Highlighted rows fall within 09:00–18:00 in both places: 4 shared working hours.
How many hours is IST behind AEDT?
As abbreviations, AEDT is always 5.5 hours ahead of IST: IST is UTC+5:30 and AEDT is UTC+11. To convert, add 5.5 hours.
When the IST to AEDT time difference changes
For most of the year AEDT is 5.5 hours ahead of IST. From 4 April to 2 October 2027, AEDT is 4.5 hours ahead of IST instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
Dates
AEDT vs IST
Length
4 October 2026 to 31 December 2026
5.5 hours ahead
89 days
1 January 2027 to 3 April 2027
5.5 hours ahead
93 days
4 April 2027 to 2 October 2027
4.5 hours ahead
182 days
3 October 2027 to 31 December 2027
5.5 hours ahead
90 days
When IST and AEDT are both at work
When AEDT is 5.5 hours ahead of IST: 3 shared office hours, 09:00 to 12:00 in IST (14:30 to 17:30 in AEDT).
When AEDT is 4.5 hours ahead of IST: 4 shared office hours, 09:00 to 13:00 in IST (13:30 to 17:30 in AEDT).
Frequently asked questions about IST and AEDT time
How many hours ahead is AEDT of IST?
AEDT (UTC+11) is 5.5 hours ahead of IST (UTC+5:30).
Does the time difference between IST and AEDT change?
Yes. It is usually 5.5 hours ahead, but changes when one side moves its clocks: 4.5 hours ahead from 4 April to 2 October 2027.