Convert PST to IST Pacific Standard Time ↔ India Standard Time Free Online Secure
Type a time in PST and read it in IST straight away. The offset is +13:30 h, the arithmetic wraps at midnight, and the answer says which day it lands on.
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Through the day — Convert PST to IST (Pacific Standard Time ↔ India Standard Time)
| PST | IST |
|---|---|
| 00:00 | 13:30 |
| 03:00 | 16:30 |
| 06:00 | 19:30 |
| 09:00 | 22:30 |
| 12:00 | 01:30 |
| 15:00 | 04:30 |
| 18:00 | 07:30 |
| 21:00 | 10:30 |
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.
A venture fund on Sand Hill Road and a start-up in Bangalore
A venture fund in Menlo Park sets a call with the founders of a Bangalore start-up for 9:00 a.m. PT. A course at a Californian university begins at 8:00 a.m. PT. A wedding ceremony in the Bay Area is streamed for relatives in India. In every case the Indian side has to convert PST to IST. On standard time the rule is quick to state: add thirteen and a half hours. 9:00 a.m. PST becomes 22:30 IST, 8:00 a.m. PST becomes 21:30 IST, and 2:00 p.m. PST becomes 03:30 IST the next day. India does not move its clocks, so the answer changes only when California goes onto summer time: from 8 March to 31 October the difference is one hour smaller, at twelve and a half hours.
Below are the rule, the tables and a description of the zones, followed by episodes from venture capital, universities, film co-productions, research, work visas and travel. The calculation takes place in your browser, and no figure is sent to a server.
Calls with venture investors
Morning time in the west
Meetings with Silicon Valley funds are usually held in the morning, at 9:00 or 10:00 PT. For founders in India that means 22:30 or 23:30 IST in winter and an hour earlier in summer. A serious start-up prepares its pitch in the afternoon and gives it at night.
Signing time
A contract due at “the end of the day” in California, which is 5:00 p.m. PST, expires at 06:30 IST the next morning. Whoever does not convert PST to IST with the date in view risks signing a day behind.
Californian university courses followed from India
Morning lectures
A lecture at 8:00 a.m. PT is at 21:30 IST in winter. Indian students taking the course remotely follow it in the evening, after their usual hours.
Online examinations
An exam scheduled from 9:00 to 11:00 a.m. PST is held between 22:30 and 00:30 IST. Anyone who does a “convert PST to IST” calculation knows that the second half of the exam runs past midnight.
Film co-productions between Los Angeles and Mumbai
The editing session
Teams in Los Angeles and Mumbai meet online at 8:00 a.m. PST, which is 21:30 IST. The Californian editors have only just reached the office, while the Indian ones have finished a long day.
The simultaneous release
A worldwide release scheduled for 6:00 p.m. PST is at 07:30 IST the next morning. Indian distributors announce the title at breakfast.
Joint research: laboratories in Pasadena and in India
Press conferences
A conference at the propulsion laboratory in Pasadena announced for 10:00 a.m. PST takes place at 23:30 IST. Indian teams collaborating on joint missions follow the broadcast late in the evening.
Communication windows
Windows for communicating with probes are calculated in universal time, not local time. A UTC hour of 18:00 is 10:00 PST and 23:30 IST; a “convert PST to IST” calculation on these hours avoids a day’s confusion.
Work visas and filing deadlines
The registration window
A portal that closes at 12:00 noon PT closes at 01:30 IST the next day. Candidates in India who file at the last moment should know that the American day ends at 13:30 IST.
Consulate appointments
An appointment given in Californian time, at 10:15 a.m. PST, means 23:45 IST. A “convert PST to IST” calculation always shows whether it falls on the day before or the day after.
Weddings streamed between continents
The afternoon ceremony
A ceremony in California at 4:00 p.m. PST begins at 05:30 IST the next morning. Relatives in India get up at dawn to watch it live.
The feast and the party
The wedding feast at 7:00 p.m. PST is at 08:30 IST the next morning. For relatives in India it is a festive breakfast, for the guests in California dinner.
Product presentations from Silicon Valley
The ten o’clock hour
Big presentations often begin at 10:00 a.m. PT, which is 23:30 IST in winter. Whoever follows them from India arrives at the end of the evening.
