BST can mean 2 different things depending on where you are: British Summer Time (UTC+1); Bangladesh Standard Time (UTC+6). Each is explained below.
BST stands for British Summer Time and is UTC+1, which is 1 hour ahead of UTC.
BST is used only while daylight saving time is in effect. When it ends, the same places return to GMT (UTC+0).
Cities that use BST: London, UK, Edinburgh, Belfast, Glasgow, Manchester, Birmingham, UK, Liverpool.
| When it is… | 9:00 AM BST | 12:00 PM BST | 5:00 PM BST |
|---|---|---|---|
| UTC | 8:00 AM | 11:00 AM | 4:00 PM |
| PST (Pacific) | 12:00 AM | 3:00 AM | 8:00 AM |
| MST (Mountain) | 1:00 AM | 4:00 AM | 9:00 AM |
| CST (Central US) | 2:00 AM | 5:00 AM | 10:00 AM |
| EST (Eastern) | 3:00 AM | 6:00 AM | 11:00 AM |
| EET (Eastern Europe) | 10:00 AM | 1:00 PM | 6:00 PM |
| IST (India) | 1:30 PM | 4:30 PM | 9:30 PM |
| JST (Japan) | 5:00 PM | 8:00 PM | 1:00 AM (+1 day) |
| AEST (Sydney) | 6:00 PM | 9:00 PM | 2:00 AM (+1 day) |
BST stands for Bangladesh Standard Time and is UTC+6, which is 6 hours ahead of UTC.
This abbreviation is also used informally for Bangladesh Standard Time. The time zone database does not use it, so check the context.
| When it is… | 9:00 AM BST | 12:00 PM BST | 5:00 PM BST |
|---|---|---|---|
| UTC | 3:00 AM | 6:00 AM | 11:00 AM |
| PST (Pacific) | 7:00 PM (-1 day) | 10:00 PM (-1 day) | 3:00 AM |
| MST (Mountain) | 8:00 PM (-1 day) | 11:00 PM (-1 day) | 4:00 AM |
| CST (Central US) | 9:00 PM (-1 day) | 12:00 AM | 5:00 AM |
| EST (Eastern) | 10:00 PM (-1 day) | 1:00 AM | 6:00 AM |
| CET (Central Europe) | 4:00 AM | 7:00 AM | 12:00 PM |
| EET (Eastern Europe) | 5:00 AM | 8:00 AM | 1:00 PM |
| IST (India) | 8:30 AM | 11:30 AM | 4:30 PM |
| JST (Japan) | 12:00 PM | 3:00 PM | 8:00 PM |
| AEST (Sydney) | 1:00 PM | 4:00 PM | 9:00 PM |
BST can stand for British Summer Time; Bangladesh Standard Time.
British Summer Time is UTC+1. Bangladesh Standard Time is UTC+6.
BST is UTC+1 and GMT is UTC+0, a difference of 1 hour. Places that use both switch between them when daylight saving time starts and ends. The live line above shows which one applies right now.
It depends on context. Look at the place or the schedule the abbreviation comes from, or ask for the UTC offset to be written out, such as UTC+8 instead of CST.