IST to I Converter
Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
5:30 pm17:30 IST (UTC+5:30), Oct 19, 2026 = 9:00 pm21:00 I (UTC+9), Oct 19, 2026
IST is 3 hours and 30 minutes behind I.
IST and I examples
These examples always use IST (UTC+5:30) and I (UTC+9). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
IST is 3 hours and 30 minutes behind I.
How the time difference changes
IST is 3 hours and 30 minutes behind I year-round.
Working hours of 9:00 am to 6:00 pm in IST correspond to 12:30 pm to 9:30 pm in I.Working hours of 09:00 to 18:00 in IST correspond to 12:30 to 21:30 in I.
Compare IST time with I time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
India Standard Time is 3 hours and 30 minutes behind India Time Zone.
5:30 pm17:30 in IST is 9:00 pm21:00 in I
IST to I call time
Best time for a conference call or a meeting is between 9am-2:30pm09:00-14:30 in IST which corresponds to 12:30pm-6pm12:30-18:00 in I
5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
9:00 pm21:00 India Time Zone (I). Offset UTC +9:00 hours
5:30 pm17:30 IST / 9:00 pm21:00 I
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.
| IST | I |
|---|---|
| 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 | |
| 8:30pm | |
| 9:30pm | |
| 10:30pm | |
| 11:30pm | |
| 12:30am next day | |
| 1:30am next day | |
| 2:30am next day | |
| 03:30 | |
| 04:30 | |
| 05:30 | |
| 06:30 | |
| 07:30 | |
| 08:30 | |
| 09:30 | |
| 10:30 | |
| 11:30 | |
| 12:30 | |
| 13:30 | |
| 14:30 | |
| 15:30 | |
| 16:30 | |
| 17:30 | |
| 18:30 | |
| 19:30 | |
| 20:30 | |
| 21:30 | |
| 22:30 | |
| 23:30 | |
| 00:30 next day | |
| 01:30 next day | |
| 02:30 next day |
India Standard Time
Offset: IST is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT).
Countries using this time zone: India
Principal Cities: The largest city in the IST time zone is Mumbai in India, with about 12.692 million people. Other major cities in this time zone include Delhi, Bengaluru, Hyderabad, Ahmedabad.
Daylight Saving: Clocks in India Standard Time (IST) do not change for daylight saving time, so IST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
Current time in India: India time now
IST representations, usage and related time zones
- +0530 - basic
- +05:30 - extended
- +0530 - sign character (+) followed by a four digit time providing hours (05) and minutes (30) of the offset. Indicates an offset of five hours and thirty minutes to the east of the zero meridian.
- Asia/Calcutta
- Asia/Kolkata
- India Standard Time - UTC +5:30
- Irish Standard Time - UTC +1
- Israel Standard Time - UTC +2
India Time Zone
Offset: I is 9 hours ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Indonesia, Japan, North Korea, Palau, Russia, South Korea, Timor-Leste
Principal Cities: The largest city in the I time zone is Seoul in South Korea, with about 10.349 million people. Other major cities in this time zone include Tokyo, Yokohama, Busan, Pyongyang.
Daylight Saving: Clocks in India Time Zone (I) do not change for daylight saving time, so I stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
I 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 I
- I - short form of 'India'
- 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