There is no overlap between 09:00–18:00 working days in these two places.
How many hours is IST ahead of PST?
As abbreviations, PST is always 13.5 hours behind of IST: IST is UTC+5:30 and PST is UTC−8. To convert, subtract 13.5 hours.
Check which label you actually need: PST (Pacific Time is on PDT today). A time written with an abbreviation that is not in use is usually meant as the local time, so convert between the places instead: right now PST is 12.5 hours behind of IST.
When the IST to PST time difference changes
For most of the year PST is 12.5 hours behind of IST. From 1 November to 31 December 2026, PST is 13.5 hours behind of IST instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
Dates
PST vs IST
Length
1 November 2026 to 31 December 2026
13.5 hours behind
61 days
1 January 2027 to 13 March 2027
13.5 hours behind
72 days
14 March 2027 to 6 November 2027
12.5 hours behind
238 days
7 November 2027 to 31 December 2027
13.5 hours behind
55 days
Calling hours for IST and PST
When PST is 12.5 hours behind of IST: no shared 09:00 to 17:00 hours; try 20:00 in IST (07:30 in PST).
When PST is 13.5 hours behind of IST: no shared 09:00 to 17:00 hours; one side has to take the call outside office hours.
What time is it in Pacific Time when it’s noon in Mumbai?
India Standard Time runs 13 hours 30 minutes ahead of Pacific Standard Time. When it is noon in Mumbai, it is 10:30 PM the previous day in Los Angeles during standard time.
India Standard Time stays at UTC+5:30 all year. India does not observe daylight saving time. The US Pacific time zone switches between PST (UTC-8) in winter and PDT (UTC-7) in summer.
IST vs PST vs PDT
The conversion changes by season because the US side moves, and India does not.
On 15 January 2026, Los Angeles is 13.5 hours behind IST (PST). On 15 July 2026, Los Angeles is 12.5 hours behind IST (PDT).
IST to PST at a glance
This table uses PST (standard time). For PDT during summer, add one hour to the Pacific column.
IST
PST (previous day)
06:00
16:30
09:00
19:30
12:00
22:30
15:00
01:30 (next day)
18:00
04:30 (next day)
21:00
07:30 (next day)
When can a Los Angeles team actually meet with Bengaluru?
The practical window for a live call is narrow. India works 09:30-18:00 IST. The US West Coast typically works 08:00-17:00 local time.
During PST (winter): The overlap is roughly 22:30-02:30 PST, which is 08:30-16:30 IST the next day. That is 4 hours. Schedule calls around 08:30-09:30 IST (17:30-18:30 PST previous day) or 14:00-16:00 IST (00:30-02:30 PST).
During PDT (summer): The overlap is roughly 21:30-01:30 PDT, which is 08:30-16:30 IST the next day. Slightly better, but still a 4-hour window.
Who should do something different: If you are scheduling a recurring meeting with a team in Mumbai or Bengaluru, do not default to the same time all year. When the US switches to PDT in March, your 08:00 PST meeting becomes 08:00 PDT, which is 20:30 IST, not 21:30 IST. Adjust your calendar event to the new UTC offset, or the Indian side will show up 30 minutes early for six months.
Frequently asked questions about IST and PST time
How do I convert IST to PST in my head?
Subtract 13 hours, then subtract another 30 minutes. For example, 15:00 IST minus 13 hours = 02:00, minus 30 minutes = 01:30 PST.
Does India ever move its clocks?
No. India Standard Time is fixed at UTC+5:30 year-round. No daylight saving, no seasonal changes.
Is the conversion the same for San Francisco and Seattle?
Yes. All of California, Washington, Oregon, and Nevada observe Pacific Time. The conversion is identical for the entire US West Coast.
What about British Columbia in Canada?
Same zone. Vancouver and Victoria use Pacific Time with the same DST schedule as the US. The conversion rules above apply.
Why is the offset 13 hours 30 minutes and not a round number?
IST is based on the 82.5°E meridian, which places it at UTC+5:30. PST is UTC-8. The difference is 13 hours plus the extra 30 minutes from India’s half-hour offset.
How many hours ahead is PST of IST?
PST (UTC−8) is 13.5 hours behind of IST (UTC+5:30).
Does the time difference between IST and PST change?
Yes. It is usually 12.5 hours behind, but changes when one side moves its clocks: 13.5 hours behind from 1 November to 31 December 2026; 13.5 hours behind from 1 January to 13 March 2027.