IST to GMT Converter
GMT is 5 hours and 30 minutes behind IST
IST to GMT Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in GMT
| IST | GMT |
|---|---|
| 12:00 AM | 6:30 PM -1d |
| 1:00 AM | 7:30 PM -1d |
| 2:00 AM | 8:30 PM -1d |
| 3:00 AM | 9:30 PM -1d |
| 4:00 AM | 10:30 PM -1d |
| 5:00 AM | 11:30 PM -1d |
| 6:00 AM | 12:30 AM |
| 7:00 AM | 1:30 AM |
| 8:00 AM | 2:30 AM |
| 9:00 AM | 3:30 AM |
| 10:00 AM | 4:30 AM |
| 11:00 AM | 5:30 AM |
| 12:00 PM | 6:30 AM |
| 1:00 PM | 7:30 AM |
| 2:00 PM | 8:30 AM |
| 3:00 PM | 9:30 AM |
| 4:00 PM | 10:30 AM |
| 5:00 PM | 11:30 AM |
| 6:00 PM | 12:30 PM |
| 7:00 PM | 1:30 PM |
| 8:00 PM | 2:30 PM |
| 9:00 PM | 3:30 PM |
| 10:00 PM | 4:30 PM |
| 11:00 PM | 5:30 PM |
Converting India Standard Time to Greenwich Mean Time
India Standard Time (IST) and Greenwich Mean Time (GMT) are separated by a 5 hours and 30 minutes time difference. GMT is 5 hours and 30 minutes behind IST. IST is UTC+5:30, used in India, Sri Lanka, while GMT is UTC+0, used in United Kingdom, Ireland, Portugal.
When converting from IST to GMT, the key reference points to remember are: 9:00 AM IST equals 3:30 AM GMT, 12:00 PM noon IST equals 6:30 AM GMT, and 5:00 PM IST equals 11:30 AM GMT. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across IST and GMT
For professionals scheduling meetings between IST and GMT, finding overlapping business hours is essential. Standard business hours are typically 9:00 AM to 5:00 PM in each time zone. Given the 5 hours and 30 minutes difference, the window of overlap may be limited. Use the highlighted working hours in the conversion table above to quickly identify suitable meeting times.
Daylight Saving Time Considerations
IST does not observe Daylight Saving Time, maintaining UTC+5:30 year-round. GMT observes DST, switching to BST (UTC+1). During DST transitions, the time difference between these zones may temporarily change by 1 hour. Always verify the current offset during spring and fall transition periods.