GSTtoISTGulf Standard Time to India Standard Time
GST
Gulf Standard Time (GMT+4)IST
India Standard Time (GMT+5:30)Mutual Working Window: 7 Overlapping Hours
Recommended calling window between GST and IST
Both locations share 7 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 GST and IST.
| GST Time (Gulf Standard Time) | IST Time (India Standard Time) | Status & Recommendation |
|---|---|---|
| 00:00AM | 01:00AM | ⚪ Outside Work Hours |
| 01:00AM | 02:00AM | ⚪ Outside Work Hours |
| 02:00AM | 03:00AM | ⚪ Outside Work Hours |
| 03:00AM | 04:00AM | ⚪ Outside Work Hours |
| 04:00AM | 05:00AM | ⚪ Outside Work Hours |
| 05:00AM | 06:00AM | ⚪ Outside Work Hours |
| 06:00AM | 07:00AM | ⚪ Outside Work Hours |
| 07:00AM | 08:00AM | ⚪ Outside Work Hours |
| 08:00AM | 09:00AM | ⚪ Outside Work Hours |
| 09:00AM | 10:00AM | 🟢 Ideal Meeting Window |
| 10:00AM | 11:00AM | 🟢 Ideal Meeting Window |
| 11:00AM | 12:00PM | 🟢 Ideal Meeting Window |
| 12:00PM | 13:00PM | 🟢 Ideal Meeting Window |
| 13:00PM | 14:00PM | 🟢 Ideal Meeting Window |
| 14:00PM | 15:00PM | 🟢 Ideal Meeting Window |
| 15:00PM | 16:00PM | 🟢 Ideal Meeting Window |
| 16:00PM | 17:00PM | 🟡 Feasible (Shoulder Hour) |
| 17:00PM | 18:00PM | ⚪ Outside Work Hours |
| 18:00PM | 19:00PM | ⚪ Outside Work Hours |
| 19:00PM | 20:00PM | ⚪ Outside Work Hours |
| 20:00PM | 21:00PM | ⚪ Outside Work Hours |
| 21:00PM | 22:00PM | ⚪ Outside Work Hours |
| 22:00PM | 23:00PM | ⚪ Outside Work Hours |
| 23:00PM | 00:00AM | ⚪ Outside Work Hours |
Frequently Asked Questions
What is the time difference between GST and IST?
IST is 1 hour 30 minutes ahead of GST. When it is 12:00 PM (noon) in GST, the current synchronized time in IST is 1:30 PM.
What are the overlapping working hours between GST and IST?
There are 7 overlapping standard business hours (9:00 AM – 5:00 PM) between GST and IST. The optimal scheduling window is 9:00 AM – 4:00 PM in GST (10:00 AM – 5:00 PM in IST).
Does daylight saving time affect the conversion between GST and IST?
No. Neither GST nor IST observes daylight saving time; the offset difference remains constant throughout the year.
What regions and major cities observe GST and IST?
GST (Gulf Standard Time) is primarily observed across Arabian Peninsula (United Arab Emirates & Sultanate of Oman) (key hubs include Dubai, Abu Dhabi, Muscat, Sharjah). IST (India Standard Time) is observed across South Asia (Republic of India & Sri Lanka) (key hubs include New Delhi, Mumbai, Bengaluru, Hyderabad).
What is 9:00 AM GST in IST?
9:00 AM in GST corresponds to 10:30 AM in IST. You can cross-reference every hour of the day in the 24-hour visual schedule table above.
Which time zone is ahead, GST or IST?
IST is ahead by 1 hour and 30 minutes.