Best Time to Call the UK from India

The short answer

For a call that sits inside normal working hours on both sides, aim for 2:30 PM to 6:00 PM IST in winter, which is 9:00 AM to 12:30 PM in the UK. In summer the window opens an hour earlier for India and runs from 1:30 PM to 6:00 PM IST, which is 9:00 AM to 1:30 PM British Summer Time. India gets the late afternoon, the UK gets the morning, and nobody is working past their evening.

Compared with the India-US pairing, this is an easy one. The two countries share part of the same working day, and the only real constraint is that the UK morning is India's afternoon. If you also deal with the US, our guide to calling India from the US covers the harder evening-only window.

Winter and summer: when the gap changes

The UK puts its clocks forward by one hour on the last Sunday of March and back on the last Sunday of October. In 2026 those dates are Sunday March 29 and Sunday October 25; in 2027 the clocks go forward again on Sunday March 28. India does nothing on any of those dates, so for the UK it is the UK clock that creates the new gap.

As of this month (November 2026) the UK is on GMT, so India is 5.5 hours ahead. That stays true until March 28, 2027. Many people remember the rule as "India is five and a half hours ahead", which is only correct from late October to late March. From the last Sunday of March the number you want is four and a half.

The week where the numbers go wrong

The first Monday after a change is where invites break. A recurring "3:00 PM IST" call that was 9:30 AM in London on Friday, March 27, 2026 becomes 10:30 AM London time on Monday, March 30, unless the invite was created in the UK time zone and follows the UK clock. Decide in advance which side owns the clock. If the UK side owns it, the Indian participants' local time shifts by an hour in March and October; if India owns it, the UK participants' local time shifts. Both are fine as long as it is a conscious choice and nobody learns about it on the day.

A 9-to-5 overlap table for both seasons

Most UK offices run roughly 9:00 AM to 5:00 PM and most Indian offices 9:00 AM or 10:00 AM to 6:00 PM. Lining those up gives the following shared window.

Two more things shape the window. UK lunch is typically 12:00 to 2:00 PM, so the last hour of the winter overlap is often the one where UK colleagues are away from their desks. And India's day does not usually end at 6:00 PM on the dot for support and IT teams; many run to 7:00 or 8:00 PM, which pushes the real overlap an hour or two later.

UK time converted to IST

Use this when you are the one writing the invite from the UK side.

IST converted to UK time

Use this when the Indian side is picking the slot. The shaded rows are comfortable for both sides.

Choosing the right hour inside the window

Having a window is not the same as having a good slot. The UK morning is when people are freshest and have not yet been pulled into the day's meetings; for India it is mid-to-late afternoon, a decent time but not a particularly fresh one. A few patterns hold up well in practice.

• Decision calls and workshops: UK 10:00 AM to 12:00 noon. In winter that is 3:30 to 5:30 PM IST; in summer 2:30 to 4:30 PM IST. Both sides are on and the call can finish before India's evening commute.
• Daily stand-ups: UK 9:30 AM, which is 3:00 PM IST in winter and 2:00 PM IST in summer. Short, early, and out of the way of lunch on both sides.
• Handover from India to the UK: A written handover by 2:30 PM IST gives UK colleagues their whole morning with fresh information.
• Handover from the UK to India: Send it by 1:00 PM UK time, because that is 6:30 PM IST in winter and 5:30 PM in summer, and the Indian team still has time to read it and ask a question.

Friday is shorter than it looks

A UK Friday at 2:00 PM is 7:30 PM IST in winter, and by 5:00 PM it is 10:30 PM on a Friday night in India. In practice the working Friday overlap ends around 12:30 PM UK time. Anything that needs a joint decision should be done before lunch on Friday, otherwise it waits until Monday. Our remote work time zone guide covers how teams handle this when more regions are involved.

Early and late stretches

If the window is not enough, stretch on the Indian side first. An Indian colleague staying until 7:30 PM IST is on a call at 2:00 PM GMT (3:00 PM BST in summer), which is perfectly normal in the UK. Asking the UK side to start early is harder: 8:00 AM GMT is 1:30 PM IST, which works, but anything before 8:00 AM UK time asks someone to be online before their commute. There is no sensible stretch past 5:00 PM UK time, because that is already 10:30 PM in India in winter.

