CalcHub

Timezone Converter

Convert time between any two world timezones. Select a date to account for daylight saving time.

DST rules vary by date — today's date is pre-filled.

Frequently Asked Questions

How accurate is this timezone converter?

This converter uses your browser's built-in timezone data to calculate offsets accurately. For dates in the past, it applies historical daylight saving time rules where available. For any date in the future, DST rules are applied based on current law — though some countries have changed DST rules retrospectively.

Why should I select a date when converting time?

Daylight saving time (DST) means the same time difference between two timezones can change depending on the date. For example, New York and London are 5 hours apart during EST but only 4 hours apart during EDT. Selecting a date ensures the calculation uses the correct offset.

What is the difference between AM/PM and 24-hour format?

AM/PM (12-hour) format runs from 12:00 AM (midnight) to 11:59 PM, cycling twice daily. The 24-hour format runs from 00:00 (midnight) to 23:59 (11 PM), cycling once daily. The 24-hour format is standard in most of the world and is used in aviation, military, and computing contexts.

Why does my conversion show a different result than I expected?

The most common cause is DST not being accounted for. Also check that you selected the correct timezones — many countries and regions share similar names but have different offsets. Also verify whether your browser's clock reflects your actual local time.