India scheduling guide
India Time Zones
Last reviewed June 19, 2026 by TheWorldTimeMap editorial team
India uses one official civil time zone, India Standard Time, but the half-hour offset and ambiguous IST abbreviation cause many scheduling mistakes. Use this guide to plan India calls, interviews, support handoffs, and travel with clearer local-time references.
When this guide helps
Use it for India-US meetings, UK-India calls, offshore team coordination, recruiting, support coverage, and travel planning. The table gives a readable overview, while the links open live clocks, converters, and city pages for exact scheduling.
Date-sensitive caution
IST can mean India Standard Time, Irish Standard Time, or Israel Standard Time. For India, use Asia/Kolkata in calendar software and write the date clearly. For calendar invitations, include the city name, local time, and date so people and software can verify the intended offset.
Common zones and offsets
Offsets are planning references. Use the linked clock or converter with the exact date when accuracy matters.
| Zone | IANA example | Typical offset | Planning note |
|---|---|---|---|
| India Standard Time | Asia/Kolkata | UTC+5:30 | The official time used across India for business, travel, and public schedules. Open |
| UTC to IST | Etc/UTC to Asia/Kolkata | +5:30 from UTC | Useful for logs, releases, API deadlines, and global support workflows. Open |
| GMT to IST | Etc/GMT to Asia/Kolkata | +5:30 from GMT | Useful for UK-facing schedules when GMT is the published reference. Open |
| Eastern Time to IST | America/New_York to Asia/Kolkata | +10:30 / +9:30 | Useful for US East Coast and India meetings with daylight-saving cautions. Open |
| Pacific Time to IST | America/Los_Angeles to Asia/Kolkata | +13:30 / +12:30 | Useful for California and India engineering or support handoffs. Open |
Three-step planning workflow
First, pick the real anchor city for the person or team that owns the event. A broad label such as India Time Zones is useful for discovery, but calendar software needs a place-based zone such as the IANA examples in the table.
Second, test the exact calendar date and at least one future date if the meeting repeats. This catches daylight-saving gaps, half-hour offsets, regional exceptions, and cases where one side changes clocks before the other side does.
Third, write the invitation with both local times, the city names, and the date. For public pages, webinars, release notes, or customer emails, include a UTC reference only when it helps technical readers verify the same instant.
Common mistakes to avoid
Do not assume that today's offset will still be correct next month. Offsets shown on search pages, dashboards, or old email threads can become stale when daylight-saving rules, regional policies, or date boundaries change.
Do not use a short abbreviation without context. Labels such as CST, IST, BST, and GST can point to different regions, and some labels only apply in standard time or daylight time. Use the abbreviation as a reader-friendly hint, not as the source of truth.
Do not force every live call into the same region's convenient hours. If the overlap is narrow, rotate the inconvenient slot, shorten the live meeting, and move routine status work into written handoffs.
Popular city clocks
Open a city page when you need the local clock, local date, and related planning links instead of a broad regional label.
Check current India Standard Time.
UTC to ISTConvert global timestamps into India time.
IST to UTCConvert India time into UTC.
New York to India overlapPlan US East Coast and India working hours.
California to India overlapPlan US Pacific and India handoffs.
New York to India travelPlan arrival dates and first-day recovery.
Data and editorial notes
The live clock links use browser-supported IANA time zones through Intl.DateTimeFormat. The written offsets are planning references, not legal time advice, because governments and regions can change daylight-saving or standard-time rules.
Read Time Zone Data And Accuracy for data handling, Editorial Policy for review standards and advertising separation, or Feedback to report a correction.
Data accuracy explains IANA time zone sources, offset limitations, daylight-saving changes, and correction handling.
Editorial policy describes review standards and keeps regional guidance separate from advertising.
Feedback is the path for reporting stale offsets, broken city links, or unclear regional examples.
Privacy policy explains advertising, consent, analytics, cookies, and local browser storage.
India Time Zones FAQ
How many time zones does India use?
India uses one official civil time zone, India Standard Time, with the IANA zone Asia/Kolkata.
Why is IST confusing?
IST can refer to India, Ireland, or Israel depending on context. Use Asia/Kolkata when you mean India Standard Time.
Does India use daylight saving time?
India does not currently use daylight saving time, but meetings with US or European teams still shift when those regions change clocks.