Convert IST to GMT Time
Convert India Standard Time (IST) to Greenwich Mean Time (GMT) time instantly. IST is strictly 5 hours and 30 minutes ahead of GMT. During British Summer Time (BST), the diff 24-hour comparative table, DST rules & meeting planner.
🔄 Timezone Converter
⬅️ All Timezones Hub📊 Time Difference & Regional Scope
India Standard Time (IST)
Greenwich Mean Time (GMT)
🕒 24-Hour Conversion Table: IST to GMT
Complete hour-by-hour comparative lookup table for international scheduling.
| IST Time (Origin) | IST Status | GMT Time (Converted) | GMT Status | Day Shift | Meeting Suitability |
|---|---|---|---|---|---|
| 12:00 AM | Sleep | 07:30 PM | Personal | Previous Day | ⚪ Off-Hours |
| 01:00 AM | Sleep | 08:30 PM | Personal | Previous Day | ⚪ Off-Hours |
| 02:00 AM | Sleep | 09:30 PM | Personal | Previous Day | ⚪ Off-Hours |
| 03:00 AM | Sleep | 10:30 PM | Sleep | Previous Day | ⚪ Off-Hours |
| 04:00 AM | Sleep | 11:30 PM | Sleep | Previous Day | ⚪ Off-Hours |
| 05:00 AM | Sleep | 12:30 AM | Sleep | Same Day | ⚪ Off-Hours |
| 06:00 AM | Sleep | 01:30 AM | Sleep | Same Day | ⚪ Off-Hours |
| 07:00 AM | Personal | 02:30 AM | Sleep | Same Day | ⚪ Off-Hours |
| 08:00 AM | Personal | 03:30 AM | Sleep | Same Day | ⚪ Off-Hours |
| 09:00 AM | Work | 04:30 AM | Sleep | Same Day | ⚪ Off-Hours |
| 10:00 AM | Work | 05:30 AM | Sleep | Same Day | ⚪ Off-Hours |
| 11:00 AM | Work | 06:30 AM | Sleep | Same Day | ⚪ Off-Hours |
| 12:00 PM | Work | 07:30 AM | Personal | Same Day | ⚪ Off-Hours |
| 01:00 PM | Work | 08:30 AM | Personal | Same Day | 🟢 Golden Overlap |
| 02:00 PM | Work | 09:30 AM | Work | Same Day | 🟢 Golden Overlap |
| 03:00 PM | Work | 10:30 AM | Work | Same Day | 🟢 Golden Overlap |
| 04:00 PM | Work | 11:30 AM | Work | Same Day | 🟢 Golden Overlap |
| 05:00 PM | Personal | 12:30 PM | Work | Same Day | 🟢 Golden Overlap |
| 06:00 PM | Personal | 01:30 PM | Work | Same Day | 🟢 Golden Overlap |
| 07:00 PM | Personal | 02:30 PM | Work | Same Day | 🟢 Golden Overlap |
| 08:00 PM | Personal | 03:30 PM | Work | Same Day | ⚪ Off-Hours |
| 09:00 PM | Personal | 04:30 PM | Work | Same Day | ⚪ Off-Hours |
| 10:00 PM | Sleep | 05:30 PM | Personal | Same Day | ⚪ Off-Hours |
| 11:00 PM | Sleep | 06:30 PM | Personal | Same Day | ⚪ Off-Hours |
📅 Global Meeting Planner
🌐 Popular UTC Reference Offsets
🌞 Upcoming DST Transitions
🕰️ Live World Clock Studio
Track real-time digital clocks across 40+ major global cities and timezones.
🌍 Popular Timezone Conversions
Overview & Capabilities
Convert India Standard Time (IST) to Greenwich Mean Time (GMT) time instantly with our dedicated time converter and international schedule planner. Designed for professionals and travelers located in New Delhi, Mumbai, Bengaluru planning communication with destinations in London, Dublin, Lisbon, this tool maps exact hour-by-hour calculations, Daylight Saving Time (DST) shifts, and mutually awake working hours.
Time Difference Summary: IST is strictly 5 hours and 30 minutes ahead of GMT. During British Summer Time (BST), the difference is 4 hours and 30 minutes.
Conversion Formula: GMT = IST - 5:30 hours (or IST - 4:30 hours during BST)
Recommended Meeting Window: 2:30 PM – 6:30 PM IST (corresponds to 9:00 AM – 1:00 PM GMT)Indian fintech, banking, and commerce teams syncing daily operations with London financial institutions.
How to Use
Key Features
Common Use Cases
Tips & Best Practices
Related Tools
GMT to IST Time Difference & Global Coordinator
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
Convert times between any two timezones instantly. See exact time differences, DST changes, 24-hr comparative lookup tables & business meeting planner.
CET to GMT Time Difference & Global Coordinator
Calculate GMT local time from Central European Time (CET). CET is strictly 1 hour ahead of Greenwich Mean Time (GMT) year-round. Business overlap matrix & enterprise schedule sync.
EST to GMT Converter
Convert Eastern Standard Time (EST) to Greenwich Mean Time (GMT) time instantly. EST is 5 hours behind GMT in winter (and 4 hours behind GMT/BST when daylight saving dates alig 24-hour comparative table, DST rules & meeting planner.
IST to AEDT Converter
Convert India Standard Time (IST) to Australian Eastern Daylight Time (AEDT) time instantly. AEDT (Australian Eastern Daylight Time, UTC+11) is 5 hours and 30 minutes ahead of IST. 24-hour comparative table, DST rules & meeting planner.
World Clock Online
Accurate live time across global cities and timezones. Interactive 24-hour timeline scrubber, international meeting planner matrix, and DST schedules.
Frequently Asked Questions
Q What is the exact time difference between India Standard Time (IST) and Greenwich Mean Time (GMT)?
IST is strictly 5 hours and 30 minutes ahead of GMT. During British Summer Time (BST), the difference is 4 hours and 30 minutes. IST is based on UTC+5:30, whereas GMT follows UTC+0 (switching to UTC+1 during summer Daylight Saving Time).
Q What time is 9:00 AM IST in GMT?
9:00 AM in IST converts according to the formula: `GMT = IST - 5:30 hours (or IST - 4:30 hours during BST)`. Use the 24-hour lookup table above to view the exact corresponding time and whether it lands on the same or previous day.
Q What is the best time for a conference call between IST and GMT?
The optimal meeting window is **2:30 PM – 6:30 PM IST (corresponds to 9:00 AM – 1:00 PM GMT)**. This ensures participants in both India & South Asia and United Kingdom, Ireland & Western Europe are awake and within active business hours.
Q Does Greenwich Mean Time (GMT) observe Daylight Saving Time?
Greenwich Mean Time observes Daylight Saving Time, causing the offset to shift by 1 hour during summer months.
Q Which major cities operate on IST and GMT?
Key cities in **IST** include **New Delhi, Mumbai, Bengaluru, Hyderabad, Chennai, Kolkata, Colombo**, while major centers in **GMT** include **London, Dublin, Lisbon, Edinburgh, Accra, Reykjavik**.
Q How can I calculate the reverse conversion from GMT to IST?
Use the interactive swap button between the timezones to convert in reverse instantly or click the **Switch Direction** button above.