Pre-orders
Orders open at 5:00 a.m. PST, which is 18:30 IST. Anyone who does a “convert PST to IST” calculation knows when to go to the site.
How to convert PST to IST
The thirteen-and-a-half-hour rule
The Pacific in winter sits at UTC−8 and India at UTC+5:30. The two clocks are 13 hours 30 minutes apart, with India ahead. Take the Californian time on a 24-hour clock and add 13:30; if the sum passes 24:00, subtract 24 and move the date forward. Any Californian time from 10:30 onward falls on the following day in India.
Eight values to check
02:00 PST is 15:30 IST. 05:30 PST is 19:00 IST. 08:15 PST is 21:45 IST. 10:30 PST is 00:00 IST the next day. 12:00 PST is 01:30 IST the next day. 15:00 PST is 04:30 IST the next day. 19:30 PST is 09:00 IST the next day. 23:45 PST is 13:15 IST the next day. The last five roll over to the next day.
When the figure changes
With PDT, California’s summer time, the gap to India falls to twelve and a half hours: 10:00 a.m. PDT is 22:30 IST. It is America that changes, not India. Between 8 March and 31 October, a result obtained with the winter figure has to be corrected by an hour.
India’s clock
From Gujarat to Assam
Across the whole country clocks read the same: UTC+5:30, with no move to summer time in any month. The half hour at the end of the gap changes the minutes of the result: 9:15 a.m. PST becomes 22:45 IST.
The neighbours
Sri Lanka keeps the same time as India. Nepal has UTC+5:45, Pakistan UTC+5 and Bangladesh UTC+6.
Pacific time
Where it applies
UTC−8 is the winter clock of California, Oregon, Washington, nearly all of Nevada and British Columbia. In spring the clock rises to UTC−7 under the name PDT. Americans write “PT”.
Who sets its pace
The Hollywood studios, the Silicon Valley firms, the Pasadena laboratories and the western ports fix their schedules on this clock. An Indian reader who follows them often has to convert PST to IST.
Thirteen and a half hours between the clocks
The office schedule
A Californian office open from 09:00 to 17:00 is open from 22:30 to 06:30 on Indian time. An Indian office open from 09:00 to 17:00 is open from 19:30 to 03:30 on the Pacific clock of the previous day. The two days touch nowhere.
Who calls and when
A call from California at 7:00 a.m. PST reaches India at 20:30. One at 2:00 p.m. PST reaches 03:30 IST, in the dead of night. That is why calls are made in the first part of the Californian morning.
Half the globe by air
A flight from San Francisco to Bangalore with one stop that leaves at 22:00 PST and takes nearly twenty-one hours lands at 08:30 IST, two calendar days later. The ticket shows 22:00 and 08:30, as for a trip of thirty-four and a half hours.
The Nasdaq in the Indian evening
The opening
In winter the Nasdaq opens at 9:30 a.m. ET, which is 6:30 a.m. PST or 20:00 IST, and closes at 4:00 p.m. ET, which is 02:30 IST the next day. An investor in India spends the evening at the screen.
The results
A Californian company that reports at 1:05 p.m. PT reports at 02:35 IST the next day. Indian analysts read the figures in the morning.
Shopping at the Californian midnight
Summer sales
The big summer deals begin at 12:01 a.m. PT, which is 12:31 IST. Indian shoppers find them at lunchtime.
Black Friday
The discounts after Thanksgiving begin at 12:00 a.m. PST, which is 13:30 IST. A “convert PST to IST” calculation shows at once that the Californian offers open in the early Indian afternoon.
The same Californian hour, four moments of the year
Winter
On Friday 9 January, 09:00 PST reads 22:30 IST. The usual difference of thirteen and a half hours applies.
The end of February
On Friday 27 February, 09:00 PST is still 22:30 IST. California has not yet changed its clock.
After the change
On Friday 13 March, 09:00 PDT reads 21:30 IST. Californians moved their clocks on 8 March and Indians did not, so the difference has shrunk to twelve and a half hours.
Summer and autumn
On Friday 14 August, 09:00 PDT is 21:30 IST. On Friday 13 November, 09:00 PST is again 22:30 IST, after California’s return to standard time on 1 November.
