5 free time, date, and timezone conversion apps for Android
1. World Time Buddy
World Time Buddy (WTB) is a famous online converter that offers a free native app. Like the website itself, the app's a cross between a world clock, time zone converter, and online meeting scheduler. Unlike the website, though, it works offline, covering as many as 20,000 locations. It lets you easily convert between multiple time zones for the times you have to plan and schedule conference calls, carry out international meetings, or have to know the best time to connect with friends and family abroad. WTB supports portrait and landscape use, making it a suitable choice for smartphones and tablets. It lets one see nearby hours by scrolling side-to-side or up and down. There's also full DST support, complete with warnings being issued in advance.
WTB is free to use, but an in-app purchase unlocks more locations, location groups, and removes ads.
2. Time Converter & World Clock
This is a solid Android app for time conversion, which would come in handy if you tend to communicate with people in multiple time zones. Its feature set lets you convert date and time, search time zones with city and country tags, add events straight to the calendar app you're using, and share schedules across multiple time zones to people you know. TC&WC supports time zones for over 500 cities specifically, and you may find it pretty useful for scheduling Skype meetings, planning trips, and staying in touch with people at a distance.
tCalc is, quite literally, a time calculator meant for those who'd rather take a mathematical approach to figuring out the differences in time zones. The Time Calc automatically recognizes the time format as you enter numbers. Just like any sensible calc, this one supports addition, subtraction, multiplication, and division – as well as expressions (in mixed time unit formats), so you can bust out some truly complicated time math! It also shows calculation results in different formats. There's also the smart paste feature, which automatically converts time from "DDd. HH:MM:SS" to a "HH:MM:SS" format. Alongside that, you can use additional buttons in landscape mode, get different calculation result formats, and copy calc results to the clipboard.
4. Time Map
Time Map's developer took "a great map with time zone boundaries by TimeZonesBoy on Wikipedia", integrated it with his application, and made it show the correct time on every zone. As some countries use daylight saving time, he settled on showing the time on boundaries of DST. The app uses the "Olson timezone database", which is a frequently updated set of timezones. But the application doesn't connect to the internet to refresh times. It gets updated timezone information in new releases that correspond with database updates.
The map cannot be zoomed in or out, as it's supposed to work with minimum scrolling. The times are calculated on the start or return to the application, meaning they are not automatically refreshed. Thus, you can just get the desired time and close or switch to another application. However, there could be some errors for countries in Daylight Saving Time, because the beginning and end of DST aren't the same everywhere.
5. Time Conversion
With this Time Conversion app, you can easily calculate different time values into and between each other. It lets you convert values by choosing seconds, minutes, hours and days. And in the output bar, you can see all available variations of the conversion. Nifty!