Time Converter Explained: How to Use for Travel and Work
A time zone converter tells you what time it currently is in another city, or what a specific time in one city corresponds to in another. It's essential for scheduling international meetings, booking flights, calling family abroad, or coordinating with remote teams. This guide explains how to use one effectively and what to watch out for.
How to Use a Time Zone Converter
Step 1: Go to iFormat.io Time Zone Converter.
Step 2: Select your source city or time zone (e.g. New York).
Step 3: Select the target city (e.g. London or Mumbai).
Step 4: Enter a time — or leave it as 'now' to see the current time in both zones.
The converter shows the offset between the two zones and handles Daylight Saving Time automatically.
The Most Common Time Zone Pairs
The converter is most frequently used for these corridors:
US ↔ UK: New York (EST/EDT) and London (GMT/BST) are 5 hours apart in winter, 4 hours in summer (when both observe DST). A 9 AM New York meeting is 2 PM London in winter, 1 PM in summer.
US ↔ India: New York and India (IST) have a 10.5-hour gap in winter, 9.5 hours in summer. India doesn't observe DST, so the difference shifts every time the US changes its clocks.
US ↔ Australia: New York and Sydney are 15–16 hours apart. There's almost no overlap during normal business hours — someone always takes an early morning or late evening slot.
The Daylight Saving Time Complication
DST is the biggest source of scheduling errors. The US, UK, and Australia all change their clocks on different dates, and India and most of Asia don't change at all.
This creates 2–4 transition periods per year when the offset between two cities is temporarily different from what it usually is. If you booked a recurring meeting three months ago, the calendar invite may show the wrong time in one location during a transition week.
2026 DST Transition Dates to Watch
March 8, 2026: US springs forward — US/UK gap shrinks by 1 hour for 3 weeks
March 29, 2026: UK/EU spring forward — standard offsets resume
November 1, 2026: US falls back — US/India gap grows by 1 hour
Tips for International Meeting Scheduling
Always specify the time zone explicitly. '3 PM' is ambiguous. '3 PM EST' or '3 PM New York time' removes all ambiguity. Calendar apps like Google Calendar and Outlook show the event in each attendee's local time automatically when the time zone is set correctly in the invite.
Check the current offset before each meeting during transition weeks. Don't rely on memory — the offset changes twice a year per country. A quick check with the converter takes 10 seconds.
For recurring US–India calls: IST doesn't change. The meeting effectively moves by 1 hour from your perspective every time the US clocks change. Adjust recurring invites accordingly.
Frequently Asked Questions
What is the difference between UTC and GMT?
UTC (Coordinated Universal Time) is the modern international standard. GMT (Greenwich Mean Time) is the historical predecessor. For practical purposes they are the same — both represent zero offset. UTC is the technically correct term for scheduling; GMT is used colloquially.
Does India have time zones?
India has a single time zone — IST (UTC+5:30) — used across the entire country. It doesn't observe Daylight Saving Time. The +5:30 half-hour offset is unusual globally and is a common source of scheduling errors.
