Generate time entries only for empty days

Content

Hello,

is it possible to generate time entries somehow only for days with no entry ?

There is check box to skip days with Absences, but what if there is already time entry? Can we somehow skip these days and don't create hours on top of existing? We would like to simply generate only missing days at the end of month, but don't want to touch days where is already existing any entry. 

Thanks, David