To make things even more complicated, there are different currencies, which means I need to keep track of staying aircaft type current (C150, C152, and C172) as well as DAY and NIGHT current.
(or officially spoken a pilot keeps current whenever (s)he is doing 3 takeoffs and landings within the 90 days, but I focus on landings only as I always do the takeoffs). So the rule here and pretty much around the world is that your currency counts from your Now I'd like to add a "currency-calculator", which should show me until when I am type and day/night current based on my landings.
I recently got my pilots license and started using Microsoft Excel as my backup logbook.