Timezone conversion
IST to BST Time — Convert India Standard Time to British Summer Time
BST is currently 4h30m behind IST. The gap shifts across the year: around January it is 5h30m behind IST, and around July it is 4h30m behind IST, because one or both zones observe daylight saving.
BST is currently 4h30m behind IST.
Abbreviation disambiguation
IST here means India Standard Time. Note: major collisions: Israel Standard Time (Asia/Jerusalem), Irish Standard Time (Europe/Dublin) — canonical=India, page must disambiguate
BST here means British Summer Time. Note: collision: Bangladesh Standard Time (Asia/Dhaka)
Interactive converter
12:00PM
Full IST to BST conversion table
| IST | BST |
|---|---|
| 12:00 AM | 7:30 PM(previous day) |
| 1:00 AM | 8:30 PM(previous day) |
| 2:00 AM | 9:30 PM(previous day) |
| 3:00 AM | 10:30 PM(previous day) |
| 4:00 AM | 11:30 PM(previous day) |
| 5:00 AM | 12:30 AM |
| 6:00 AM | 1:30 AM |
| 7:00 AM | 2:30 AM |
| 8:00 AM | 3:30 AM |
| 9:00 AM | 4:30 AM |
| 10:00 AM | 5:30 AM |
| 11:00 AM | 6:30 AM |
| 12:00 PM | 7:30 AM |
| 1:00 PM | 8:30 AM |
| 2:00 PM | 9:30 AM |
| 3:00 PM | 10:30 AM |
| 4:00 PM | 11:30 AM |
| 5:00 PM | 12:30 PM |
| 6:00 PM | 1:30 PM |
| 7:00 PM | 2:30 PM |
| 8:00 PM | 3:30 PM |
| 9:00 PM | 4:30 PM |
| 10:00 PM | 5:30 PM |
| 11:00 PM | 6:30 PM |
Daylight saving and how the gap changes
Around January the IST → BST offset is 5h30m behind IST. Around July it is 4h30m behind IST. That swing comes from one or both zones observing daylight saving on different schedules — the converter above always reflects the correct offset for the date you pick.
Frequently asked questions
- Is BST ahead of or behind IST right now?
- BST is currently 4h30m behind IST.
- What is the current IST to BST time difference?
- Right now the gap is 4h30m behind — BST is 4h30m behind IST.
- Does the IST → BST offset change during the year?
- Yes. Around January the offset is 5h30m behind IST; around July it is 4h30m behind IST. The converter above always reflects the correct offset for the date you pick.
- Does IST observe daylight saving time?
- No — India Standard Time stays at a fixed UTC offset year-round.
- Does BST observe daylight saving time?
- Yes — British Summer Time observes DST, so its UTC offset shifts by 1 hour(s) between winter and summer.
- What time is 9 AM IST in BST?
- 9:00 AM IST is 4:30 AM BST.
- What time is 12 PM (noon) IST in BST?
- 12:00 PM IST is 7:30 AM BST.
- What time is 5 PM IST in BST?
- 5:00 PM IST is 12:30 PM BST.
- When is the best time to schedule a call between IST and BST?
- The working-hours overlap (09:00–17:00 in both zones) runs roughly 1:30 PM – 5:00 PM IST (≈ 3.5 hours). Mid-morning IST is usually the safest window for a live call.
- What time zone does IST refer to?
- IST refers to India Standard Time (IANA: Asia/Kolkata).
- What time zone does BST refer to?
- BST refers to British Summer Time (IANA: Europe/London).
- Is IST on this page the same as other zones that share the letters "IST"?
- On Clockjumper, IST means India Standard Time. Disambiguation: major collisions: Israel Standard Time (Asia/Jerusalem), Irish Standard Time (Europe/Dublin) — canonical=India, page must disambiguate
- Is BST on this page the same as other zones that share the letters "BST"?
- On Clockjumper, BST means British Summer Time. Disambiguation: collision: Bangladesh Standard Time (Asia/Dhaka)