Convert IST to WET India Standard Time ↔ Western European Time Free Online Secure
Type a time in IST and read it in WET 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 IST to WET (India Standard Time ↔ Western European Time)
| IST | WET |
|---|---|
| 00:00 | 18:30 |
| 03:00 | 21:30 |
| 06:00 | 00:30 |
| 09:00 | 03:30 |
| 12:00 | 06:30 |
| 15:00 | 09:30 |
| 18:00 | 12:30 |
| 21:00 | 15:30 |
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.
India’s vote count, read in London
The counting of votes in India’s general election begins at 08:00. The final of a cricket tournament in India starts in the evening, at 19:00. The Eid prayer at Delhi’s great mosque begins at 08:00. Anyone living in London, Dublin or Lisbon who wants to know what the clock says at home at those moments will convert IST to WET. In winter time the calculation is a subtraction: five and a half hours. 08:00 IST becomes 02:30 WET, 19:00 IST becomes 13:30 WET, and 05:15 IST slips back to the previous evening, at 23:45 WET. Any Indian time before 05:30 belongs to the previous day in Western Europe. Between 29 March and 24 October, when Western Europe is on summer time, only four and a half hours are subtracted.
We begin with Indian events that are followed in Britain, Ireland and Portugal; after that come the rule, the lookup tables and a profile of each zone. All the arithmetic is done on your device.
India’s general election
The start of the count
Counting begins at 08:00 IST, which is 02:30 GMT in winter and 03:30 BST in summer. British correspondents follow it live at night or read the first results at breakfast.
The afternoon results
The general trend emerges toward 12:00 IST, which is toward 06:30 GMT. A “convert IST to WET” calculation made beforehand shows that the results appear at the start of the London morning.
A scheduled lunar landing
The time of the final manoeuvre
A landing manoeuvre scheduled for 18:04 IST, which is 12:34 UTC, is at 13:34 BST in summer or 12:34 GMT in winter. British space fans follow it live at lunchtime.
The press conference
The conference after the landing, at 19:30 IST, is at 14:00 GMT. A “convert IST to WET” calculation shows at once that it falls after the British lunch.
The cricket final, in English pubs
The start time
A final that starts at 19:00 IST starts at 13:30 GMT in winter and 14:30 BST in summer. British spectators watch at lunchtime or in the first part of the afternoon.
Evening matches
A game at 19:30 IST is at 14:00 GMT. A “convert IST to WET” calculation made in good time shows whether it is worth taking a long lunch break.
Onam in Kerala
The traditional feast
The festive meal begins at midday, around 12:30 IST, which is 08:00 BST. The Keralite community in Britain watches over breakfast.
Afternoon dances
Dances at 16:00 IST are at 11:30 BST. A “convert IST to WET” calculation shows at once that they fall in mid-morning in Britain.
The Taj Mahal at sunrise
Opening the monument
The monument opens at sunrise, around 06:00 IST, which is 00:30 GMT. Virtual visitors from Britain come in at dead of night.
Morning broadcasts
A broadcast at 07:30 IST is at 02:00 GMT. Photographers who want to see it live stay up.
Eid prayers
Prayer time
The morning prayer at Jama Masjid begins around 08:00 IST, which is 02:30 GMT or 03:30 BST, depending on the date. Believers in Britain follow it live before dawn.
The feast after prayer
The festive meal at 13:00 IST is at 07:30 GMT. A “convert IST to WET” calculation shows at once whether you can follow it before leaving for work.
Flights between Delhi and London
The night flight
A flight from Delhi to London that leaves at 02:00 IST and takes nearly ten hours lands at 12:00 IST, which is 06:30 GMT. The ticket shows 02:00 and 06:30, as for a flight of four and a half hours.
The afternoon flight
A flight from London that leaves at 13:00 GMT and takes nearly nine hours lands at 22:00 GMT, which is 03:30 IST the next day. A “convert IST to WET” calculation shows the hour at which someone is waiting at the airport.
How to convert IST to WET: three rules to remember
The first rule: subtraction
India’s clock runs five and a half hours ahead of the clock in London, Dublin and Lisbon. Take the Indian time on a 24-hour clock and subtract 5:30; the minutes move along with the hours.
