Can I use this converter for meetings?

Yes, it is useful for common meeting planning, but critical travel, employment or legal deadlines should be checked against the official source as well.

Time & Dates

Time Zone Converter

Q: Why does the converted date sometimes change?

The converted date can change when the destination time zone is many hours ahead or behind the source time zone.

Q: Is London always the same as UTC?

No. London is usually on GMT in winter and BST in summer, so the selected date matters.

Convert a time from one time zone to another, with the converted date, weekday, UTC offset and a simple GMT/BST or daylight-saving note.

Convert a time How it works

Convert time zones

Enter a date and time, choose the source time zone, then pick where you want to convert it to.

Date

Time

From time zone

To time zone

Display format Use the date of the actual event or meeting. Time-zone offsets can change with daylight saving.

Converted time

—

Enter a date and time to convert.

—Converted date

—Weekday

—Source UTC offset

—Destination UTC offset

—Date shift

—UTC equivalent

How the time zone converter works

The converter treats your source time as a local time in the selected source zone, converts it to a UTC instant, then displays that same instant in the destination time zone.

Source local date and time → UTC instant → Destination local date and time

This matters because the converted date may be the previous day, the same day or the next day depending on the offset between the two zones.

GMT, BST and daylight saving

For UK times, London is not always the same as UTC. In winter the UK uses GMT. In summer the UK usually uses British Summer Time, which is one hour ahead of GMT.

The calculator uses the selected date when converting, so a London time in June may convert differently from a London time in December.

Tip: when arranging meetings, always convert the actual meeting date rather than using a rough “UK is five hours ahead” shortcut.

Example conversions

Source time	Destination	What to check
09:00 London in June	New York	London is usually on BST, so check the actual date.
22:00 London	Tokyo	The destination date may move to the next day.
09:00 London in December	New York	London is usually on GMT in winter.

Useful time-zone terms

UTC GMT Daylight saving time Time zone