A drinking day that ends at 7am
A night out does not reset just because the clock strikes midnight. A drink at 01:00 still belongs to the evening you were actually having, and your alcohol tracker should reflect that.
KATER ZERRO uses a logging day from 07:00 to 07:00. Drinks after midnight stay attributed to the previous evening, so a late beer, cocktail or nightcap does not get split away from the rest of the night.
That makes your daily totals, dry days and next-day comparisons easier to read. The calendar follows real life instead of forcing every evening into an artificial midnight cutoff.
Logging remains quick: tap a familiar drink, let favourites move to the front, then edit an entry later if needed. You can also mark a Dry Day deliberately, so an alcohol-free day never looks like a forgotten entry.