IRDT to UST Ust
IRDT
Iran Daylight Time
GMT +4:30
UST
Ulaanbaatar Standard Time
GMT +8
Time Difference
Iran Daylight Time is 3 hours and 30 minutes behind Ulaanbaatar Standard Time
2:00 am02:00 in IRDT is 5:30 am05:30 in UST
IRDT to UST call time
Best time for a conference call or a meeting is between 8am-2:30pm in IRDT which corresponds to 11:30am-6pm in UST
2:00 am02:00 Iran Daylight Time (IRDT). Offset UTC +4:30 hours
5:30 am05:30 Ulaanbaatar Standard Time (UST). Offset UTC +8:00 hours
2:00 am02:00 IRDT / 5:30 am05:30 UST
IRDT | UST |
---|---|
12am (midnight) | 3:30 am |
1am | 4:30 am |
2am | 5:30 am |
3am | 6:30 am |
4am | 7:30 am |
5am | 8:30 am |
6am | 9:30 am |
7am | 10:30 am |
8am | 11:30 am |
9am | 12:30 pm |
10am | 1:30 pm |
11am | 2:30 pm |
12pm (noon) | 3:30 pm |
1pm | 4:30 pm |
2pm | 5:30 pm |
3pm | 6:30 pm |
4pm | 7:30 pm |
5pm | 8:30 pm |
6pm | 9:30 pm |
7pm | 10:30 pm |
8pm | 11:30 pm |
9pm | 12:30 am |
10pm | 1:30 am |
11pm | 2:30 am |
0:00 | 3:30 |
1:00 | 4:30 |
2:00 | 5:30 |
3:00 | 6:30 |
4:00 | 7:30 |
5:00 | 8:30 |
6:00 | 9:30 |
7:00 | 10:30 |
8:00 | 11:30 |
9:00 | 12:30 |
10:00 | 13:30 |
11:00 | 14:30 |
12:00 | 15:30 |
13:00 | 16:30 |
14:00 | 17:30 |
15:00 | 18:30 |
16:00 | 19:30 |
17:00 | 20:30 |
18:00 | 21:30 |
19:00 | 22:30 |
20:00 | 23:30 |
21:00 | 0:30 |
22:00 | 1:30 |
23:00 | 2:30 |
Iran Daylight Time
Offset: IRDT is 4 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia

IRDT representations, usage and related time zones
W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
- +0430 - basic
- +04:30 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
- +0430 - sign character (+) followed by a four digit time providing hours (04) and minutes (30) of the offset. Indicates four hour and thirty minutes time differences to the east of the zero meridian.
Time zones with the GMT +4:30 offset:
- AFT - Afghanistan Time
- IRDT - Iran Daylight Time
Ulaanbaatar Standard Time
Offset: UST is 8 hours ahead Greenwich Mean Time (GMT) and is used in Asia
UST 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 eight hour and zero minutes time differences to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
- Hotel - Military abbreviation for UST
- 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