Bank holidays and public holidays: the part calendars miss

Calendars show your own holidays, but they do not show the other side's unless someone adds them. Between India and the UK the mismatch is large, because the two calendars have almost nothing in common.

The UK has eight regular bank holidays a year in England and Wales, with Scotland and Northern Ireland adding or substituting their own. When Christmas or New Year's Day lands on a weekend, a substitute weekday is given. India has three national holidays (Republic Day on January 26, Independence Day on August 15 and Gandhi Jayanti on October 2), plus a regional set that varies by state and by company. Festivals such as Holi and Diwali follow the lunar calendar and move every year; Diwali in 2026 falls on November 8.

The tables above are for England and Wales. Scotland and Northern Ireland differ: for example, Scotland observes January 2 and a different August holiday, and Northern Ireland observes March 17 and July 12. If your UK counterpart is in Edinburgh or Belfast, ask rather than assume. For Indian holidays, ask the specific office: a Bengaluru team and a Kolkata team will not share Pongal, Durga Puja or Onam.

A practical habit that costs almost nothing is to add the other side's public holidays to a shared team calendar at the start of each year and again whenever a new city joins. A single missed bank holiday can cost a week of lead time on a delivery.

How to write a scheduling email that cannot be misread

Most missed calls between India and the UK are not caused by arithmetic. They are caused by an ambiguous sentence. A few conventions remove almost all of the risk.

Always write both times, with the date and weekday

Instead of "Let's talk tomorrow at 3," write: "Thursday, March 5 at 10:00 AM GMT (3:30 PM IST)." The weekday catches typos in the date, and the pair of times lets the reader check your conversion without doing any sums. In summer, write the pair as "Thursday, June 11 at 10:00 AM BST (2:30 PM IST)."

Use the right abbreviation, or use UTC offsets

The abbreviations are shared with other places. BST means British Summer Time, but it is also Bangladesh Standard Time. IST means India Standard Time, but it is also Irish Standard Time and Israel Standard Time. If a recipient could reasonably confuse them, write the offset: 10:00 UTC+1 (15:30 UTC+5:30). Writing "UK time" and "India time" in plain words is often clearer than any abbreviation. The BST time now page shows the current British time at a glance.

Offer two or three options, not an open question

A good template: "Could we do Tuesday at 10:00 AM UK time (3:30 PM IST) or Wednesday at 11:00 AM UK time (4:30 PM IST)? If neither suits, send me two slots in your afternoon." It stays within the overlap, it is easy to accept, and the fallback request is phrased in the other person's own time zone.

Say which clock a recurring meeting follows

For recurring meetings, add one line: "This meeting is fixed to UK time; Indian start times move to 2:00 PM IST on March 29 and back to 3:00 PM IST on October 25." Putting the next two clock changes in the invite description takes ten seconds and prevents the March confusion described earlier. Our guide to meeting invites across time zones explains the calendar settings that make an invite follow the right clock.

Common mistakes to avoid

1. Using "5.5 hours" all year

From the last Sunday of March the gap is 4.5 hours. A meeting set up in February as "3:30 PM IST, 10:00 AM UK" will be an hour late for the UK in April unless the invite follows the UK clock.

2. Treating the UK as one time zone for all of the year

"GMT" is correct only in winter. In summer the UK is on BST, and calling it GMT, as many people do, produces a one-hour error. London in July is not on GMT, even though Greenwich is where the prime meridian passes.

3. Ignoring the weeks when US and UK clocks disagree

If a call includes the US, remember that the US changes its clocks on different dates from the UK. In 2026 the US moved on March 8, three weeks before the UK on March 29, and returns to standard time on November 1, a week after the UK did on October 25. In those short windows the UK-US gap is four hours instead of five, which can pull a three-way India-UK-US meeting out of its usual slot. Check the EST to IST converter before booking anything involving all three.

4. Scheduling in the UK afternoon

Anything after 1:00 PM UK in winter means 6:30 PM IST or later. That is fine once; as a regular slot it wears out the Indian team quickly. Keep regular meetings in the UK morning.

5. Forgetting the Indian weekend is not always Saturday-Sunday

Many Indian companies work a six-day week or alternate Saturdays. If a UK team wants to reach India on a Saturday, confirm first, rather than assuming the office is shut or open.

One final check: before sending any invite, convert it once in each direction. The GMT to IST converter does this in a few seconds, and it uses the real time zone database, so it handles the March and October changes for you.

Frequently Asked Questions