JST to BST Time Converter
British Summer Time (BST) is currently 8 hours behind Japan Standard Time (JST). JST is UTC+9 and BST is UTC+1. The table below converts every hour of the day between the two, and the call planner shows where working hours line up.
Best Time for a Call
Both sides are inside 9:00 AM to 5:00 PM office hours between 5:00 PM and 5:00 PM in JST, which is 9:00 AM to 9:00 AM in BST.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: JST to BST
Rows marked office hours fall between 9:00 AM and 5:00 PM in both places. For a specific date, use the interactive converter.
Does the Difference Change During the Year?
JST and BST are fixed offsets, so the difference between them never changes.
JST is UTC+9. Japan has no daylight saving, so this offset never changes.
BST is UTC+1, used in the UK from late March to late October. In winter the UK is on GMT. BST can also refer to Bangladesh Standard Time, which is UTC+6.
Frequently Asked Questions
How many hours behind is BST compared to JST?
BST is currently 8 hours behind JST. JST and BST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in JST in BST?
9:00 AM in JST is 1:00 AM in BST.
What is the best time for a call between JST and BST?
Both sides are inside 9:00 AM to 5:00 PM office hours between 5:00 PM and 5:00 PM in JST, which is 9:00 AM to 9:00 AM in BST.