Highlighted rows fall within 09:00–18:00 in both places: 7 shared working hours.
How many hours is IST ahead of GST?
As abbreviations, GST is always 1.5 hours behind of IST: IST is UTC+5:30 and GST is UTC+4. To convert, subtract 1.5 hours.
Does the IST to GST time difference change?
No. Gst is 1.5 hours behind of ist all year, because neither place changes its clocks.
When IST and GST are both at work
When GST is 1.5 hours behind of IST: 6 shared office hours, 11:00 to 17:00 in IST (09:30 to 15:30 in GST).
IST to GST Conversion
India Standard Time (IST) is fixed at UTC+5:30. Gulf Standard Time (GST), used in Dubai and the UAE, is fixed at UTC+4:00. Neither zone observes daylight saving time, so the 1.5-hour difference is constant year-round.
To convert IST to GST: subtract 1 hour and 30 minutes.
For example:
- 09:00 IST → 07:30 GST
- 15:00 IST → 13:30 GST
- 21:00 IST → 19:30 GST
The same 1.5-hour gap applies on every day of the year, no DST adjustments in either zone.
What is 9 AM IST in Dubai?
IST (India)
GST (Dubai/UAE)
00:00 (midnight)
22:30 (previous day)
06:00
04:30
09:00
07:30
12:00 (noon)
10:30
15:00
13:30
18:00
16:30
21:00
19:30
Why UAE-India Coordination Is Simple
The 1.5-hour offset between GST and IST is one of the smallest time differences India has with any major business hub. This makes scheduling calls, flights, and trade between the UAE and India straightforward.
Office hours overlap well: A standard Indian workday (09:30-18:00 IST) corresponds to 08:00-16:30 GST. That covers the full UAE workday.
No DST confusion: Neither country changes clocks. The difference is always 1.5 hours.
Fly time matches: A direct Mumbai, Dubai flight takes about 3 hours. The time difference is half that.
For a full breakdown of the Dubai time zone and its practical quirks, see the IST to Dubai conversion guide. If you need to convert IST to any other time zone, use the IST converter. To understand why India uses a half-hour offset, read what is IST.
Frequently asked questions about IST and GST time
How do I convert 2 PM IST to GST?
Subtract 1.5 hours: 2:00 PM IST = 12:30 PM GST (12:30 in Dubai).
Is the IST to GST difference the same in summer and winter?
Yes. Neither India nor the UAE observes daylight saving time. The difference is 1.5 hours year-round.
What time is it in Dubai when it’s 9 AM in India?
9:00 AM IST = 7:30 AM GST.
Why is Dubai 1.5 hours behind India?
Dubai uses UTC+4 (GST), while India uses UTC+5:30 (IST). The difference comes from the longitudes each zone is based on: India on 82.5°E, Dubai on 60°E.
Do I need to worry about DST when scheduling calls between India and Dubai?
No. Neither region changes clocks. Any meeting time you set works every day of the year.
What’s the best way to remember the conversion?
Think of Dubai time as IST minus 1.5 hours. Or, GST is always 1.5 hours behind IST.
How many hours ahead is GST of IST?
GST (UTC+4) is 1.5 hours behind of IST (UTC+5:30).
Does the time difference between IST and GST change during the year?
No, it stays 1.5 hours behind all year because neither place changes its clocks.