Quick brief

What to know before you calculate

A short read on the assumptions, trade-offs and definitions that shape the answer.

  • A time zone is not always the same as a fixed UTC offset.
  • Daylight saving time can change the offset for only part of the year.
  • Good meeting windows consider working hours, date changes and follow-up time.

Use locations, not just offsets

A UTC offset tells you the current difference from UTC, but a location-based time zone can change through the year. London, New York and Sydney do not all change clocks on the same dates, so a recurring meeting can shift unless the actual location time zone is used.

Watch for the date change

A time that looks convenient in one country may fall on the previous or next day elsewhere. This matters for deadlines, launch times, webinars and support cover. Always check both the local time and the local date for each participant.

Choose a humane overlap

The mathematically possible meeting time is not always the fair meeting time. Rotate inconvenient slots for regular calls, avoid very early or very late times where possible, and leave enough working time after the meeting for action points.

Confirm in writing

After choosing a slot, write the meeting time with the time zone and date. For important events, include a calendar invite so each participant sees the correct local time on their own device.

Related calculators

Try the numbers yourself

Open the calculators that match this topic and test the result with your own inputs.

Time ZoneConvert a date and time between two UTC offsets, with the time difference and converted local time.HoursCalculate hours between two times with an optional break, including shifts that cross midnight.CountdownCount days, weeks and approximate months until a future date for deadlines, events and planning.Date DifferenceCount days, weeks, months and years between two dates, with optional inclusive counting for deadlines and planning.