Earthquake alerts and bad weather in California
Emergency bulletins
Emergency-service bulletins carry the local time of the west coast. One issued at 8:00 a.m. PT appears at 21:30 IST in winter. One at 5:00 p.m. PT appears at 06:30 IST the next day.
Relatives in India
Families in India who follow events do a “convert PST to IST” calculation for each bulletin and learn whether the message appeared before or after their relatives in California went to bed.
Flights between California and India
The evening departure
A flight from Los Angeles to Delhi with one stop that leaves at 23:00 PST and takes twenty hours lands at 19:00 PST, which is 08:30 IST, two days after departure by the Indian clock. Passengers arrive in the morning.
The return
A flight from Delhi that leaves at 02:00 IST and takes nearly twenty hours lands at 22:00 IST, which is 8:30 a.m. PST. A “convert PST to IST” calculation shows that the departure at 02:00 IST was, in California, at 12:30 p.m. PST the previous day.
Asian clocks, read from the Californian dial
A reference table
When it is 9:00 a.m. in Los Angeles in winter, it is 22:30 in Delhi, 23:00 in Dhaka, 01:00 in Singapore and 02:00 the next day in Tokyo. On Californian summer time, each of these hours is one hour earlier.
Why it changes
Asia does not change its clocks. Only California’s gap grows or shrinks. An invitation with all the hours beside it spares the reader a “convert PST to IST” calculation of their own.
Deadlines and money sent across the ocean
The bank counter
A transfer that has to be sent “by 4:00 p.m.” Pacific time must be sent, on Indian time, before 05:30 the next day. An Indian reader who counts the deadline by their own clock risks a day’s delay.
Deadlines
A deadline of 11:59 p.m. PST falls at 13:29 IST the next day. Whoever thinks they have until midnight on their own clock actually has almost fourteen hours more.
How the clock changes affect this pair
The year in segments
The difference between PST and IST depends on the date. In 2026: 1 January to 7 March and 1 November to 31 December: IST stands 13 hours 30 minutes ahead of PST; 8 to 28 March, 29 March to 24 October and 25 to 31 October: IST stands 12 hours 30 minutes ahead of PST.
What to do about it
During the summer periods the zones are called PDT and IST. The calculator assumes the winter gap of 13 hours 30 minutes; adjust by the difference shown for your date. To convert PST to IST correctly, start by locating your date in this list.
The full day, hour by hour
PST hours and their IST equivalents
00:00 PST becomes 13:30 IST. 01:00 PST becomes 14:30 IST. 02:00 PST becomes 15:30 IST. 03:00 PST becomes 16:30 IST. 04:00 PST becomes 17:30 IST. 05:00 PST becomes 18:30 IST. 06:00 PST becomes 19:30 IST. 07:00 PST becomes 20:30 IST. 08:00 PST becomes 21:30 IST. 09:00 PST becomes 22:30 IST. 10:00 PST becomes 23:30 IST. 11:00 PST becomes 00:30 IST (next day). 12:00 PST becomes 01:30 IST (next day). 13:00 PST becomes 02:30 IST (next day). 14:00 PST becomes 03:30 IST (next day). 15:00 PST becomes 04:30 IST (next day). 16:00 PST becomes 05:30 IST (next day). 17:00 PST becomes 06:30 IST (next day). 18:00 PST becomes 07:30 IST (next day). 19:00 PST becomes 08:30 IST (next day). 20:00 PST becomes 09:30 IST (next day). 21:00 PST becomes 10:30 IST (next day). 22:00 PST becomes 11:30 IST (next day). 23:00 PST becomes 12:30 IST (next day).
Reading the rows
Every line gives a PST time and the IST time at the same instant, with a note wherever the date moves. It is the quickest check when you convert PST to IST. The half-hour in the offset moves each minute reading by thirty, which is why this pair needs a second look. Read these rows as standard-time values and check the period section for dates where the difference changes.
