ISTtoGSTIndia Standard Time to Gulf Standard Time
IST
India Standard Time (GMT+5:30)GST
Gulf Standard Time (GMT+4)Mutual Working Window: 6 Overlapping Hours
Recommended calling window between IST and GST
Both locations share 6 overlapping standard business hours (9:00 AM – 5:00 PM). This is the premier window for real-time video conferences, corporate calls, and instant collaboration without outside-hours disruption.
24-Hour Schedule Conversion Matrix
Compare every hour of the day between IST and GST.
| IST Time (India Standard Time) | GST Time (Gulf Standard Time) | Status & Recommendation |
|---|---|---|
| 00:00AM | 22:00PM-1 day | ⚪ Outside Work Hours |
| 01:00AM | 23:00PM-1 day | ⚪ Outside Work Hours |
| 02:00AM | 00:00AM | ⚪ Outside Work Hours |
| 03:00AM | 01:00AM | ⚪ Outside Work Hours |
| 04:00AM | 02:00AM | ⚪ Outside Work Hours |
| 05:00AM | 03:00AM | ⚪ Outside Work Hours |
| 06:00AM | 04:00AM | ⚪ Outside Work Hours |
| 07:00AM | 05:00AM | ⚪ Outside Work Hours |
| 08:00AM | 06:00AM | ⚪ Outside Work Hours |
| 09:00AM | 07:00AM | 🟡 Feasible (Shoulder Hour) |
| 10:00AM | 08:00AM | 🟡 Feasible (Shoulder Hour) |
| 11:00AM | 09:00AM | 🟢 Ideal Meeting Window |
| 12:00PM | 10:00AM | 🟢 Ideal Meeting Window |
| 13:00PM | 11:00AM | 🟢 Ideal Meeting Window |
| 14:00PM | 12:00PM | 🟢 Ideal Meeting Window |
| 15:00PM | 13:00PM | 🟢 Ideal Meeting Window |
| 16:00PM | 14:00PM | 🟢 Ideal Meeting Window |
| 17:00PM | 15:00PM | ⚪ Outside Work Hours |
| 18:00PM | 16:00PM | ⚪ Outside Work Hours |
| 19:00PM | 17:00PM | ⚪ Outside Work Hours |
| 20:00PM | 18:00PM | ⚪ Outside Work Hours |
| 21:00PM | 19:00PM | ⚪ Outside Work Hours |
| 22:00PM | 20:00PM | ⚪ Outside Work Hours |
| 23:00PM | 21:00PM | ⚪ Outside Work Hours |
Frequently Asked Questions
What is the time difference between IST and GST?
GST is 1 hour 30 minutes behind IST. When it is 12:00 PM (noon) in IST, the current synchronized time in GST is 10:30 AM.
What are the overlapping working hours between IST and GST?
There are 6 overlapping standard business hours (9:00 AM – 5:00 PM) between IST and GST. The optimal scheduling window is 11:00 AM – 5:00 PM in IST (9:00 AM – 3:00 PM in GST).
Does daylight saving time affect the conversion between IST and GST?
No. Neither IST nor GST observes daylight saving time; the offset difference remains constant throughout the year.
What regions and major cities observe IST and GST?
IST (India Standard Time) is primarily observed across South Asia (Republic of India & Sri Lanka) (key hubs include New Delhi, Mumbai, Bengaluru, Hyderabad). GST (Gulf Standard Time) is observed across Arabian Peninsula (United Arab Emirates & Sultanate of Oman) (key hubs include Dubai, Abu Dhabi, Muscat, Sharjah).
What is 9:00 AM IST in GST?
9:00 AM in IST corresponds to 7:30 AM in GST. You can cross-reference every hour of the day in the 24-hour visual schedule table above.
Which time zone is ahead, IST or GST?
IST is ahead by 1 hour and 30 minutes.