IRST to UTC Converter
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Quick answers
Selected conversion
3:30 pm15:30 IRST (UTC+3:30), Oct 12, 2026 = 12:00 pm12:00 UTC (UTC+0), Oct 12, 2026
IRST is 3 hours and 30 minutes ahead of UTC.
IRST and UTC examples
These examples always use IRST (UTC+3:30) and UTC (UTC+0). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
IRST is 3 hours and 30 minutes ahead of UTC.
How the time difference changes
IRST is 3 hours and 30 minutes ahead of UTC year-round.
Working hours of 9:00 am to 5:00 pm in IRST correspond to 5:30 am to 1:30 pm in UTC.Working hours of 09:00 to 17:00 in IRST correspond to 05:30 to 13:30 in UTC.
Compare IRST time with UTC time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Iran Standard Time is 3 hours and 30 minutes ahead of Coordinated Universal Time.
3:30 pm15:30 in IRST is 12:00 pm12:00 in UTC
IRST to UTC call time
Best time for a conference call or a meeting is between 12:30pm-5pm12:30-17:00 in IRST which corresponds to 9am-1:30pm09:00-13:30 in UTC
3:30 pm15:30 Iran Standard Time (IRST). Offset UTC +3:30 hours
12:00 pm12:00 Coordinated Universal Time (UTC). Offset UTC 0:00 hours
3:30 pm15:30 IRST / 12:00 pm12:00 UTC
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| IRST | UTC |
|---|---|
| 8:30pm previous day | |
| 9:30pm previous day | |
| 10:30pm previous day | |
| 11:30pm previous day | |
| 12:30am | |
| 1:30am | |
| 2:30am | |
| 3:30am | |
| 4:30am | |
| 5:30am | |
| 6:30am | |
| 7:30am | |
| 8:30am | |
| 9:30am | |
| 10:30am | |
| 11:30am | |
| 12:30pm | |
| 1:30pm | |
| 2:30pm | |
| 3:30pm | |
| 4:30pm | |
| 5:30pm | |
| 6:30pm | |
| 7:30pm | |
| 20:30 previous day | |
| 21:30 previous day | |
| 22:30 previous day | |
| 23:30 previous day | |
| 00:30 | |
| 01:30 | |
| 02:30 | |
| 03:30 | |
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| 05:30 | |
| 06:30 | |
| 07:30 | |
| 08:30 | |
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| 13:30 | |
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| 15:30 | |
| 16:30 | |
| 17:30 | |
| 18:30 | |
| 19:30 |
Iran Standard Time
Offset: IRST is 3 hours and 30 minutes ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Iran
Principal Cities: The largest city in the IRST time zone is Tehran in Iran, with about 7.153 million people. Other major cities in this time zone include Mashhad, Isfahan, Karaj, Tabriz.
Daylight Saving: Clocks in Iran Standard Time (IRST) do not change for daylight saving time, so IRST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
IRST representations, usage and related time zones
- +0330 - basic
- +03:30 - extended
- +0330 - sign character (+) followed by a four digit time providing hours (03) and minutes (30) of the offset. Indicates an offset of three hours and thirty minutes to the east of the zero meridian.
Coordinated Universal Time
Offset: UTC is the same as Greenwich Mean Time (GMT).
Coordinated Universal Time (UTC) is the world time standard that regulates clocks and time. It is the successor to Greenwich Mean Time (GMT). For casual use, UTC is the same as GMT, but UTC is the standard the scientific community uses.
UTC has been the time standard commonly used across the world since 1972. It is used in many technical fields, such as aviation and meteorology, and to synchronize time across internet networks.
Today some of the lighter areas are on UTC+1 (British Summer Time, Irish Standard Time, WEST).
UTC representations, usage and related time zones
- Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
- +00 - basic short
- +0000 - basic
- +00:00 - extended
- +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
- Zulu - Military abbreviation for UTC
- Z - short form of 'Zulu'
- Etc/UCT
- Etc/UTC
- Etc/Universal
- Etc/Zulu
- UCT
- UTC
- Universal
- Zulu
- EGST - Eastern Greenland Summer Time
- GMT - Greenwich Mean Time
- WET - Western European Time
- AZOST - Azores Summer Time
- UTC - Coordinated Universal Time
- WT - Western Sahara Standard Time
- Z - Zulu Time Zone