If break starts, break ends are given, subtracts time from total duration.

Return value

String Time hh:mm[:ss]

Arguments

$time1

string Fieldname

Start time

$time2

string Fieldname

End time

$break1

string Fieldname

Break starts

$break2

string Fieldname

Break ends

Full documentation

Calculate duration between two timestamps

$duration = $Workhour->kesto('start_time','end_time');

Calculate duration. Subtract possible break:

$duration = $Workhour->kesto('start_time','end_time','break_starts','break_ends');