9pm
6pm10pm
7pm11pm
8pm12am (midnight)
9pm1am
10pm2am
11pm3am
00:0004:00
01:0005:00
02:0006:00
03:0007:00
04:0008:00
05:0009:00
06:0010:00
07:0011:00
08:0012:00
09:0013:00
10:0014:00
11:0015:00
12:0016:00
13:0017:00
14:0018:00
15:0019:00
16:0020:00
17:0021:00
18:0022:00
19:0023:00
20:0000:00
21:0001:00
22:0002:00
23:0003:00

Mountain Standard Time

Offset: MST is 7 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries using this time zone: Canada, Mexico, United States

Principal Cities: The largest city in the MST time zone is Phoenix in the United States, with about 1.446 million people. Other major cities in this time zone include Calgary, Edmonton, El Paso, Denver.

French: HNR - Heure Normale des Rocheuses

Spanish: MT - Zona Pacífico

MST Time Zone Geo Map
MST timezone map

Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Mountain Daylight Time (MDT).

Daylight saving time clock moves back for one hour from 2am to 1amStart: Mountain Standard Time (MST) started on Sunday, November 2, 2025 at 2:00 am local time and clocks were set one hour back to Sunday, November 2, 2025, 1:00 am. Standard time starts annually on the first Sunday of November.

Daylight saving time clock moves forward for one hour from 2am to 3amEnd: Mountain Standard Time (MST) ends on Sunday, March 8, 2026 at 2:00 am local time and clocks are set one hour forward to Sunday, March 8, 2026, 3:00 am local daylight time instead. Standard time ends annually on the second Sunday of March.

MST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -07 - basic short
  • -0700 - basic
  • -07:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0700 - sign character (-) followed by a four digit time providing hours (07) and minutes (00) of the offset. Indicates an offset of seven hours to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Tango - Military abbreviation for MST
  • T - short form of 'Tango'
IANA/Olson: Reflects MST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Boise
  • America/Cambridge_Bay
  • America/Ciudad_Juarez
  • America/Creston
  • America/Dawson
  • America/Dawson_Creek
  • America/Denver
  • America/Edmonton
  • America/Fort_Nelson
  • America/Hermosillo
  • America/Inuvik
  • America/Mazatlan
  • America/Phoenix
  • America/Shiprock
  • America/Whitehorse
  • America/Yellowknife
  • Canada/Mountain
  • Canada/Yukon
  • MST
  • MST7MDT
  • Mexico/BajaSur
  • Navajo
  • US/Arizona
  • US/Mountain
Time zones with the GMT -7 offset:
  • MST - Mountain Standard Time
  • PDT - Pacific Daylight Time
  • YST - Yukon Standard Time
  • T - Tango Time Zone

Brasília time

Offset: BRT is 3 hours behind Greenwich Mean Time (GMT) and is used in South America

Countries using this time zone: Brazil

Principal Cities: The largest city in the BRT time zone is Fortaleza in Brazil, with about 2.4 million people. Other major cities in this time zone include Sao Luis, Natal, Teresina, Joao Pessoa.

Daylight Saving: Clocks in Brasília time (BRT) do not change for daylight saving time, so BRT stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter.

BRT Time Zone Geo Map
BRT timezone map

BRT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -03 - basic short
  • -0300 - basic
  • -03:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0300 - sign character (-) followed by a four digit time providing hours (03) and minutes (00) of the offset. Indicates an offset of three hours to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Papa - Military abbreviation for BRT
  • P - short form of 'Papa'
Time zones with the GMT -3 offset:
  • ADT - Atlantic Daylight Time
  • PMT - Pierre & Miquelon Standard Time
  • PMST - Pierre & Miquelon Standard Time
  • AMST - Amazon Summer Time
  • ART - Argentina Time
  • BRT - Brasília time
  • CLST - Chile Summer Time
  • FKST - Falkland Islands Summer Time
  • GFT - French Guiana Time
  • P - Papa Time Zone
  • PYST - Paraguay Summer Time
  • SRT - Suriname Time
  • UYT - Uruguay Time