System Time into 24-hour format

[m3lvin102910 (Melvin Bagasol)]

How can I set System Time to 24hour format, without manually setting up the time format on my Android Phone?

[bodymindpower (Anke)]

Set format (pattern) to → HH:mm:ss

Timepicker Minuten less than 10

Duration between two saved instances from time picker(s)