Scheduling a call across time zones always turns into the same mental math: is 2pm here a reasonable hour for the team in Mumbai, or are you about to ping someone at midnight? Worldclock Timezone Converter by Techsial handles this on Android with a scrollable list of cities. We built Zone Sync, a free time zone converter that runs right here in your browser: pick a home zone, add the cities you coordinate with, then drag one slider and watch every clock move together. No install, no signup.
Convert time zones now
It loads with your detected zone plus three popular cities already set. Drag the slider or use the arrow keys to shift the meeting time.
How to use it
Zone Sync opens with your browser’s detected time zone as home, plus a few widely used cities already added, so the first thing you see is real, moving data. Change your home zone from the dropdown at the top, then use the picker below the list to add up to five more cities, grouped by region, and remove any with the x button on its row. Drag the slider (or tab to it and press the arrow keys) to move the meeting time up to twelve hours forward or backward from now, and every zone’s clock, date, and offset update together instantly. Any city where the resulting time falls before 8am or after 8pm gets a clear “outside 8am-8pm” label, not just a color change, so you can spot an unfair meeting slot at a glance. Your zone list and slider position are saved on your device only; nothing leaves your browser.
How it compares to Worldclock Timezone Converter
Zone Sync keeps the part of the original app that people actually reach for: a quick way to line up several cities’ local times and see how they shift relative to each other. Dragging the slider to test different meeting slots and the plain-language unsociable-hours flag both come straight from that same job.
What we left out is everything that turns a converter into a full scheduling app. Worldclock Timezone Converter can add a home screen widget so the time list is visible without opening anything, sort and search a much longer list of cities and countries, show sunrise and sunset alongside the clock, and keep working fully offline with no ads once installed. Zone Sync caps out at six zones at a time and has no widget, no notifications, and no way to check a date days or weeks out beyond the twelve-hour slider window.
Use Zone Sync when you need to sanity-check a meeting time right now, in a tab, with nobody watching. Get the full app when time zones are part of your daily routine and a always-visible widget or a longer city list would actually save you time.
Get the full app
Worldclock Timezone Converter is free on Android, works entirely offline once installed, and can show its city list right on your home screen through its widget.
Frequently asked questions
What time is it in London right now?
Zone Sync shows this the moment it loads. Add London from the zone picker if it isn’t already in your list, and its current local time appears next to your home zone with no extra steps.
How do I plan a meeting across time zones?
Add every city involved to your zone list, then drag the slider away from “now” until you find a time where none of the cities show the “outside 8am-8pm” flag. That slot is a reasonable meeting time for everyone on the list.
Does the converter account for daylight saving time?
Yes. Zone Sync reads each zone’s current offset from your browser’s built-in time zone data, the same data your phone and computer already use, so daylight saving shifts are handled automatically without any manual adjustment.
Is this the official Techsial app?
No. Zone Sync is an original tool we built, inspired by the time zone comparison feature in Worldclock Timezone Converter by Techsial. It is not affiliated with, endorsed by, or connected to Techsial in any way. For the full app with a home screen widget and offline support, get Worldclock Timezone Converter from the stores above.
Is Zone Sync free to use?
Yes, completely. There is no signup, no download, and no limit on how many times you use it. Your zone list and slider position are stored in your browser’s local storage on your device, so they are still there next time you open the page.
