Timezone Converter and Meeting Planner
Convert a time across time zones with correct daylight saving, and find the hours that overlap for a meeting. Add as many zones as you need, set working hours, and read the shared window at a glance. Everything runs in your browser.
Time zones
- Reference
Convert a time
Meeting planner
No hour falls within working hours for every zone. Widen the working hours or drop a zone.
Offsets are read for the selected date, so daylight saving for that day is already taken into account.
Your times and zones stay on your device. Nothing is uploaded.
What this tool does
Timezone Converter and Meeting Planner does two jobs. First, it converts a single moment from one zone to every zone on your list, showing the local date, time and UTC offset for each. Second, it lays out a meeting planner grid: for the reference day it maps every hour across your zones and highlights the hours that fall inside everyone's working day, so the best time to meet is easy to spot. Daylight saving is always correct because each offset is read from your device's own time zone database for that exact instant, with no bundled data and no heavy library. Nothing is uploaded; the whole tool runs in your browser.
tools.timezone-converter.relatedMention
What you can use it for
- Find a meeting slot that lands in working hours for teammates in New York, Madrid and Tokyo at once.
- Convert a launch time or a webinar start into every attendee's local time.
- Check what a UTC deadline means for a colleague on the other side of the world.
- See how a time shifts around a daylight saving change so nobody joins an hour early or late.
- Plan a call with family or clients abroad without doing the offset math by hand.
How to use it
- Add the zones you care about. Your own zone is added first as the reference.
- Pick a date, a time and the source zone to convert that exact moment into every zone.
- Set the working hours that count as a reasonable time to meet.
- Read the grid: green cells are inside working hours, and outlined columns are hours where everyone overlaps.
- Copy a single converted time or the whole list to share it.
Everything runs inside your browser. No file is uploaded to any server. See more tools in this field.
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Frequently asked questions
Is daylight saving time handled correctly?
Yes. Every offset is read from your device's own IANA time zone database for the specific instant being shown, not from a fixed number. A zone that is UTC-5 in winter reports UTC-4 in summer automatically, and a conversion across a clock change lands on the right hour. That is why the tool needs no bundled offset data and no external service.
Where does the list of time zones come from?
From the platform itself, through the browser's Intl support for the tz database (Intl.supportedValuesOf). There is no time zone package to download and nothing to keep updated by hand: you get the same list your operating system uses. On very old engines that lack this feature the tool falls back to a short curated list of common zones.
How do I read the meeting overlap grid?
Each row is a time zone and each column is an hour of the reference day in your first zone. The cell shows the local hour in that zone. Cells inside the working hours you set are tinted, and a column where every zone is inside working hours is outlined as a shared slot. The summary line above the grid lists those overlapping ranges directly.
What do the working hours control?
They define what counts as a reasonable time to meet, for example 09:00 to 18:00. The grid then highlights the hours that sit inside that window for each zone, and marks the columns where all zones overlap. A window can even wrap past midnight, like 22:00 to 06:00, if you are planning around a night shift.
Do my inputs leave my device?
No. All the conversion and the grid are computed locally in your browser using the time zone data already on your device. Nothing about the dates, times or zones you enter is uploaded anywhere.