Convert WET to IST Western European Time ↔ India Standard Time Free Online Secure
Type a time in WET and read it in IST straight away. The offset is +5:30 h, the arithmetic wraps at midnight, and the answer says which day it lands on.
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Through the day — Convert WET to IST (Western European Time ↔ India Standard Time)
| WET | IST |
|---|---|
| 00:00 | 05:30 |
| 03:00 | 08:30 |
| 06:00 | 11:30 |
| 09:00 | 14:30 |
| 12:00 | 17:30 |
| 15:00 | 20:30 |
| 18:00 | 23:30 |
| 21:00 | 02:30 |
Where these units come from
Until the middle of the nineteenth century every town kept its own noon, set by the sun overhead, and nobody minded that the next town was four minutes behind. Railways ended that: a timetable cannot be written for a hundred local noons. Britain put its railways on Greenwich time in 1847, and in 1884 the International Meridian Conference in Washington chose Greenwich as the prime meridian and sketched the twenty-four-hour scheme we still use. Greenwich Mean Time was the world's reference until 1972, when Coordinated Universal Time replaced it: UTC is kept by atomic clocks and tied back to the turning Earth by leap seconds. The abbreviations on this page name standard time — the winter setting — which is why each one is a fixed number of hours rather than something that drifts through the year.
Where you meet them
A time zone becomes real the moment two people in different places have to agree on one moment: a call between offices, a flight that lands before it took off, a market that opens while you are asleep, a deadline written in somebody else's afternoon. Server logs, train and flight schedules and anything stamped with a time are kept in UTC precisely so that the question can always be settled, no matter whose clock was on the wall.
Questions people ask
What about summer time?
The offsets here are standard-time offsets, the ones a zone keeps in winter. Where summer time is observed, the same places move one hour further on for part of the year and take a different name: Central European Time becomes Central European Summer Time, Eastern Standard Time becomes Eastern Daylight Time. The switching dates are not the same in every country, and the two hemispheres change in opposite months, so for a date inside a summer-time period add an hour to whichever side observes it.
Why isn't every difference a whole number of hours?
Because offsets are decided by governments, not by geometry. India is half an hour off the hour, at UTC+05:30; Nepal is three quarters, at UTC+05:45; the Chatham Islands are at UTC+12:45. Any of these can be changed by law, and several countries have moved their offset within living memory.
Is the answer exact?
Where both units are defined in terms of one another by whole numbers, yes — the page says so above the figure, and the only rounding is in how many digits are shown. Where the ratio has no finite decimal, the page shows twelve significant digits and says the relation is approximate rather than pretending otherwise.
Does anything I type leave my device?
No. The arithmetic runs in your browser; nothing is uploaded and there is no server to upload it to. Load the page once and it keeps working with the network switched off.
The Test match at Lord’s, followed from Kolkata
A Test match between England and India begins at Lord’s at 11:00. The Wimbledon final starts on Sunday at 14:00. Questions in the House of Commons begin on Wednesday at 12:00. A reader in Mumbai, Kolkata or Chennai has to convert WET to IST, and on standard time the rule is: add five and a half hours. 11:00 WET becomes 16:30 IST, 14:00 WET becomes 19:30 IST, and 12:00 WET becomes 17:30 IST. India does not move its clocks, so the result changes only when Western Europe goes onto summer time: from 29 March to 24 October the difference is four and a half hours.
The page covers the rule, the tables and a description of the two zones, followed by episodes from cricket, tennis, politics, festivals and transport. The calculation takes place in your browser, and no figure is sent to a server.
Cricket at Lord’s
The timetable of a Test day
A Test match in July begins at 11:00 BST, which is 15:30 IST. The lunch interval, at 13:10 BST, is at 17:40 IST, the tea interval, at 15:40 BST, is at 20:10 IST, and the close of play, at 18:00 BST, is at 22:30 IST.
How to read it
Indian fans therefore follow the match from the afternoon into the night. A “convert WET to IST” calculation with the date in view shows that in summer the figure is four and a half hours, and in winter five and a half.
The Wimbledon final
The first serve
The men’s final begins at 14:00 BST, which is 18:30 IST. Spectators in India watch live in the evening, after work.
The women’s final
Saturday’s match starts at 14:00 BST, which is 18:30 IST. A “convert WET to IST” calculation shows at once that it falls at the Indian dinner hour.
Diwali in Leicester
Switching on the lights
The lights ceremony starts in the evening, at 18:00 GMT or BST, depending on the date. In October, at 18:00 BST, it is 22:30 IST; in November, at 18:00 GMT, it is 23:30 IST.
