Greenwich Mean Time to IST Conversion & Schedule Sync
Calculate IST local time from Greenwich Mean Time (GMT). GMT is 5 hours and 30 minutes behind IST. During British Summer Time (BST), the gap narrows to Business overlap matrix & enterprise schedule sync.
🔄 Timezone Converter
⬅️ All Timezones Hub📊 Time Difference & Regional Scope
Greenwich Mean Time (GMT)
India Standard Time (IST)
🕒 24-Hour Conversion Table: GMT to IST
Complete hour-by-hour comparative lookup table for international scheduling.
| GMT Time (Origin) | GMT Status | IST Time (Converted) | IST Status | Day Shift | Meeting Suitability |
|---|---|---|---|---|---|
| 12:00 AM | Sleep | 04:30 AM | Sleep | Same Day | ⚪ Off-Hours |
| 01:00 AM | Sleep | 05:30 AM | Sleep | Same Day | ⚪ Off-Hours |
| 02:00 AM | Sleep | 06:30 AM | Sleep | Same Day | ⚪ Off-Hours |
| 03:00 AM | Sleep | 07:30 AM | Personal | Same Day | ⚪ Off-Hours |
| 04:00 AM | Sleep | 08:30 AM | Personal | Same Day | ⚪ Off-Hours |
| 05:00 AM | Sleep | 09:30 AM | Work | Same Day | ⚪ Off-Hours |
| 06:00 AM | Sleep | 10:30 AM | Work | Same Day | ⚪ Off-Hours |
| 07:00 AM | Personal | 11:30 AM | Work | Same Day | ⚪ Off-Hours |
| 08:00 AM | Personal | 12:30 PM | Work | Same Day | 🟢 Golden Overlap |
| 09:00 AM | Work | 01:30 PM | Work | Same Day | 🟢 Golden Overlap |
| 10:00 AM | Work | 02:30 PM | Work | Same Day | 🟢 Golden Overlap |
| 11:00 AM | Work | 03:30 PM | Work | Same Day | 🟢 Golden Overlap |
| 12:00 PM | Work | 04:30 PM | Work | Same Day | 🟢 Golden Overlap |
| 01:00 PM | Work | 05:30 PM | Personal | Same Day | 🟢 Golden Overlap |
| 02:00 PM | Work | 06:30 PM | Personal | Same Day | 🟢 Golden Overlap |
| 03:00 PM | Work | 07:30 PM | Personal | Same Day | 🟢 Golden Overlap |
| 04:00 PM | Work | 08:30 PM | Personal | Same Day | ⚪ Off-Hours |
| 05:00 PM | Personal | 09:30 PM | Personal | Same Day | ⚪ Off-Hours |
| 06:00 PM | Personal | 10:30 PM | Sleep | Same Day | ⚪ Off-Hours |
| 07:00 PM | Personal | 11:30 PM | Sleep | Same Day | ⚪ Off-Hours |
| 08:00 PM | Personal | 12:30 AM | Sleep | Next Day | ⚪ Off-Hours |
| 09:00 PM | Personal | 01:30 AM | Sleep | Next Day | ⚪ Off-Hours |
| 10:00 PM | Sleep | 02:30 AM | Sleep | Next Day | ⚪ Off-Hours |
| 11:00 PM | Sleep | 03:30 AM | Sleep | Next Day | ⚪ Off-Hours |
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Overview & Capabilities
Coordinate distributed operations and international deliverables between Greenwich Mean Time (GMT) and India Standard Time (IST) using our multi-region time sync console. Whether managing remote sprints from London, Dublin, Lisbon, delegating tasks to counterparts in New Delhi, Mumbai, Bengaluru, or standardizing system schedules across India & South Asia, this reference delivers verified time offsets, cross-border meeting windows, and seasonal clock changes.
Synchronized Offset: GMT is 5 hours and 30 minutes behind IST. During British Summer Time (BST), the gap narrows to 4 hours and 30 minutes.
Time Adjustment: IST = GMT + 5:30 hours (or GMT + 4:30 hours during BST)
Optimal Calling Slot: 9:00 AM – 1:00 PM GMT (corresponds to 2:30 PM – 6:30 PM IST)UK executives, legal advisors, and consultants managing Indian corporate branches and client engagements.
How to Use
Key Features
Common Use Cases
Tips & Best Practices
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Frequently Asked Questions
Q How many hours difference is there between Greenwich Mean Time (GMT) and India Standard Time (IST)?
GMT is 5 hours and 30 minutes behind IST. During British Summer Time (BST), the gap narrows to 4 hours and 30 minutes. GMT operates at UTC+0, while IST runs at UTC+5:30.
Q When it is 5:00 PM in GMT, what time is it in IST?
To determine 5:00 PM GMT in IST, apply the formula `IST = GMT + 5:30 hours (or GMT + 4:30 hours during BST)`. Consult the 24-hour table above to see the exact time and whether the date rolls over.
Q What is the most effective meeting time between teams in GMT and IST?
The golden collaboration window is **9:00 AM – 1:00 PM GMT (corresponds to 2:30 PM – 6:30 PM IST)**, which represents the best balance of active working hours across both territories.
Q Does Greenwich Mean Time (GMT) change its clocks for Daylight Saving Time?
Greenwich Mean Time participates in Daylight Saving Time, moving clocks forward 1 hour in spring and backward in autumn.
Q What are the primary economic centers in GMT and IST?
Major hubs in **GMT** include **London, Dublin, Lisbon, Edinburgh, Accra, Reykjavik**, while primary hubs in **IST** include **New Delhi, Mumbai, Bengaluru, Hyderabad, Chennai, Kolkata, Colombo**.
Q Can I convert backwards from IST to GMT?
Use the interactive swap button between the timezones to convert in reverse instantly or click the **Switch Direction** button above.