Timezone conversion
IST to BST Time — Convert India Standard Time to British Summer Time
BST is currently 4 hours and 30 minutes behind IST. The gap shifts across the year: around January BST is 5 hours and 30 minutes behind IST, and around July it is 4 hours and 30 minutes behind IST, because one or both zones observe daylight saving.
BST is currently 4 hours and 30 minutes behind IST.
Abbreviation disambiguation
On Clockjumper, IST refers to India Standard Time (UTC+5:30). The same three letters are also used for Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1) — check the city or UTC offset to be sure which is meant.
On Clockjumper, BST refers to British Summer Time (UTC+1), the UK's daylight-saving offset. The same letters are also used locally for Bangladesh Standard Time (UTC+6) — check the city or UTC offset to be sure which is meant.
Interactive converter
12:00PM
Select both cities to see the converted time.
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 BST is 5 hours and 30 minutes behind IST. Around July it is 4 hours and 30 minutes 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 4 hours and 30 minutes behind IST.
- What is the current IST to BST time difference?
- Right now the gap is 4 hours and 30 minutes — BST is 4 hours and 30 minutes behind IST.
- Does the IST → BST offset change during the year?
- Yes. Around January BST is 5 hours and 30 minutes behind IST; around July it is 4 hours and 30 minutes 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?
- BST is itself the daylight-saving form. British Summer Time is in force at UTC+1 through the summer months; outside that window the same zone is on GMT (UTC+0).
- What time is 3 AM IST in BST?
- 3:00 AM IST is 10:30 PM (previous day) BST.
- What time is 8 AM IST in BST?
- 8:00 AM IST is 3:30 AM BST.
- What time is 9 AM IST in BST?
- 9:00 AM IST is 4:30 AM BST.
- What time is 10 AM IST in BST?
- 10:00 AM IST is 5:30 AM BST.
- What time is 11 AM IST in BST?
- 11:00 AM IST is 6:30 AM BST.
- What time is 12 PM (noon) IST in BST?
- 12:00 PM IST is 7:30 AM BST.
- What time is 2 PM IST in BST?
- 2:00 PM IST is 9:30 AM BST.
- What time is 3 PM IST in BST?
- 3:00 PM IST is 10:30 AM BST.
- What time is 4 PM IST in BST?
- 4:00 PM IST is 11:30 AM BST.
- What time is 5 PM IST in BST?
- 5:00 PM IST is 12:30 PM BST.
- What time is 9 PM IST in BST?
- 9:00 PM IST is 4:30 PM BST.
- What time is 10 PM IST in BST?
- 10:00 PM IST is 5:30 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 hours and 30 minutes). The midpoint of that window — 3:15 PM IST, 10:45 AM BST — is the safest single slot to propose 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 refers to India Standard Time (UTC+5:30). The same three letters are also used for Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1) — check the city or UTC offset to be sure which is meant.
- Is BST on this page the same as other zones that share the letters "BST"?
- On Clockjumper, BST refers to British Summer Time (UTC+1), the UK's daylight-saving offset. The same letters are also used locally for Bangladesh Standard Time (UTC+6) — check the city or UTC offset to be sure which is meant.