The fireworks
The fireworks at 20:30 GMT are at 02:00 IST the following night. Families in India watch live, in the middle of the night.
The House of Commons
Question time
The Wednesday sitting with questions to the prime minister begins at 12:00 WET, which is 17:30 IST. Indian journalists follow it live at the end of the working day.
Evening debates
A debate at 19:00 WET is at 00:30 IST the following night. A “convert WET to IST” calculation shows at once that it falls after the Indian midnight.
The Bank of England and the Indian market
The noon announcement
The interest-rate decision appears at 12:00 WET, which is 17:30 IST, after the Mumbai exchange, which closes at 15:30 IST.
The rupee’s reaction
The rupee reacts the next morning, at the 09:15 IST opening. A “convert WET to IST” calculation that is an hour out moves the announcement to another part of the evening.
New Year’s Eve in London
The fireworks on the Thames
The midnight fireworks, at 00:00 GMT, are at 05:30 IST on the morning of 1 January. Indians watch at dawn, with their first tea.
The evening programme
The concert at 22:00 GMT is at 03:30 IST. A “convert WET to IST” calculation made beforehand shows that it is a night broadcast.
Flights between London and Delhi
The evening departure
A flight from London to Delhi that leaves at 21:00 GMT and takes nearly nine hours lands at 11:30 IST the next day. The ticket shows 21:00 and 11:30, as for a journey of fourteen and a half hours, although the flight lasts nine.
The return
A flight from Delhi that leaves at 03:00 IST and takes nearly ten hours lands at 13:00 IST, which is 07:30 GMT. A “convert WET to IST” calculation shows the hour at which someone is waiting for you at Heathrow.
How to convert WET to IST: the rule, the date, the check
The rule
The Indian clock runs five and a half hours ahead of London, Dublin and Lisbon. Take the European time on a 24-hour clock and increase it by 5:30; the minutes move along with the hours.
The date
A total of 24:00 or more means the next day: subtract 24. 18:45 WET gives 24:15, so 00:15 IST tomorrow; 22:00 WET gives 27:30, so 03:30 IST tomorrow.
The check
00:30 WET is 06:00 IST. 06:00 WET is 11:30 IST. 09:45 WET is 15:15 IST. 12:00 WET is 17:30 IST. 15:30 WET is 21:00 IST. In summer, 12:00 BST is 16:30 IST.
The British Isles and Iberia on the clock
The three names
GMT in the United Kingdom and Ireland, WET in mainland Portugal, Madeira, the Canaries and the Faroes: all mean UTC+0. In summer all advance an hour, at 01:00 UTC, on the last Sundays of March and October.
The two exceptions
Iceland keeps UTC+0 all year, so it stays five and a half hours from India. The Azores, on UTC−1 in winter, are six and a half hours away.
The clock of a one-zone country
The same clock from Gujarat to Assam
India has never moved to summer time and uses UTC+5:30 across the whole country. The half hour changes the minutes of the result: 09:15 WET becomes 14:45 IST.
The neighbouring countries
Sri Lanka has the same hour. Nepal sits at UTC+5:45, Pakistan at UTC+5 and Bangladesh at UTC+6.
Five and a half hours between two working days
How the days line up
When people in a London firm sit down at 09:00, their colleagues in Mumbai read 14:30 on the wall; when the Londoners leave at 17:00, Mumbai reads 22:30. The Indian day (09:00 to 17:00) falls between 03:30 and 11:30 on London’s dial. Only the stretch from 14:30 to 17:00 IST is shared.
The best time to ring
Ring India from London at 09:00 WET and you reach 14:30 IST, the middle of their afternoon. Ring at 16:00 WET and you reach 21:30 IST, when many are going home for dinner.
A journey with a stop
A traveller leaving Lisbon at 08:00 WET on a flight of nearly twelve hours with one stop lands at 20:00 WET, which is 01:30 IST the next day. The ticket reads 08:00 and 01:30, as for a trip of seventeen and a half hours.
Goa and Lisbon
The Portuguese ties
Goa was long a Portuguese colony, and Goan communities in Lisbon hold celebrations on Portuguese time. A service at 11:00 WET is at 16:30 IST.
The festival programme
A concert at 20:00 WET is at 01:30 IST the following night. A “convert WET to IST” calculation shows at once that the Indian day of the festival ends in the night.
