🕘 IST to PST Converter

What is the IST to PST Converter?

IST and PST are not simply two points a fixed number of hours apart, because only one of the two zones moves its clocks. India Standard Time (UTC+05:30) covers the entire country from a single time zone and has not observed daylight saving since 1945, so it sits at the same offset every single day of the year. The US Pacific zone, covering cities like Los Angeles, San Francisco, Seattle and San Diego, switches between Pacific Standard Time (UTC-08:00) in winter and Pacific Daylight Time (UTC-07:00) in summer, shifting clocks forward in March and back in November. The practical effect is that the gap between the two places is 13.5 hours for about four months of the year and 12.5 hours for the remaining eight months, and the switch happens on dates set by US law, not by any rule India follows.

The date rollover is the part people get wrong most often. Because India is so far ahead of the US West Coast, a Pacific clock reading depends heavily on what time of day it is in India. Working backward from IST, any India time earlier than about 12:30 PM (during PDT) or 1:30 PM (during PST) lands on the previous calendar day once converted to Pacific Time, since subtracting a 12.5 or 13.5 hour gap from a morning or early-afternoon IST time pushes the result back past midnight. Only India evening times, roughly after 12:30 PM to 1:30 PM IST depending on the season, land on the same calendar day in California. This is the opposite pattern from conversions where the US is ahead, and it trips up people scheduling calls who assume the date never changes.

Getting the season right matters just as much. The US begins Daylight Saving Time on the second Sunday of March and ends it on the first Sunday of November, per the Energy Policy Act of 2005. A recurring meeting set up in November on Pacific Standard Time will silently need a one-hour adjustment on the India side once March arrives and the US switches to Pacific Daylight Time, even though nothing changed in India. This converter avoids that mistake by computing the actual UTC offset for America/Los_Angeles on the specific date entered, using the Intl.DateTimeFormat API built into every modern browser, which draws on the IANA Time Zone Database, the same reference dataset operating systems, phones and server software rely on worldwide.

Because IST is so far ahead of the US Pacific coast, the two working days barely overlap. A standard Indian office day, roughly 9 AM to 6 PM IST, converts to about 7:30 PM to 4:30 AM Pacific Time, meaning most of the Indian workday falls squarely in the middle of the US Pacific night. Teams that assume there is some hidden overlap, the way there often is between India and the US East Coast, are usually disappointed; the realistic compromise windows are India's evening, roughly 9 PM to 11 PM IST, against the Pacific coast's early morning, or the Pacific coast's late evening against India's early morning the next day. Recurring meetings between the two regions almost always require one side to accept an off-hours call, and many distributed teams rotate that inconvenience rather than assign it permanently to one office.

This conversion comes up constantly for anyone bridging work between India and the US West Coast: a distributed engineering team coordinating a code review call, a support shift handoff between Bangalore and San Francisco, a student registering for a live class hosted in California, or a family in India trying to reach relatives in Seattle at a reasonable hour. Because the calculation runs entirely in your browser, nothing about the date, time or purpose of your conversion is sent anywhere.

When to use it

• Scheduling a call or meeting between an India-based team and a US West Coast office without misjudging the current PST/PDT gap or the date rollover.
• Converting a webinar, live class, or product launch time listed in India Standard Time into the correct US Pacific Time for California-based attendees.
• Working out shift handoff times for support, engineering, or operations teams split between India and the US Pacific region.
• Checking whether a flight departure or arrival time, quoted in India Standard Time, lands at a reasonable hour on the US West Coast.
• Finding the best overlapping hours for daily standups or recurring meetings between an India development team and a US Pacific product team.
• Planning international calls with family or friends, converting an India evening time into the right US Pacific hour so you do not call too early or too late.

How to use the IST to PST Converter

1. Enter the date and time exactly as a clock in India (Asia/Kolkata) would show it.
2. Or click "Use current IST time" to fill in the present moment automatically.
3. Read the equivalent US Pacific Time shown below, including whether California is on PST or PDT and whether the date has shifted back a day.
4. Use the Copy button to grab the converted Pacific result for a message, calendar invite, or note.

Formula & method

Worked examples

IST to Pacific hour gap by season

Quick reference: common IST hours converted to Pacific Time (PST season, winter)

Business hours overlap: India workday versus US Pacific clock

Common mistakes to avoid

• Applying a single fixed offset all year. Treating the gap as always 13.5 hours (or always 12.5) breaks for roughly eight months of the year because Pacific Time itself changes with US daylight saving while India Standard Time never moves. Always check which side of the US DST boundary your date falls on.
• Assuming the date never changes. Because IST is so far ahead of Pacific Time, most India daytime hours convert to the previous calendar day in California, not the same day. Only India evening times, roughly after 12:30 PM to 1:30 PM IST depending on the season, land on the same date in Pacific Time.
• Confusing PST with the current Pacific offset. "PST" specifically means Pacific Standard Time (UTC-08:00, winter). If a meeting is scheduled in summer, the US West Coast side is actually on PDT (UTC-07:00), not PST, even though people casually say "PST" year-round out of habit.
• Using a rounded 12 or 14 hour offset from memory. India is often loosely remembered as "about 13 hours ahead" of the US West Coast, which ignores both the seasonal PST/PDT swing and the 30-minute IST offset. The half-hour component is a genuine feature of India Standard Time, not a rounding error.
• Expecting a normal business-hours overlap. India's 9 AM to 6 PM workday falls almost entirely within the US Pacific nighttime, roughly 7:30 PM to 4:30 AM Pacific. Teams that assume a normal 9-to-5 overlap end up scheduling calls neither side can realistically attend; the workable compromise is India evening against Pacific early morning.

Glossary

IST

India Standard Time, a single fixed offset of UTC+05:30 used across all of India with no daylight saving adjustment.

PST

Pacific Standard Time, the US Pacific zone offset of UTC-08:00 used outside the daylight saving window, roughly early November to mid-March.

PDT

Pacific Daylight Time, the US Pacific zone offset of UTC-07:00 used during the daylight saving window, roughly mid-March to early November.

Pacific Time (PT)

A generic label for the US West Coast zone that covers both PST and PDT, often used when the season is unspecified.

UTC

Coordinated Universal Time, the neutral global reference every time zone offset is measured against.

IANA time zone database

The standardized, regularly updated dataset of time zone rules and historical offsets that browsers and operating systems use to resolve zones like America/Los_Angeles correctly.

Daylight Saving Time (DST)

The seasonal practice of moving clocks forward by an hour in spring and back in autumn, observed on the US Pacific coast but not by India.

America/Los_Angeles

The IANA time zone identifier for the US Pacific zone, used by software to automatically look up the correct PST or PDT offset for any given date.

Frequently asked questions