It could be worse - before 1805 on a Royal Navy ships PM would come before AM: "Up to late 1805 the Royal Navy used three days: nautical, civil (or "natural"),

It could be worse - before 1805 on a Royal Navy ships PM would come before AM: "Up to late 1805 the Royal Navy used three days: nautical, civil (or "natural"), and astronomical. For example, a nautical day of 10 July, would commence at noon on 9 July civil reckoning and end noon on 10 July civil reckoning, with PM coming before AM. The astronomical day of 10 July, would commence at noon of 10 July civil reckoning and ended at noon on 11 July" https://en.wikipedia.org/wiki/Nautical_time#Nautical_day https://en.wikipedia.org/wiki/Nautical_time#Nautical_day