Time Zone Converter
Pick two cities and a time to see what the clock says in both places, side by side. Daylight saving changes are handled automatically using real IANA time zone data, so you never have to look up when DST starts. The built in meeting planner highlights overlapping business hours so you can schedule across continents without the mental math.
Last updated: October 22, 2026
Your result
Converted times are computed from authoritative IANA time zone rules, including daylight saving changes.
The formula
local_time_B = UTC_time + offset_Bdifference_hours = offset_B minus offset_ADST shifts the offset by +1 hour during the local summer (from IANA rules)the converted date rolls forward or backward automatically when the difference crosses midnight
A worked example
12:00 in Karachi (Asia/Karachi, UTC+5) = 07:00 UTC = 02:00 in New York (EST, UTC-5), a 10 hour difference, shown with the correct date on both sides.
More about the Time Zone Converter
Beating the +1 day trap
Choose the from and to cities, enter the time you care about, or just leave it on now, and the converter shows the local time in both places side by side, with the hour difference and any date rollover flagged. Offsets come from IANA time zone data with the DST rules in force on that date, so a March meeting converts correctly even though the clocks change that month. The converted date is the real point: it's what catches the 22:00 New York call that's 08:00 the next day in Karachi (07:00 while US daylight saving is in force).
Make the converter's output your meeting protocol: write both times in the invitation, 15:00 Dubai / 11:00 London, and never trust a memorised offset near the clock change weekends. Run the conversion fresh, because a one hour DST shift is exactly how someone ends up waiting an hour alone.
How to use the Time Zone Converter
- Choose the "from" city.
- Choose the "to" city.
- Enter the time you care about (or leave it on "now").
- Read both local times plus the hour difference between them.
Frequently asked questions
Does the converter handle daylight saving time?
It does. Offsets come from IANA time zone data with DST rules built in, so the conversion holds whether it's January or July. You never need to know when DST starts or ends.
Can I convert a future date?
Yes, enter any date and time. The tool applies the DST rules in force on that date, which matters most near the spring and autumn clock changes.
What does the "+1 day" note mean?
It means the converted time lands on the next calendar day at the destination. A 22:00 call in New York is a 08:00 next day call in Karachi (07:00 during US daylight saving), the tool flags it so the date never slips past you.
Which cities are covered?
The dataset covers roughly 80 major cities worldwide. If your place isn't listed, pick the nearest major city in the same time zone.
Why does my meeting tool show a different time?
Most likely a DST boundary, if one city changes its clocks this weekend and the other doesn't, the offset shifts by an hour. This tool follows current IANA rules, which are the authoritative source.
How do I schedule a meeting across time zones?
Propose a time, then run it through the converter once for each attendee's city, the tool handles one pair at a time, so a London, New York, Karachi call takes two quick conversions. One practical shortcut: aim for 14:00 to 16:00 UTC, which lands inside working hours for Europe and the Americas at once; Asia usually needs its own slot.
Can I convert to multiple time zones at once?
Not in one view, each conversion covers one city pair, so a five city team needs four quick conversions. The upside is that every result carries its own date and any “+1 day” flag, so the day never gets lost when the time crosses midnight.
How should I write meeting times in an international email?
Write the time in every relevant time zone, for example, "15:00 Dubai / 11:00 London", and name the actual date in each place when they differ. It takes two seconds and removes every possible misunderstanding, which a single time plus an abbreviation never quite does.
How do I find the time difference between two cities?
Enter both cities in the timezone converter and it shows each city's local time plus the hour difference. It accounts for daylight saving automatically. For example, a 10 AM call from Karachi is 6 AM in London when London is on GMT.