What is the time difference between GST and IST?

India Standard Time (IST) is 1 hours and 30 minutes ahead of Gulf Standard Time (GST). GST uses a UTC offset of UTC+4, while IST uses UTC+5:30. For example, when it's 9:00 AM in GST, it's 10:30 AM in IST. This difference remains constant year-round since neither timezone observes daylight saving time. Use the conversion table above to see the exact time for each hour of the day.

How do I convert GST to IST?

To convert GST to IST, add 1 hours and 30 minutes to the GST time. For example, 9:00 AM GST is 10:30 AM IST, and 5:00 PM GST is 6:30 PM IST. Since neither timezone observes DST, this conversion stays the same all year. You can also use the interactive converter above for quick, accurate results.

What time is it in IST when it's noon in GST?

When it's 12:00 PM (noon) in GST, it's 1:30 PM in IST. This is because IST is 1 hours and 30 minutes ahead of GST. Similarly, when it's 6:00 PM in GST, it's 7:30 PM in IST. This relationship is constant throughout the year. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours ahead is IST from GST?

IST is 1 hours and 30 minutes ahead of GST. This means when it's 9:00 AM in GST, it's 10:30 AM in IST, and when it's midnight in GST, it's 1:30 AM in IST. This offset is constant throughout the year since neither timezone uses daylight saving time. The conversion table above provides a complete hour-by-hour mapping.

Is IST ahead or behind GST?

IST is ahead of GST by 1 hours and 30 minutes. Clocks in IST show a later time than GST, meaning the day starts earlier in IST relative to GST. For example, when it's morning in GST, it's later in the morning in IST. This difference stays the same year-round.

Does GST observe daylight saving time?

No, Gulf Standard Time does not observe daylight saving time. The UTC offset of UTC+4 remains the same year-round, making time conversions from GST more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

Does IST observe daylight saving time?

No, India Standard Time does not observe daylight saving time. The UTC offset of UTC+5:30 remains the same year-round, making time conversions to IST more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

What is the best time to call from GST to IST?

The best time for a call between GST and IST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in IST during their work day, call between 7:30 AM and 3:30 PM your GST time. Avoid calling too early or late, as the 1 hours and 30 minutes difference means your evening could be their late night. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

Do GST and IST ever have the same time?

No, GST and IST are always 1 hours and 30 minutes apart and never display the same clock time simultaneously. Neither timezone observes DST, so the difference is constant year-round with no seasonal variation. The 1 hours and 30 minutes offset is determined by their fixed positions relative to the Prime Meridian (UTC). You can always rely on this consistent difference when planning across these timezones.

GST to IST Converter

Convert Gulf Standard Time to India Standard Time. See the hour-by-hour conversion table below.

Timezone Details

Gulf Standard Time

10:04 AM

Saturday, April 4, 2026

GST (UTC+04:00)

India Standard Time

11:34 AM

Saturday, April 4, 2026

IST (UTC+05:30)

Difference: +1h 30m

GST DST: No

IST DST: No

24-Hour Overview

GST — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

IST — 24-hour overview

1a1a

4a4a

7a7a

10a10a

11a

12p

1p1p

4p4p

7p7p

10p10p

11p

12a

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

IST to GST EST to IST IST to EST PST to IST IST to PST GMT to IST IST to GMT IST to JST JST to IST

Cities in These Timezones

GST Cities

Dubai Abu Dhabi

IST Cities

Delhi Mumbai Kolkata Bangalore Chennai

More Tools

Compare GST & IST Plan a Meeting (GST & IST)See on Map

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Gulf Standard Time on Wikipedia India Standard Time on Wikipedia IANA Time Zone Database