Используйте приложение APKPure
Историческую версию World Time можно получить на Android
Конвертировать точки времени между часовыми поясами
This is a small app for converting times between time zones.
It can either display the current time in different zones or save a number of events at specific dates in specific zones and convert those dates to local time.
This app is open source and licensed under the GNU General Public License, Version 3. Source Code is available on GitHub: https://github.com/thestr4ng3r/worldtime-android