The second rule: the date
A negative result means the previous day: add 24. For instance, 03:00 IST gives 21:30 WET yesterday and 05:15 IST gives 23:45 WET yesterday.
The third rule: the check
05:30 IST is 00:00 WET. 09:00 IST is 03:30 WET. 12:15 IST is 06:45 WET. 16:30 IST is 11:00 WET. 20:00 IST is 14:30 WET. 23:59 IST is 18:29 WET. In the European summer, 20:00 IST is 15:30 BST.
London, Dublin and Lisbon on the clock
Their winter time
The United Kingdom and Ireland call their winter clock GMT, mainland Portugal calls it WET, and Madeira, the Canaries and the Faroes keep the same. All sit on UTC+0 and advance an hour in summer.
The special cases
Iceland keeps UTC+0 in summer too, so against India it stays at five and a half hours. The Azores run on UTC−1 in winter, six and a half hours away, and on UTC+0 in summer.
Indians and a single clock
From Gujarat to Assam
Across the country the clock reads UTC+5:30, with no move to summer time at all. The half hour shows in the minutes: 19:15 IST becomes 13:45 WET.
Nearby countries
Sri Lanka keeps the same hour. Nepal has UTC+5:45, Pakistan UTC+5 and Bangladesh UTC+6.
Five and a half hours between the dials
Working hours
An Indian office open from 09:00 to 17:00 works, on London time, from 03:30 to 11:30. A London office open from 09:00 to 17:00 works from 14:30 to 22:30 on Indian time. The two days overlap for two and a half hours, from 09:00 to 11:30 WET.
Who rings first
A call from India at 15:00 IST rings at 09:30 WET, at the start of the London day. One from 20:00 IST rings at 14:30 WET, in the middle of the working day.
The flight with a stop
A flight with one stop from Mumbai to Lisbon that leaves at 04:00 IST and takes nearly twelve hours lands at 16:00 IST, which is 10:30 WET. The ticket shows 04:00 and 10:30, as for a trip of six and a half hours.
Banking services for Indians in Britain
Transfers
An Indian counter that accepts transfers until 16:00 IST accepts them until 10:30 WET. British customers must send the money in the morning.
Video appointments
An appointment given at 18:00 IST for a video call is at 12:30 WET. A “convert IST to WET” calculation made beforehand shows that it falls at midday.
The same Indian hour, four moments of the year
In January
On Sunday 11 January, an event at 20:00 IST takes place at 14:30 GMT: a difference of five and a half hours.
At the turn of March
On Sunday 22 March, the same Indian hour still reads 14:30 GMT. On Sunday 5 April it reads 15:30 BST, because Europe advanced its clocks on 29 March and India did not.
In high summer
On Sunday 2 August, 20:00 IST gives 15:30 BST, so four and a half hours.
Toward winter
On Sunday 1 November, 20:00 IST gives 14:30 GMT, after Britain’s return to standard time on 25 October. On Sunday 20 December the result is the same.
What happens between March and October
The figure falls
From the last Sunday of March to the last Sunday of October, Western Europe’s clock is an hour further forward. The distance to India therefore shrinks by an hour, to four and a half.
The correction
A “convert IST to WET” calculation made with the winter figure gives, in this interval, a result an hour too small. There is a single correction: add an hour.
Programmers in Bangalore, colleagues in Lisbon
The shared working window
A group with people in both cities meets at 15:00 IST, which is 09:30 WET. For the Indians it is mid-afternoon, for the Portuguese the start of the day.
Handing work over
Work that ends at 17:30 IST reaches Lisbon at 12:00 WET, in the middle of the Portuguese day. A written handover keeps the thread.
The Ganga Aarti at Varanasi
The evening ritual
The ceremony on the riverbank begins around 18:45 IST, which is 13:15 GMT in winter and 14:15 BST in summer. Virtual pilgrims in Britain watch live at lunchtime or in the afternoon.
The morning ritual
The ceremony at sunrise, around 05:30 IST, is at 00:00 GMT. A “convert IST to WET” calculation shows at once that in Britain it falls at midnight.
