JST to IRST Converter
Quick answers
JST is 5 hours and 30 minutes ahead of IRST. JST uses GMT +9, and IRST uses GMT +3:30 for this comparison.
For example, 9:00 pm JST is 3:30 pm IRST. Use the converter above to adjust the date or time and create a shareable meeting link.
Best meeting overlap: 2:30pm-5pm JST, which is 9am-11:30am IRST.
Compare JST time with IRST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Japan Standard Time is 5 hours and 30 minutes ahead of Iran Standard Time
9:00 pm21:00 in JST is 3:30 pm15:30 in IRST
JST to IRST call time
Best time for a conference call or a meeting is between 2:30pm-5pm in JST which corresponds to 9am-11:30am in IRST
9:00 pm21:00 Japan Standard Time (JST). Offset UTC +9:00 hours
3:30 pm15:30 Iran Standard Time (IRST). Offset UTC +3:30 hours
9:00 pm21:00 JST / 3:30 pm15:30 IRST
| JST | IRST |
|---|---|
| 12am (midnight) | 6:30 pm |
| 1am | 7:30 pm |
| 2am | 8:30 pm |
| 3am | 9:30 pm |
| 4am | 10:30 pm |
| 5am | 11:30 pm |
| 6am | 12:30 am |
| 7am | 1:30 am |
| 8am | 2:30 am |
| 9am | 3:30 am |
| 10am | 4:30 am |
| 11am | 5:30 am |
| 12pm (noon) | 6:30 am |
| 1pm | 7:30 am |
| 2pm | 8:30 am |
| 3pm | 9:30 am |
| 4pm | 10:30 am |
| 5pm | 11:30 am |
| 6pm | 12:30 pm |
| 7pm | 1:30 pm |
| 8pm | 2:30 pm |
| 9pm | 3:30 pm |
| 10pm | 4:30 pm |
| 11pm | 5:30 pm |
| 00:00 | 18:30 |
| 01:00 | 19:30 |
| 02:00 | 20:30 |
| 03:00 | 21:30 |
| 04:00 | 22:30 |
| 05:00 | 23:30 |
| 06:00 | 00:30 |
| 07:00 | 01:30 |
| 08:00 | 02:30 |
| 09:00 | 03:30 |
| 10:00 | 04:30 |
| 11:00 | 05:30 |
| 12:00 | 06:30 |
| 13:00 | 07:30 |
| 14:00 | 08:30 |
| 15:00 | 09:30 |
| 16:00 | 10:30 |
| 17:00 | 11:30 |
| 18:00 | 12:30 |
| 19:00 | 13:30 |
| 20:00 | 14:30 |
| 21:00 | 15:30 |
| 22:00 | 16:30 |
| 23:00 | 17:30 |
Japan Standard Time
Offset: JST is 9 hours ahead Greenwich Mean Time (GMT) and is used in Asia
Countries using this time zone: Japan
Principal Cities: The largest city in the JST time zone is Tokyo in Japan, with about 8.337 million people. Other major cities in this time zone include Yokohama, Osaka shi, Nagoya shi, Sapporo.
Daylight Saving: Clocks in Japan Standard Time (JST) do not change for daylight saving time, so JST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter.
JST representations, usage and related time zones
- +09 - basic short
- +0900 - basic
- +09:00 - extended
- +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.
- India - Military abbreviation for JST
- I - short form of 'India'
- Asia/Tokyo
- Japan
- 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
Iran Standard Time
Offset: IRST is 3 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia
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.
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.