PST to IST converter
India Standard Time is 13 hours 30 minutes ahead of Pacific Time while Pacific Time is on PST (UTC−8), and 12 hours 30 minutes ahead while Pacific Time is on PDT (UTC−7). To convert PST to IST, add 13 hours 30 minutes in winter and 12 hours 30 minutes in summer.
Pacific Time runs at UTC−8 / UTC−7, India Standard Time at UTC+5:30.
PST to IST 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.
| Pacific Time (PST / PDT) | IST (PST, Nov–Mar) | IST (PDT, Mar–Nov) |
|---|---|---|
| 00:00 12:00 AM | 13:30 1:30 PM | 12:30 12:30 PM |
| 01:00 1:00 AM | 14:30 2:30 PM | 13:30 1:30 PM |
| 02:00 2:00 AM | 15:30 3:30 PM | 14:30 2:30 PM |
| 03:00 3:00 AM | 16:30 4:30 PM | 15:30 3:30 PM |
| 04:00 4:00 AM | 17:30 5:30 PM | 16:30 4:30 PM |
| 05:00 5:00 AM | 18:30 6:30 PM | 17:30 5:30 PM |
| 06:00 6:00 AM | 19:30 7:30 PM | 18:30 6:30 PM |
| 07:00 7:00 AM | 20:30 8:30 PM | 19:30 7:30 PM |
| 08:00 8:00 AM | 21:30 9:30 PM | 20:30 8:30 PM |
| 09:00 9:00 AM | 22:30 10:30 PM | 21:30 9:30 PM |
| 10:00 10:00 AM | 23:30 11:30 PM | 22:30 10:30 PM |
| 11:00 11:00 AM | 00:30 12:30 AM next day | 23:30 11:30 PM |
| 12:00 12:00 PM | 01:30 1:30 AM next day | 00:30 12:30 AM next day |
| 13:00 1:00 PM | 02:30 2:30 AM next day | 01:30 1:30 AM next day |
| 14:00 2:00 PM | 03:30 3:30 AM next day | 02:30 2:30 AM next day |
| 15:00 3:00 PM | 04:30 4:30 AM next day | 03:30 3:30 AM next day |
| 16:00 4:00 PM | 05:30 5:30 AM next day | 04:30 4:30 AM next day |
| 17:00 5:00 PM | 06:30 6:30 AM next day | 05:30 5:30 AM next day |
| 18:00 6:00 PM | 07:30 7:30 AM next day | 06:30 6:30 AM next day |
| 19:00 7:00 PM | 08:30 8:30 AM next day | 07:30 7:30 AM next day |
| 20:00 8:00 PM | 09:30 9:30 AM next day | 08:30 8:30 AM next day |
| 21:00 9:00 PM | 10:30 10:30 AM next day | 09:30 9:30 AM next day |
| 22:00 10:00 PM | 11:30 11:30 AM next day | 10:30 10:30 AM next day |
| 23:00 11:00 PM | 12:30 12:30 PM next day | 11:30 11:30 AM next day |
How the PST to IST conversion works
Converting PST to IST means taking a wall-clock time in Pacific Time (PST / PDT, UTC−8 / UTC−7) and expressing the same instant in India Standard Time (IST, UTC+5:30). The arithmetic is one step: add 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 America/Los_Angeles and Asia/Kolkata, never with the abbreviations. One note on the source label: PST strictly names the winter offset, so a summer meeting written as PST is almost always PDT, an hour earlier. On the target label: IST is also used for Irish Standard Time and Israel Standard Time, so the abbreviation alone is ambiguous.
Best time for meetings between PST and IST
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.
IST (PST, Nov–Mar)
A 9-to-6 working day in the two zones does not overlap at all. The IST working day runs from 7:30 PM the previous day to 4:30 AM in PST terms, so a shared call means an early start on one side or a late finish on the other.
IST (PDT, Mar–Nov)
A 9-to-6 working day in the two zones does not overlap at all. The IST working day runs from 8:30 PM the previous day to 5:30 AM in PDT 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).
India Standard Time is 13 hours 30 minutes ahead of Pacific Time through the Nov–Mar window, and 12 hours 30 minutes ahead through the Mar–Nov window.
US daylight saving time runs from the second Sunday in March to the first Sunday in November.
- Pacific Time
- America/Los_Angeles
- PST / PDT — UTC−8 / UTC−7
- India Standard Time
- Asia/Kolkata
- IST — UTC+5:30
Frequently asked questions
What is the time difference between PST and IST?
India Standard Time runs 13 hours 30 minutes ahead of Pacific Time during standard time and 12 hours 30 minutes ahead during daylight saving time. In offset terms, Pacific Time sits at UTC−8 / UTC−7 and India Standard Time at UTC+5:30. So 9:00 AM PST is 10:30 PM IST, while 9:00 AM PDT is 9:30 PM IST.
Does the PST to IST 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 PST in IST?
9:00 AM PST is 10:30 PM IST. The same clock reading in summer is PDT, and 9:00 AM PDT is 9:30 PM IST. The rule is the same one the whole page runs on: add 13 hours 30 minutes in winter and 12 hours 30 minutes in summer. Check the hour-by-hour table for any other starting hour, including the rows that land on the previous or next calendar day.
What do PST and IST stand for?
PST stands for Pacific Standard Time, and PDT is Pacific Daylight Time. IST stands for India Standard Time. Both are display labels rather than rules: the offsets behind them come from the IANA identifiers America/Los_Angeles and Asia/Kolkata. PST strictly names the winter offset, so a summer meeting written as PST is almost always PDT, an hour earlier.
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.