Gerta

Schedule meetings around the world with Gerta. This app helps you schedule meetings in different timezones easily. You plan your meeting with one base location, the date and time and the app shows you the timings for your other cities in the different timezones.
Permissions
Calendar add or modify calendar events and send email to guests without owners' knowledge read calendar events plus confidential information
This permissions are needed to be able to share your meeting details with any calendar app you have installed.
Photos/Media/Files & Storage modify or delete the contents of your USB storage read the contents of your USB storage
This permissions are needed to be able to share your meeting details with any other app like WhatsApp and via E-Mail.
Other full network access view network connections
This permissions are needed to check in which timezone your added city is.