SwiftCalcTools

Time Zone Converter — World Time Zone Tool

Convert time between different time zones worldwide. Find current time in any city or country and schedule meetings across time zones.

📅 Date & Time ✅ Free

By SwiftCalcTools Editorial Team · Formula verified

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Preparing your calculator

How to Use Time Zone Converter

  1. 1Enter the required values in the input fields above.
  2. 2Click the Calculate button or results update instantly as you type.
  3. 3View your results in the output panel below the inputs.
  4. 4Adjust any values to recalculate instantly.

Frequently Asked Questions

IST (Indian Standard Time) is UTC+5:30 — five and a half hours ahead of UTC. India does not observe Daylight Saving Time (DST), so the offset is constant year-round. This means when it's 12:00 UTC, it's 17:30 IST. IST is 10.5 hours ahead of US Pacific Time (standard) and 13.5 hours ahead of PST during US daylight saving.
USA observes DST (clocks spring forward 1 hour in March, fall back in November). UK/Europe also observe BST/CEST in summer. India, UAE (GST), Singapore (SGT), and Japan (JST) do NOT observe DST. This means the offset between IST and New York varies: IST+10.5h in US summer (EDT), IST+11.5h in US winter (EST).
For practical purposes, GMT and UTC are the same (both are the 0° meridian reference). Technically: GMT is a time zone (based on the mean solar time at the Royal Observatory, Greenwich). UTC is a time standard (based on atomic clocks). The difference is never more than 0.9 seconds. The UK observes GMT in winter and BST (UTC+1) in summer.
IST is 10.5h ahead of EDT (US Eastern summer) and 11.5h ahead of EST (US Eastern winter). For overlap: IST 6:30 PM–8:30 PM = New York 8 AM–10 AM (EDT). IST 8 PM–10 PM = Los Angeles 7:30 AM–9:30 AM (PDT). For India-UK: IST 1:30 PM–5:30 PM = London 8 AM–12 PM (BST in summer).