The Delhi Metro
The first and last trains
The first trains leave around 05:00 IST, which is 23:30 GMT on the previous day. The last leave around 23:00 IST, which is 17:30 GMT.
How to read it
A British tourist planning a day in Delhi has to note the local hours. A “convert IST to WET” calculation made beforehand shows which train catches the evening.
Yoga sessions in Rishikesh
Sunrise on the Ganges
A yoga session at 06:00 IST is at 00:30 GMT. Virtual participants in Britain watch live in their night or in the recording.
The evening session
The session at 17:30 IST is at 12:00 GMT. A “convert IST to WET” calculation shows at once that it falls at the British lunchtime.
Dhanteras and gold buying
When the shops open
Jewellers open on the morning of Dhanteras around 09:30 IST, which is 04:00 GMT or 05:00 BST, depending on the date. British Indians who shop by video call join in the early morning.
The auspicious hour
The best hour for buying is usually in the evening, from 18:30 IST, which is 13:00 GMT. A “convert IST to WET” calculation made with the date in view shows whether it falls at lunchtime or in the afternoon in Britain.
The weeks and months that need care
The year in segments
The difference between IST and WET depends on the date. In 2026: 1 January to 28 March and 25 October to 31 December: WET stands 5 hours 30 minutes behind IST; 29 March to 24 October: WET stands 4 hours 30 minutes behind IST.
What to do about it
Summer labels are IST and WEST. The form above applies the winter gap of 5 hours 30 minutes, so for other periods correct the answer by the difference from the figure listed. To convert IST to WET correctly, start by locating your date in this list.
The full day, hour by hour
IST hours and their WET equivalents
00:00 IST corresponds to 18:30 WET (previous day). 01:00 IST corresponds to 19:30 WET (previous day). 02:00 IST corresponds to 20:30 WET (previous day). 03:00 IST corresponds to 21:30 WET (previous day). 04:00 IST corresponds to 22:30 WET (previous day). 05:00 IST corresponds to 23:30 WET (previous day). 06:00 IST corresponds to 00:30 WET. 07:00 IST corresponds to 01:30 WET. 08:00 IST corresponds to 02:30 WET. 09:00 IST corresponds to 03:30 WET. 10:00 IST corresponds to 04:30 WET. 11:00 IST corresponds to 05:30 WET. 12:00 IST corresponds to 06:30 WET. 13:00 IST corresponds to 07:30 WET. 14:00 IST corresponds to 08:30 WET. 15:00 IST corresponds to 09:30 WET. 16:00 IST corresponds to 10:30 WET. 17:00 IST corresponds to 11:30 WET. 18:00 IST corresponds to 12:30 WET. 19:00 IST corresponds to 13:30 WET. 20:00 IST corresponds to 14:30 WET. 21:00 IST corresponds to 15:30 WET. 22:00 IST corresponds to 16:30 WET. 23:00 IST corresponds to 17:30 WET.
Reading the rows
Every line gives a IST time and the WET time at the same instant, with a note wherever the date moves. It is the quickest check when you convert IST to WET. 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.
The :30 rows
IST to WET, thirty minutes past
00:30 IST corresponds to 19:00 WET (previous day). 01:30 IST corresponds to 20:00 WET (previous day). 02:30 IST corresponds to 21:00 WET (previous day). 03:30 IST corresponds to 22:00 WET (previous day). 04:30 IST corresponds to 23:00 WET (previous day). 05:30 IST corresponds to 00:00 WET. 06:30 IST corresponds to 01:00 WET. 07:30 IST corresponds to 02:00 WET. 08:30 IST corresponds to 03:00 WET. 09:30 IST corresponds to 04:00 WET. 10:30 IST corresponds to 05:00 WET. 11:30 IST corresponds to 06:00 WET. 12:30 IST corresponds to 07:00 WET. 13:30 IST corresponds to 08:00 WET. 14:30 IST corresponds to 09:00 WET. 15:30 IST corresponds to 10:00 WET. 16:30 IST corresponds to 11:00 WET. 17:30 IST corresponds to 12:00 WET. 18:30 IST corresponds to 13:00 WET. 19:30 IST corresponds to 14:00 WET. 20:30 IST corresponds to 15:00 WET. 21:30 IST corresponds to 16:00 WET. 22:30 IST corresponds to 17:00 WET. 23:30 IST corresponds to 18:00 WET.
