Hmm… sorry about that!
This is a bug we have found in version 2.4.1 and is already fixed in the next version 2.7.1. The reason it is happening is that your time clock is set as 12-hour format and possibly using a different language other than English. When you install the app and open it the very first time then this error can occur.
To solve it in version 2.4.1 please have your clock set as 24-hour format (you can do this in the General settings, under date & time) and open the magazine. After that, if you want, you can change the clock back to the 12-hour format.