IST to GMT Time Converter (Mumbai / Bengaluru to London)
Convert IST (India Standard Time, Mumbai / Bengaluru) to GMT (Greenwich Mean Time, London) instantly. View live clocks, 24-hour comparison table, best meeting overlap hours, and developer code snippets.
Interactive Hour Converter (IST → GMT)
Drag slider to test any hour24-Hour IST to GMT Time Conversion Table
Side-by-side hourly reference with business hours overlap indicators.
| IST (Mumbai / Bengaluru) | 24h | GMT (London) | 24h | Status in GMT |
|---|---|---|---|---|
| 12:30 AM | 00:30 | 8:00 PM | 20:00 | Awake / Flex |
| 1:30 AM | 01:30 | 9:00 PM | 21:00 | Awake / Flex |
| 2:30 AM | 02:30 | 10:00 PM | 22:00 | Awake / Flex |
| 3:30 AM | 03:30 | 11:00 PM | 23:00 | Sleeping |
| 4:30 AM | 04:30 | 12:00 AM | 00:00 | Sleeping |
| 5:30 AM | 05:30 | 1:00 AM | 01:00 | Sleeping |
| 6:30 AM | 06:30 | 2:00 AM | 02:00 | Sleeping |
| 7:30 AM | 07:30 | 3:00 AM | 03:00 | Sleeping |
| 8:30 AM | 08:30 | 4:00 AM | 04:00 | Sleeping |
| 9:30 AM | 09:30 | 5:00 AM | 05:00 | Sleeping |
| 10:30 AM | 10:30 | 6:00 AM | 06:00 | Sleeping |
| 11:30 AM | 11:30 | 7:00 AM | 07:00 | Awake / Flex |
| 12:30 PM | 12:30 | 8:00 AM | 08:00 | Awake / Flex |
| 1:30 PM | 13:30 | 9:00 AM | 09:00 | Work Hours★ Best Meeting Overlap |
| 2:30 PM | 14:30 | 10:00 AM | 10:00 | Work Hours★ Best Meeting Overlap |
| 3:30 PM | 15:30 | 11:00 AM | 11:00 | Work Hours★ Best Meeting Overlap |
| 4:30 PM | 16:30 | 12:00 PM | 12:00 | Work Hours★ Best Meeting Overlap |
| 5:30 PM | 17:30 | 1:00 PM | 13:00 | Work Hours★ Best Meeting Overlap |
| 6:30 PM | 18:30 | 2:00 PM | 14:00 | Work Hours |
| 7:30 PM | 19:30 | 3:00 PM | 15:00 | Work Hours |
| 8:30 PM | 20:30 | 4:00 PM | 16:00 | Work Hours |
| 9:30 PM | 21:30 | 5:00 PM | 17:00 | Work Hours |
| 10:30 PM | 22:30 | 6:00 PM | 18:00 | Awake / Flex |
| 11:30 PM | 23:30 | 7:00 PM | 19:00 | Awake / Flex |
Developer Code Snippets (IST to GMT)
// Convert current time from IST (Asia/Kolkata) to GMT (Europe/London)
const now = new Date();
const inGMT = new Intl.DateTimeFormat('en-US', {
timeZone: 'Europe/London',
dateStyle: 'medium',
timeStyle: 'long'
}).format(now);
console.log(inGMT);# Python 3.9+ using standard zoneinfo
from datetime import datetime
from zoneinfo import ZoneInfo
dt_ist = datetime.now(ZoneInfo("Asia/Kolkata"))
dt_gmt = dt_ist.astimezone(ZoneInfo("Europe/London"))
print(f"IST: {dt_ist.strftime('%Y-%m-%d %H:%M %Z')}")
print(f"GMT: {dt_gmt.strftime('%Y-%m-%d %H:%M %Z')}")Frequently Asked Questions (IST → GMT)
How do I convert IST to GMT?
IST (India Standard Time) uses the IANA timezone identifier Asia/Kolkata (standard offset +05:30), while GMT (Greenwich Mean Time) uses Europe/London (standard offset +00:00). Use the interactive slider or the 24-hour table above to convert any hour accurately with automatic Daylight Saving Time (DST) adjustment.
What are the best meeting hours between Mumbai / Bengaluru and London?
Check the rows highlighted with "Best Meeting Overlap" in the 24-hour table above, where both IST and GMT fall within standard 9:00 AM – 5:00 PM working hours.
Does IST to GMT account for Daylight Saving Time (DST)?
Yes. Castov uses the browser's native IANA tzdb engine (Asia/Kolkata and Europe/London), which automatically applies official Daylight Saving Time transitions.