1 PM PST to IST

Sundial Shadow Converter

Common Pacific Call Times

One-click presets for the most-searched Pacific meeting slots.

PST → IST Hour-by-Hour Table

Need the reverse? Go from IST to PST instead.

The Offset Formula

What 1 PM PST Really Means in India

Zone Reference

Offsets per the IANA tz database. India anchored to the 82.5° E meridian; US DST per the Energy Policy Act 2005.

No saved conversions yet. Tap "Save to History" to remember up to six PST → IST lookups.

How to Convert 1 PM PST to IST with the Sundial

1. Set the Pacific time — type it into the time field, or accept the default 1:00 PM to see the headline answer.
2. Pick the Pacific mode: PST (UTC-8) for November–March or PDT (UTC-7) for March–November per the Energy Policy Act 2005 schedule.
3. Watch the gnomon shadow swing — the higher the California sun, the more the shadow points into the India night band, and the readout plate shows the exact IST time with a "next day" flag.
4. Read the verdict band: green means India business hours, amber means a workable edge, red means India is asleep (which is what 1 PM Pacific always is).
5. Save the snapshot to compare call windows, or tap a preset chip for the most common Pacific meeting slots.

Why This Converter Exists

In 2026, a solutions architect in Cupertino keeps trying to slot a 1 PM Pacific design review with a backend squad in Hyderabad, and keeps forgetting that 1 PM PST is the dead of night in India. That single recurring mistake — booking a comfortable Californian early afternoon that turns out to be 2:30 AM for the people who actually have to join — is exactly what this sundial converter is built to expose at a glance. India Standard Time (IST) sits at a flat UTC+5:30 and observes no daylight saving, so the only moving part is whether California is on Pacific Standard Time (PST, UTC-8) or Pacific Daylight Time (PDT, UTC-7).

The half-hour that trips up newcomers comes from India's history. India Standard Time was standardised in 1906 and anchored to the 82.5° E meridian that runs through Mirzapur near Allahabad, a single national compromise between the older Bombay Time and Calcutta Time of the British Raj. Because the offset is +5:30 rather than a whole number of hours, every PST-to-IST conversion lands on a half-hour boundary: 1:00 PM PST becomes 2:30 AM IST the next day under PST and 1:30 AM IST the next day under PDT.

Pacific Time is the side that actually swings. Under the US Energy Policy Act of 2005, daylight saving begins on the second Sunday of March and ends on the first Sunday of November. From March to November California runs on PDT (UTC-7); the rest of the year it runs on PST (UTC-8). That one hour is why 1 PM Pacific is 2:30 AM IST in winter but 1:30 AM IST in summer — the India clock never moves, so the whole shift comes from the Pacific side, which is precisely why the sundial below lets you toggle PST and PDT manually.

The IANA time zone database, the tz database maintained by Paul Eggert and contributors, encodes Pacific Time as America/Los_Angeles and India as Asia/Kolkata. Asia/Kolkata has carried a flat +05:30 rule since 1945 with zero daylight-saving transitions, which is why software that relies on the IANA rules never special-cases India. America/Los_Angeles carries the full US DST ruleset, so a correct converter must either know today's date or let you pick the mode — the sundial does the latter.

GMT and UTC get used interchangeably in scheduling apps, but they are not the same thing: GMT is a time zone equal to UTC+0 on the Greenwich meridian, while UTC is the atomic standard the world's clocks are disciplined to. The cleanest mental model for this page is to convert through UTC. 1 PM PST is UTC-8, so UTC = 13:00 + 8:00 = 21:00; IST is UTC+5:30, so 21:00 + 5:30 = 02:30 the next day. The gap is a fixed 13 hours 30 minutes in winter and 12 hours 30 minutes in summer.

The practical reason this exact page exists is the unforgiving call window. A 1 PM Pacific meeting is mid-afternoon for California but lands in the small hours for India — far too late for anyone but an emergency bridge or an async handoff. The gnomon sundial makes that obvious: the California sun is high overhead while the shadow it casts points straight into the India night band, with a verdict that flatly tells you nobody in Hyderabad, Bengaluru, or Pune should be expected to take a synchronous call at 2:30 AM.

Distributed US–India teams have lived with this constraint since the offshore-IT boom of the late 1990s, when Infosys, Wipro, and TCS built delivery centres timed to overlap with US clients. The humane overlap between California and India is famously narrow — roughly 8:00 AM to 10:30 AM Pacific maps to a tolerable 8:30 PM to 11:00 PM India evening on PDT. A 1 PM Pacific slot sits well outside that band, and the sundial turns that institutional knowledge into a single shareable picture for any hour you care to test.