Half-hour marks
PST to IST at :30
00:30 PST becomes 14:00 IST. 01:30 PST becomes 15:00 IST. 02:30 PST becomes 16:00 IST. 03:30 PST becomes 17:00 IST. 04:30 PST becomes 18:00 IST. 05:30 PST becomes 19:00 IST. 06:30 PST becomes 20:00 IST. 07:30 PST becomes 21:00 IST. 08:30 PST becomes 22:00 IST. 09:30 PST becomes 23:00 IST. 10:30 PST becomes 00:00 IST (next day). 11:30 PST becomes 01:00 IST (next day). 12:30 PST becomes 02:00 IST (next day). 13:30 PST becomes 03:00 IST (next day). 14:30 PST becomes 04:00 IST (next day). 15:30 PST becomes 05:00 IST (next day). 16:30 PST becomes 06:00 IST (next day). 17:30 PST becomes 07:00 IST (next day). 18:30 PST becomes 08:00 IST (next day). 19:30 PST becomes 09:00 IST (next day). 20:30 PST becomes 10:00 IST (next day). 21:30 PST becomes 11:00 IST (next day). 22:30 PST becomes 12:00 IST (next day). 23:30 PST becomes 13:00 IST (next day).
Why it helps
Many meetings, broadcasts and scheduled jobs start at half past the hour. This table gives the IST time for each of them at a glance, which saves you a second calculation. The gap used here is the standard winter one; the period section lists the dates on which it differs.
Not just whole hours
Ten PST readings and the IST result
01:05 PST becomes 14:35 IST. 03:20 PST becomes 16:50 IST. 05:50 PST becomes 19:20 IST. 07:35 PST becomes 21:05 IST. 10:10 PST becomes 23:40 IST. 13:25 PST becomes 02:55 IST (next day). 16:40 PST becomes 06:10 IST (next day). 19:55 PST becomes 09:25 IST (next day). 22:15 PST becomes 11:45 IST (next day). 23:05 PST becomes 12:35 IST (next day).
A word on minutes
A request to convert PST to IST often involves times such as 07:05 or 22:15, so the list below shows ten of them. 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
IST time of day for chosen PST hours
06:00 PST becomes 19:30 IST (evening). 08:00 PST becomes 21:30 IST (evening). 10:00 PST becomes 23:30 IST (night). 12:00 PST becomes 01:30 IST (night). 14:00 PST becomes 03:30 IST (night). 16:00 PST becomes 05:30 IST (early morning). 18:00 PST becomes 07:30 IST (early morning). 20:00 PST becomes 09:30 IST (morning). 22:00 PST becomes 11:30 IST (morning).
Using the brackets
The brackets show whether the IST hour falls at night, in the early morning, during the working day or in the evening, which helps when you must convert PST to IST for a call. These rows use the standard (winter) gap; on the dates listed in the period section the gap is different.
Before you convert PST to IST: a short checklist
First
Confirm the zones
Do not confuse PST with Philippine or Pakistan time; this converter means the Pacific coast of North America. 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.
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 PST becomes 22:45 IST.
Then
The operation
Add 13 hours 30 minutes. If the result passes midnight, correct the date: readings from 10:30 fall on the next date.
A second example
Try a later hour: 22:40 PST is 12:10 IST (next day).
Common slips when you convert PST to IST
Subtracting instead of adding
Because IST runs ahead of PST, the result must be a later clock reading. An earlier one points to a subtraction.
Losing the date
A PST time from 10:30 moves to the next date. Keeping the original date produces a one-day error.
The standard figure in the wrong weeks
Do not assume that PST and IST are always the same distance apart; the period list above shows the exceptions.
Confusing the abbreviation
On this page PST means the west coast of North America at UTC−8, and nothing else. IST can also mean Irish Standard Time or Israel Standard Time; here it means India.
Questions and answers
What is the difference between PST and IST?
13 hours 30 minutes, and IST is ahead of PST. That is the standard figure; on some dates in 2026 it differs, as the period list shows.
What do I do to convert PST to IST?
Add 13 hours 30 minutes to the PST time, then fix the date if the result passes midnight.
What does 21:45 PST become in IST?
11:15 IST on the next day in the standard period.
Does the answer change during the year?
Yes, on some dates; the period list above shows which.
Is the time I enter sent anywhere?
No. Everything happens on your own device.
Related conversions
You may also want Convert PST to GMT, Convert PST to EST, Convert UTC to IST, Convert WET to IST, Convert IST to UTC, Convert EST to PST, Convert PST to EET, Convert EET to CST, Convert PST to CST. To go the other way, use Convert IST to PST.
The short version: add 13 hours 30 minutes, check the date, and you can convert PST to IST with confidence. No account is needed.