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.
Learn More About Timezone Converter
Why time zone conversion needs a date
Time zone offsets are not fixed all year. Daylight saving time and local clock changes can shift the difference between two cities by an hour or more, so the same conversion may produce a different result in summer than in winter.
That is why this tool asks for a date as well as a time. It helps match the result to the real calendar rules that apply on that day.
Example meeting conversion
If you schedule a call for 3:00 PM in New York, the matching time in London can vary depending on whether each location is observing daylight saving time. The converter helps you verify the exact local time before you send an invite.
This is especially helpful for remote teams, interviews, webinars, and customer support schedules that span multiple countries.
Common time zone mistakes to avoid
A frequent mistake is assuming a city always stays the same number of hours ahead or behind another city. Another is confusing a location name with a broader region that follows different daylight saving rules.
Double-check the source and destination zones, the selected date, and whether the event should be interpreted in local time or a fixed reference time like UTC.
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.