IST to BST Time Converter
British Summer Time (BST) is currently 4 hours 30 minutes behind India Standard Time (IST). IST is UTC+5:30 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 1:30 PM and 5:00 PM in IST, which is 9:00 AM to 12:30 PM in BST.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: IST 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?
IST and BST are fixed offsets, so the difference between them never changes.
This page covers India Standard Time, UTC+5:30, which has no daylight saving. IST can also refer to Irish Standard Time (UTC+1) or Israel Standard Time (UTC+2).
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 IST?
BST is currently 4 hours 30 minutes behind IST. IST and BST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in IST in BST?
9:00 AM in IST is 4:30 AM in BST.
What is the best time for a call between IST and BST?
Both sides are inside 9:00 AM to 5:00 PM office hours between 1:30 PM and 5:00 PM in IST, which is 9:00 AM to 12:30 PM in BST.