Purpose of the list
These are the readings people forget to check: events at :30. Look up the IST time and read the WET time beside it instead of repeating the calculation. The gap used here is the standard winter one; the period section lists the dates on which it differs.
Ten more examples
Awkward minutes from IST to WET
01:05 IST corresponds to 19:35 WET (previous day). 03:20 IST corresponds to 21:50 WET (previous day). 05:50 IST corresponds to 00:20 WET. 07:35 IST corresponds to 02:05 WET. 10:10 IST corresponds to 04:40 WET. 13:25 IST corresponds to 07:55 WET. 16:40 IST corresponds to 11:10 WET. 19:55 IST corresponds to 14:25 WET. 22:15 IST corresponds to 16:45 WET. 23:05 IST corresponds to 17:35 WET.
Checking your work
Compare your own answer with the pattern in these rows. Because of the half hour, the minute figure always shifts by thirty; expect :15 to become :45 and :45 to become :15. These rows use the standard (winter) gap; on the dates listed in the period section the gap is different.
Daily rhythm at the other end
WET time of day for chosen IST hours
06:00 IST corresponds to 00:30 WET (night). 08:00 IST corresponds to 02:30 WET (night). 10:00 IST corresponds to 04:30 WET (night). 12:00 IST corresponds to 06:30 WET (early morning). 14:00 IST corresponds to 08:30 WET (morning). 16:00 IST corresponds to 10:30 WET (morning). 18:00 IST corresponds to 12:30 WET (around midday). 20:00 IST corresponds to 14:30 WET (afternoon). 22:00 IST corresponds to 16:30 WET (afternoon).
Using the brackets
The brackets show whether the WET hour falls at night, in the early morning, during the working day or in the evening, which helps when you must convert IST to WET for a call. These rows use the standard (winter) gap; on the dates listed in the period section the gap is different.
Checklist: how to convert IST to WET
Preparation
Confirm the zones
Indian Standard Time is UTC+5:30; the same three letters are used for Israel and for Ireland’s summer clock, which this page does not cover. WET is used by mainland Portugal, Madeira, the Canary Islands and the Faroe Islands; the Azores are an hour behind.
Use a 24-hour clock
Write 4:30 p.m. as 16:30 and 12:00 a.m. as 00:00 before you start. For example, 09:15 IST becomes 03:45 WET.
After the sum
The operation
Subtract 5 hours 30 minutes. If the result passes midnight, correct the date: readings before 05:30 fall on the previous date.
A second example
Try a later hour: 22:40 IST is 17:10 WET.
Common slips when you convert IST to WET
Adding instead of subtracting
Because WET runs behind IST, the result must be an earlier clock reading. A later one points to an addition.
Losing the date
A IST time before 05:30 moves to the previous date. Keeping the original date produces a one-day error.
The standard figure in the wrong weeks
On some dates in 2026 the distance between IST and WET differs from the usual one, so read the period list before you apply it.
Confusing the abbreviation
IST here is always India (UTC+5:30), never Ireland’s summer time or Israel’s standard time. Mainland Portugal, Madeira and the Canaries use WET; Britain and Ireland have the same offset but call it GMT in winter.
Frequently asked questions
By how much do IST and WET differ?
5 hours 30 minutes, and WET is behind IST. That is the standard figure; on some dates in 2026 it differs, as the period list shows.
Which sum applies when I convert IST to WET?
Subtract 5 hours 30 minutes from the IST time, then fix the date if the result passes midnight.
What does 21:45 IST become in WET?
16:15 WET 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. The calculation runs in your browser.
Other pairs worth a look
See also Convert IST to EET, Convert IST to CST, Convert UTC to WET, Convert PST to WET, Convert WET to GMT, Convert GMT to IST, Convert WET to UTC, Convert CST to IST, Convert IST to CET. The opposite direction is Convert WET to IST.
To sum up: convert IST to WET by one rule (subtract 5 hours 30 minutes) and a glance at the calendar. The work is done on your device.