The same British hour, four moments of the year
January
On Tuesday 6 January, 12:00 GMT means 17:30 IST, so five and a half hours.
The turn of March
On Tuesday 24 March, 12:00 GMT still means 17:30 IST. On Tuesday 31 March, 12:00 BST means 16:30 IST, because Western Europe advanced its clocks on 29 March and India did not.
Summer
On Tuesday 28 July, 12:00 BST means 16:30 IST, so four and a half hours.
Autumn
On Tuesday 27 October, 12:00 GMT means 17:30 IST again, after Britain’s return to standard time on 25 October. So does Tuesday 22 December.
The few months with an hour less
The interval
Between 29 March and 24 October the British and Portuguese clocks are advanced and the Indian one is not. The distance between WET and IST then falls to four and a half hours.
What to do
A “convert WET to IST” calculation made with the winter figure gives, in this interval, a result an hour too high. Subtract an hour and the result is right.
Mixed teams in Lisbon and Bangalore
The right hour for both
Colleagues in the two cities can talk at 09:30 WET, which is 15:00 IST. The Portuguese start their day, the Indians are halfway through theirs.
What stays in writing
Work that ends at 17:00 IST reaches Lisbon at 11:30 WET. A “convert WET to IST” calculation made at each handover shows that the result fits into the Portuguese day.
Trooping the Colour, in June
The sovereign’s birthday parade
The parade sets off around 11:00 BST, which is 15:30 IST. Indian spectators watch live in the afternoon.
The flypast over the palace
The flypast over Buckingham Palace, toward 13:00 BST, is at 17:30 IST. A “convert WET to IST” calculation shows at once that it falls toward the end of the Indian day.
Henley Royal Regatta
The morning races
The first races start at 10:00 BST, which is 14:30 IST. Rowing fans in India catch them in the first part of the afternoon.
The finals
Sunday’s finals, around 15:00 BST, are at 19:30 IST. For India it is an evening broadcast.
Opera at Glyndebourne
An evening of opera
Performances often begin at 17:30 BST, which is 22:00 IST. Indian audiences watch the broadcast late in the evening.
The long interval
The dinner interval, from 19:20 BST, is at 23:50 IST. A “convert WET to IST” calculation made beforehand shows that the second half falls after the Indian midnight.
When the gap is not the usual one
The year in segments
The difference between WET and IST depends on the date. In 2026: 1 January to 28 March and 25 October to 31 December — IST runs 5 hours 30 minutes ahead of WET; 29 March to 24 October — IST runs 4 hours 30 minutes ahead of WET.
How to apply it
In the summer periods the labels are WEST and IST. The calculator above uses the winter gap of 5 hours 30 minutes. For other dates, adjust the result by the difference between that figure and the gap listed for the period. Before you convert WET to IST, find the period that contains your date.
Every hour in one table
WET to IST
00:00 WET is 05:30 IST. 01:00 WET is 06:30 IST. 02:00 WET is 07:30 IST. 03:00 WET is 08:30 IST. 04:00 WET is 09:30 IST. 05:00 WET is 10:30 IST. 06:00 WET is 11:30 IST. 07:00 WET is 12:30 IST. 08:00 WET is 13:30 IST. 09:00 WET is 14:30 IST. 10:00 WET is 15:30 IST. 11:00 WET is 16:30 IST. 12:00 WET is 17:30 IST. 13:00 WET is 18:30 IST. 14:00 WET is 19:30 IST. 15:00 WET is 20:30 IST. 16:00 WET is 21:30 IST. 17:00 WET is 22:30 IST. 18:00 WET is 23:30 IST. 19:00 WET is 00:30 IST (next day). 20:00 WET is 01:30 IST (next day). 21:00 WET is 02:30 IST (next day). 22:00 WET is 03:30 IST (next day). 23:00 WET is 04:30 IST (next day).
How to read it
Each row pairs one WET hour with the matching IST hour and says when the date changes. The rows follow the same rule that applies when you convert WET to IST. Unlike most pairs, the minutes change here by thirty: :00 turns into :30, :30 turns into :00 and the hour moves with it. Read these rows as standard-time values and check the period section for dates where the difference changes.
