The short answer: India Standard Time (IST, UTC+5:30) is 13.5 hours ahead of US Pacific Standard Time (PST), and 12.5 hours ahead of Pacific Daylight Time (PDT) in US summer. So 9:00 AM PST = 10:30 PM IST (and 9:00 AM PDT = 9:30 PM IST). The only realistic shared window is your early morning, which is India's evening.
The US West Coast and India sit almost exactly half a world apart, so there is no hour that is daytime in both places. The same wide offset that rules out daytime-to-daytime calls makes your morning to India's evening the one comfortable window worth knowing.
How far ahead is IST of PST?
India keeps a single time zone, India Standard Time, at UTC+5:30, and it never changes for daylight saving. The US West Coast does, switching between PST (UTC−8) in winter and PDT (UTC−7) in summer. That makes the gap season-dependent.
| US Pacific clock | UTC offset | IST is ahead by |
|---|---|---|
| PST (US winter) | UTC−8 | 13.5 hours |
| PDT (US summer) | UTC−7 | 12.5 hours |
India observes neither change, so the only thing moving is the US clock. When the West Coast springs forward in March, the gap shrinks by an hour; when it falls back in November, the gap widens again.
PST to IST: worked conversions
Add 13.5 hours to a PST time to get IST (and roll the date forward where it crosses midnight). For US summer, add 12.5 hours to PDT instead. The table below uses winter PST.
| Time in PST | Time in IST | Time in IST (summer, PDT) |
|---|---|---|
| 9:00 AM | 10:30 PM | 9:30 PM |
| 12:00 PM | 1:30 AM (next day) | 12:30 AM (next day) |
| 5:00 PM | 6:30 AM (next day) | 5:30 AM (next day) |
| 7:00 AM | 8:30 PM | 7:30 PM |
The pattern is clear: a normal Pacific workday lands in India's late evening and overnight. The one reliable overlap is your early morning against India's evening, around the end of the Indian working day.
India never changes its clocks, but US Pacific springs forward in March and falls back in November, so the gap moves between 13.5 and 12.5 hours. A recurring call set in winter will land an hour off in summer unless you adjust it. See what PST is and what IST is.
Stop converting this by hand
If you work with India from the US West Coast regularly, this arithmetic gets old fast, and the 13.5-versus-12.5-hour swing is exactly where daylight-saving mistakes creep in. Atlas keeps Pacific time and India side by side in your Mac menu bar, shades the hours when both sides are awake, and writes any meeting to your calendar in both local times. One glance tells you the conversion.
Frequently asked
How many hours ahead is IST of PST?
What is 9 AM PST in IST?
Does India observe daylight saving time?
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