IST to PST converter
Pacific Time is 13 hours 30 minutes behind India Standard Time in winter (PST, UTC−8) and 12 hours 30 minutes behind in summer (PDT, UTC−7). To convert IST to PST, subtract 13 hours 30 minutes during standard time and 12 hours 30 minutes during daylight saving time.
India Standard Time runs at UTC+5:30, Pacific Time at UTC−8 / UTC−7.
IST to PST conversion table
Every hour of the day converted for both halves of the year. The two columns differ because Pacific Time changes its offset for daylight saving time.
| India Standard Time (IST) | PST (Nov–Mar) | PDT (Mar–Nov) |
|---|---|---|
| 00:00 12:00 AM | 10:30 10:30 AM previous day | 11:30 11:30 AM previous day |
| 01:00 1:00 AM | 11:30 11:30 AM previous day | 12:30 12:30 PM previous day |
| 02:00 2:00 AM | 12:30 12:30 PM previous day | 13:30 1:30 PM previous day |
| 03:00 3:00 AM | 13:30 1:30 PM previous day | 14:30 2:30 PM previous day |
| 04:00 4:00 AM | 14:30 2:30 PM previous day | 15:30 3:30 PM previous day |
| 05:00 5:00 AM | 15:30 3:30 PM previous day | 16:30 4:30 PM previous day |
| 06:00 6:00 AM | 16:30 4:30 PM previous day | 17:30 5:30 PM previous day |
| 07:00 7:00 AM | 17:30 5:30 PM previous day | 18:30 6:30 PM previous day |
| 08:00 8:00 AM | 18:30 6:30 PM previous day | 19:30 7:30 PM previous day |
| 09:00 9:00 AM | 19:30 7:30 PM previous day | 20:30 8:30 PM previous day |
| 10:00 10:00 AM | 20:30 8:30 PM previous day | 21:30 9:30 PM previous day |
| 11:00 11:00 AM | 21:30 9:30 PM previous day | 22:30 10:30 PM previous day |
| 12:00 12:00 PM | 22:30 10:30 PM previous day | 23:30 11:30 PM previous day |
| 13:00 1:00 PM | 23:30 11:30 PM previous day | 00:30 12:30 AM |
| 14:00 2:00 PM | 00:30 12:30 AM | 01:30 1:30 AM |
| 15:00 3:00 PM | 01:30 1:30 AM | 02:30 2:30 AM |
| 16:00 4:00 PM | 02:30 2:30 AM | 03:30 3:30 AM |
| 17:00 5:00 PM | 03:30 3:30 AM | 04:30 4:30 AM |
| 18:00 6:00 PM | 04:30 4:30 AM | 05:30 5:30 AM |
| 19:00 7:00 PM | 05:30 5:30 AM | 06:30 6:30 AM |
| 20:00 8:00 PM | 06:30 6:30 AM | 07:30 7:30 AM |
| 21:00 9:00 PM | 07:30 7:30 AM | 08:30 8:30 AM |
| 22:00 10:00 PM | 08:30 8:30 AM | 09:30 9:30 AM |
| 23:00 11:00 PM | 09:30 9:30 AM | 10:30 10:30 AM |
How the IST to PST conversion works
Converting IST to PST means taking a wall-clock time in India Standard Time (IST, UTC+5:30) and expressing the same instant in Pacific Time (PST / PDT, UTC−8 / UTC−7). The arithmetic is one step: subtract 13 hours 30 minutes while Pacific Time is on standard time, and 12 hours 30 minutes while it is on daylight saving time. Applying the gap pushes part of the day onto a different calendar date — the table below marks every row that shifts. In code, store the instant in UTC and convert with the IANA identifiers Asia/Kolkata and America/Los_Angeles, never with the abbreviations. One note on the source label: IST is also used for Irish Standard Time and Israel Standard Time, so the abbreviation alone is ambiguous. On the target label: PST strictly names the winter offset, so a summer meeting written as PST is almost always PDT, an hour earlier.
Best time for meetings between IST and PST
Working hours are taken as 09:00–18:00 in each zone. The window in force depends on the date, so both halves of the year are listed where they differ.
PST (Nov–Mar)
A 9-to-6 working day in the two zones does not overlap at all. The PST working day runs from 10:30 PM to 7:30 AM the next day in IST terms, so a shared call means an early start on one side or a late finish on the other.
PDT (Mar–Nov)
A 9-to-6 working day in the two zones does not overlap at all. The PDT working day runs from 9:30 PM to 6:30 AM the next day in IST terms, so a shared call still costs one side an early morning or a late evening.
Daylight saving time: which side moves
Only Pacific Time shifts. India Standard Time holds a single offset all year, so every change in the gap comes from Pacific Time moving between PST (UTC−8) and PDT (UTC−7).
Pacific Time is 13 hours 30 minutes behind India Standard Time through the Nov–Mar window, and 12 hours 30 minutes behind through the Mar–Nov window.
US daylight saving time runs from the second Sunday in March to the first Sunday in November.
- India Standard Time
- Asia/Kolkata
- IST — UTC+5:30
- Pacific Time
- America/Los_Angeles
- PST / PDT — UTC−8 / UTC−7
Frequently asked questions
What is the time difference between IST and PST?
Pacific Time runs 13 hours 30 minutes behind India Standard Time during standard time and 12 hours 30 minutes behind during daylight saving time. In offset terms, India Standard Time sits at UTC+5:30 and Pacific Time at UTC−8 / UTC−7. So 9:00 AM IST is 7:30 PM the previous day PST, and 8:30 PM the previous day PDT once the clocks change.
Does the IST to PST difference change with daylight saving time?
The difference does change. Pacific Time moves its clocks, so the gap swings between 13 hours 30 minutes and 12 hours 30 minutes depending on the date. In the US that means clocks move forward on the second Sunday of March and back on the first Sunday of November. Convert against the IANA rules for the exact date rather than a remembered offset.
What time is 9 am IST in PST?
9:00 AM IST is 7:30 PM the previous day in Pacific Time during standard time (PST) and 8:30 PM the previous day during daylight saving time (PDT). The rule is the same one the whole page runs on: subtract 13 hours 30 minutes in winter and 12 hours 30 minutes in summer.
What do IST and PST stand for?
IST stands for India Standard Time. PST stands for Pacific Standard Time, and PDT is Pacific Daylight Time. Both are display labels rather than rules: the offsets behind them come from the IANA identifiers Asia/Kolkata and America/Los_Angeles. IST is also used for Irish Standard Time and Israel Standard Time, so the abbreviation alone is ambiguous.
Related conversions
Need more than two zones at once? The full timezone converter shows a single moment across up to six IANA timezones, for any date you choose.