The :30 rows
WET to IST, thirty minutes past
00:30 WET is 06:00 IST. 01:30 WET is 07:00 IST. 02:30 WET is 08:00 IST. 03:30 WET is 09:00 IST. 04:30 WET is 10:00 IST. 05:30 WET is 11:00 IST. 06:30 WET is 12:00 IST. 07:30 WET is 13:00 IST. 08:30 WET is 14:00 IST. 09:30 WET is 15:00 IST. 10:30 WET is 16:00 IST. 11:30 WET is 17:00 IST. 12:30 WET is 18:00 IST. 13:30 WET is 19:00 IST. 14:30 WET is 20:00 IST. 15:30 WET is 21:00 IST. 16:30 WET is 22:00 IST. 17:30 WET is 23:00 IST. 18:30 WET is 00:00 IST (next day). 19:30 WET is 01:00 IST (next day). 20:30 WET is 02:00 IST (next day). 21:30 WET is 03:00 IST (next day). 22:30 WET is 04:00 IST (next day). 23:30 WET is 05:00 IST (next day).
Purpose of the list
These are the readings people forget to check: events at :30. Look up the WET time and read the IST time beside it instead of repeating the calculation. These rows use the standard (winter) gap; on the dates listed in the period section the gap is different.
Readings that are not round
WET to IST, with minutes
01:05 WET is 06:35 IST. 03:20 WET is 08:50 IST. 05:50 WET is 11:20 IST. 07:35 WET is 13:05 IST. 10:10 WET is 15:40 IST. 13:25 WET is 18:55 IST. 16:40 WET is 22:10 IST. 19:55 WET is 01:25 IST (next day). 22:15 WET is 03:45 IST (next day). 23:05 WET is 04:35 IST (next day).
A remark on the minutes
Use these when your time is not on the hour or half hour. Watch the minutes: a thirty-minute difference means :00 and :30 swap places and the hour is adjusted accordingly. Winter-time arithmetic applies to these rows; for the dates in the period section, correct the result accordingly.
Is it morning or night there?
WET hours and the day in IST
06:00 WET is 11:30 IST (morning). 08:00 WET is 13:30 IST (around midday). 10:00 WET is 15:30 IST (afternoon). 12:00 WET is 17:30 IST (afternoon). 14:00 WET is 19:30 IST (evening). 16:00 WET is 21:30 IST (evening). 18:00 WET is 23:30 IST (night). 20:00 WET is 01:30 IST (night). 22:00 WET is 03:30 IST (night).
A practical use
The list pairs a WET hour with its IST time and a plain word for the time of day. It tells you at once whether the person you call has had breakfast or gone to bed. These rows use the standard (winter) gap; on the dates listed in the period section the gap is different.
Before you convert WET to IST: a short checklist
Preparation
Read the labels
The Azores are not on WET: they sit one hour behind mainland Portugal. If a schedule says IST, make sure it comes from India: Israel and Ireland use those letters too, at other offsets.
Use a 24-hour clock
The 24-hour clock avoids a.m. and p.m. slips, so rewrite 4:30 p.m. as 16:30 before anything else. For example, 09:15 WET becomes 14:45 IST.
Finishing
The operation
Add 5 hours 30 minutes. If the result passes midnight, correct the date: readings from 18:30 fall on the next date.
A second example
An evening check: 22:40 WET gives 04:10 IST (next day).
Common slips when you convert WET to IST
Subtracting instead of adding
IST is in front of WET: expect a bigger number, not a smaller one.
Losing the date
A WET time from 18:30 moves to the next date. Forgetting to move the date leaves the result 24 hours wrong.
The standard figure in the wrong weeks
Do not assume that WET and IST are always the same distance apart; the period list above shows the exceptions.
Confusing the abbreviation
The Azores are not on WET: they sit one hour behind mainland Portugal. Take care: IST may refer to Ireland or Israel as well, but here it is Indian Standard Time.
Frequently asked questions
By how much do WET and IST differ?
5 hours 30 minutes, and IST is ahead of WET. That is the standard figure; on some dates in 2026 it differs, as the period list shows.
Which sum applies when I convert WET to IST?
Add 5 hours 30 minutes to the WET time, then fix the date if the result passes midnight.
How much is 09:00 WET in IST?
14:30 IST in the standard period.
Is the gap the same in every month?
No, it differs on some dates; the period list above shows which.
Is the time I enter sent anywhere?
No. Nothing leaves the page.
Related conversions
See also Convert WET to EST, Convert WET to CET, Convert PST to IST, Convert CET to IST, Convert IST to PST, Convert CET to WET, Convert PST to EET, Convert CET to PST, Convert WET to EET. The opposite direction is Convert IST to WET.
In brief, to convert WET to IST you add 5 hours 30 minutes, mind the date change and watch the weeks when the gap differs.