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ACT
ASEAN Common Time
GMT +8
12am
3am
6am
9am
12pm
3pm
6pm
9pm
ULAST
Ulaanbaatar Summer Time
GMT +9
12am
3am
6am
9am
12pm
3pm
6pm
9pm
ULAST is not used on this date
This converter keeps ULAST at GMT +9. Ulaanbaatar uses ULAT (GMT +8) on this date. Open the ULAT converter, or choose Ulaanbaatar, Erdenet, or Darhan for city-specific time.

Quick answers

ACT is 1 hour behind ULAST year-round.

Working hours of 9:00 am to 5:00 pm in ACT correspond to 10:00 am to 6:00 pm in ULAST.

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

Time Difference

ASEAN Common Time is 1 hour behind Ulaanbaatar Summer Time
8:00 pm20:00 in ACT is 9:00 pm21:00 in ULAST

ACT to ULAST call time
Best time for a conference call or a meeting is between 9am-4pm in ACT which corresponds to 10am-5pm in ULAST

8:00 pm20:00 ASEAN Common Time (ACT). Offset UTC +8:00 hours
9:00 pm21:00 Ulaanbaatar Summer Time (ULAST). Offset UTC +9:00 hours

8:00 pm20:00 ACT / 9:00 pm21:00 ULAST

ACTULAST
12am (midnight)1am
1am2am
2am3am
3am4am
4am5am
5am6am
6am7am
7am8am
8am9am
9am10am
10am11am
11am12pm (noon)
12pm (noon)1pm
1pm2pm
2pm3pm
3pm4pm
4pm5pm
5pm6pm
6pm7pm
7pm8pm
8pm9pm
9pm10pm
10pm11pm
11pm12am (midnight)
00:0001:00
01:0002:00
02:0003:00
03:0004:00
04:0005:00
05:0006:00
06:0007:00
07:0008:00
08:0009:00
09:0010:00
10:0011:00
11:0012:00
12:0013:00
13:0014:00
14:0015:00
15:0016:00
16:0017:00
17:0018:00
18:0019:00
19:0020:00
20:0021:00
21:0022:00
22:0023:00
23:0000:00

ASEAN Common Time

Offset: ACT is 8 hours ahead Greenwich Mean Time (GMT) and is used in Asia

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

ACT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +08 - basic short
  • +0800 - basic
  • +08:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0800 - sign character (+) followed by a four digit time providing hours (08) and minutes (00) of the offset. Indicates an offset of eight hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Hotel - Military abbreviation for ACT
  • H - short form of 'Hotel'
Time zones with the GMT +8 offset:
  • ACT - ASEAN Common Time
  • AWST - Australian Western Standard Time
  • BNT - Brunei Darussalam Time
  • CAST - Casey Time
  • CHOT - Choibalsan Time
  • CST - China Standard Time
  • H - Hotel Time Zone
  • HKT - Hong Kong Time
  • HOVST - Hovd Summer Time
  • IRKT - Irkutsk Time
  • KRAST - Krasnoyarsk Summer Time
  • MYT - Malaysia Time
  • PHT - Philippine Time
  • SGT - Singapore Time
  • ULAT - Ulaanbaatar Time
  • WITA - Central Indonesian Time

Ulaanbaatar Summer Time

Offset: ULAST is 9 hours ahead Greenwich Mean Time (GMT) and is used in Asia

ULAST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +09 - basic short
  • +0900 - basic
  • +09:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0900 - sign character (+) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates an offset of nine hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • India - Military abbreviation for ULAST
  • I - short form of 'India'
Time zones with the GMT +9 offset:
  • AWDT - Australian Western Daylight Time
  • CHOST - Choibalsan Summer Time
  • I - India Time Zone
  • IRKST - Irkutsk Summer Time
  • JST - Japan Standard Time
  • KST - Korea Standard Time
  • PWT - Palau Time
  • TLT - East Timor Time
  • ULAST - Ulaanbaatar Summer Time
  • WIT - Eastern Indonesian Time
  • YAKT - Yakutsk Time