As Pilot you probably have to do a lot of the annoying paper work and Calculation of times. After each flight you have to add or subtract the flown times. That is often the time when calculation errors occur.
The time calculator feature is a handy tool for adding or subtracting times. You just enter one time and add or subtract another time. It is fully integrated in the FligtLog App (iOS and Android version).
To use this feature just start the Fligtlog App and tap on More than Time Calculator so you don't any additional app for time calculation

More   Calculator