IST to GMT converter
India Standard Time → UK Time
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India Standard Time (IST) is UTC+5:30 with no daylight saving. It covers Mumbai, Delhi, Bengaluru and Chennai.
UK Time (GMT) is UTC+0 and observes British Summer Time (BST, UTC+1, roughly March–October). It covers London, Manchester and Edinburgh.
UK Time is typically 5½ hours behind India Standard Time, though daylight saving can shift the difference by an hour at some times of year.
Best time to call UK Time from India Standard Time
Office hours overlap for about 2.5 hours a day: 2:30 PM–5:00 PM in India Standard Time is 9:00 AM–11:30 AM in UK Time. Book calls inside this window and nobody is out of hours. Daylight saving can shift these times by an hour at some points in the year.
IST to GMT, hour by hour
Today's actual offsets. Rows where both zones are inside 9am–5pm working hours are highlighted.