How do I convert time from one city to another?

Calculate the difference between the two cities' UTC offsets and add it to the source time. Or use the site's converter, which does it instantly.

Does the converter account for daylight saving?

Yes. The site's converter uses official time zones with daylight saving applied automatically for the current date.

Why do some differences have 30 minutes?

Because not all zones are whole hours. India (UTC+5:30), Iran (UTC+3:30) and others use half hours.

What is the International Date Line?

It's an imaginary line near the 180° meridian where the date changes. Crossing it west to east, you 'go back' a day.

Time conversion guide across time zones

Converting times between zones is essential for scheduling international meetings, travel, and calls with people in other countries. This guide shows the logic behind conversion and how to avoid common mistakes.

If you just want the quick result, use the site's time zone converter. Here we explain how it works under the hood, so you can trust the result.

How time conversion works

Each city follows a time zone defined by an offset relative to UTC (Coordinated Universal Time). Converting a time is simply adjusting by the difference between two cities' offsets.

For example, New York is UTC-5 and London is UTC+0. The difference is 5 hours, so 08:00 in New York equals 13:00 in London.

Step by step to convert

Find the UTC offset of the source city and the destination city.
Calculate the difference (destination minus source).
Add that difference to the source time.
If the result passes 24h, it's the next day; if it goes negative, it's the previous day.

Common mistakes to avoid

Ignoring daylight saving: many countries move the clock 1 hour for part of the year, changing the difference.
Forgetting 30- or 45-minute zones, like India (UTC+5:30) and Nepal (UTC+5:45).
Not accounting for the day change when crossing the International Date Line.

When to use a converter

Use a converter whenever you need accuracy without manual math: multi-zone meetings, international flights, live broadcasts, or global deadlines.

The site's converter already applies daylight saving automatically, avoiding the most common mistakes.

Quick questions

How do I convert time from one city to another?: Calculate the difference between the two cities' UTC offsets and add it to the source time. Or use the site's converter, which does it instantly.
Does the converter account for daylight saving?: Yes. The site's converter uses official time zones with daylight saving applied automatically for the current date.
Why do some differences have 30 minutes?: Because not all zones are whole hours. India (UTC+5:30), Iran (UTC+3:30) and others use half hours.
What is the International Date Line?: It's an imaginary line near the 180° meridian where the date changes. Crossing it west to east, you 'go back' a day.