Ping!
F the Islamic Calendar.
Hey, I’m already down with celebrating the New Year, though I find GMT to be convenient as the official marker so I can go to bed on time.
This difference is the result of a mind-bending principle of navigation, in which ships gain ground on or lose time, depending on what direction they go.
So the author has problems with time concepts more difficult than a sundial.
The first isn't all that difficult. The year is 365 days 5 hours 48 minutes 46 seconds long. That means you need 97 leap days every 400 years. Now spread them as evenly as you can.
The second probably left her confounded by the end of Around the World in Eighty Days.