@p @karna @EdBoatConnoisseur @skylar @theorytoe

How did you solve it?
I thought that maybe you could use unix time for everything. Then the problem becomes only a matter of presentation. Hours charged and scheduling will always be correct, you'll just have to remind the user for the various quirks, like having one hour charged while the local clock would go forward by two. But you don't have to program any logic for this.