Convert IST to PST
To convert IST to PST: 10:00 AM IST is 8:30 PM PST the previous day. IST is UTC+05:30 and PST is UTC-08:00, so PST is 13 hours 30 minutes behind IST, but not all year, as explained below.
In Pacific Standard Time
- 10:00 AM IST
- 8:30 PM PST (previous day)
- On a 24-hour clock
- 10:00 IST is 20:30 PST
- The offsets
- IST is UTC+05:30, PST is UTC-08:00
- Difference
- PST is 13 hours 30 minutes behind IST
- Date
- The previous day. Going back 13 hours 30 minutes crosses midnight from this time.
- This gap does NOT hold all year Convert through the offset in force on the date you care about.
- The two ends switch on different dates, or one does not switch at all.
- PST is only in force part of the year United States: daylight time starts the second Sunday in March, at 02:00 local time and ends the first Sunday in November, at 02:00 local time (Energy Policy Act of 2005, in force since 2007). In 2026 that is 2026-03-08 to 2026-11-01. Los Angeles is on PDT between those dates.
- otherwise PDT, UTC-07:00
- Military time zone letters Z (Zulu) is UTC. A to M run east of Greenwich an hour apart, N to Y west, and J is left out. A letter names an offset, so a zone that switches to daylight time changes letter: EST is R, EDT is Q.
- IST is E* (Echo, starred: off the whole hour), PST is U (Uniform)
- In every zone
- HST 18:30 AKST 19:30 PST 20:30 AKDT 20:30 MST 21:30 PDT 21:30 CST 22:30 MDT 22:30 EST 23:30 CDT 23:30 EDT 00:30 UTC 04:30 GMT 04:30 BST 05:30 CET 05:30 CEST 06:30 EET 06:30 EEST 07:30 MSK 07:30 IST 10:00 SGT 12:30 HKT 12:30 JST 13:30 AEST 14:30 AEDT 15:30 NZST 16:30 NZDT 17:30
How the Time Zone Converter works
India Standard Time (IST) is UTC+05:30 and Pacific Standard Time (PST) is UTC-08:00, so converting IST to PST means subtracting 13 hours 30 minutes from the IST time. PST is 13 hours 30 minutes behind IST.
Worked through: 10:00 AM IST is 8:30 PM PST the previous day. Note the date: this pair crosses midnight for much of the day, so the answer is often a different day as well as a different time. The day is the part a conversion done in your head tends to drop.
The gap between these two is not the same all year, which is the thing to get right. IST never shifts and PST does, so the difference moves. Convert through the offset in force on the date you care about rather than through the abbreviation somebody typed; the offsets above are definitions and the abbreviation is a claim about the calendar.
Twelve and a half to thirteen and a half hours back, and the direction that reliably lands on the previous day: a 10:00 morning in Delhi is 20:30 the evening before in Los Angeles. For teams working this pair, the only shared waking hours are the Indian early morning against the California late evening, or the Indian late evening against the California early morning. Which of those is worse is the recurring argument.
One thing worth stating plainly, because it is the most common mistake in this whole subject: an abbreviation is not a place. IST is fixed, so it is the same all year. PST is likewise only in force for part of the year in Los Angeles; otherwise it is PDT at UTC-07:00. If what you have is a city and a date rather than a pair of abbreviations, that is a different question and needs the tz database, not arithmetic. This is also why the shifting designations exist: PT means Pacific time whichever of the two is in force. Searching for PT and searching for IST to PST are the same question in two vocabularies, which is why this converter answers both.
Common times for this pair:
- 9:30 AM IST is 8:00 PM PST the previous day - 10:00 AM IST is 8:30 PM PST the previous day - 6:00 PM IST is 4:30 AM PST - 9:00 PM IST is 7:30 AM PST
Time Zone Converter FAQ
What is the time difference between IST and PST?
PST is 13 hours 30 minutes behind IST. IST is UTC+05:30 and PST is UTC-08:00, and both offsets are definitions rather than measurements, so the subtraction is exact.
What time is 10:00 AM IST in PST?
10:00 AM IST is 8:30 PM PST the previous day. Subtract 13 hours 30 minutes and carry the date if it crosses midnight.
Does the difference between IST and PST change with daylight saving?
Yes, and this is the main thing to watch on this pair. IST is fixed and PST shifts by an hour for part of the year, so the difference takes more than one value across the year. In 2026 the United States switch runs from 2026-03-08 to 2026-11-01.
Is there anything specific to this pair worth knowing?
Twelve and a half to thirteen and a half hours back, and the direction that reliably lands on the previous day: a 10:00 morning in Delhi is 20:30 the evening before in Los Angeles. For teams working this pair, the only shared waking hours are the Indian early morning against the California late evening, or the Indian late evening against the California early morning. Which of those is worse is the recurring argument.
Someone wrote PST but it is summer. What do they mean?
Almost certainly the zone rather than the abbreviation: Los Angeles time, which in summer is PDT at UTC-07:00 rather than PST at UTC-08:00. People type the standard-time abbreviation all year round. If an invitation is an hour out from what you calculated, this is why.