Dual calendars seem tricky today, but the almanacs of that time handled it easily, and also handled the dual New Year, which was Jan 1 for some purposes and Mar 25 for others.
"Morgen" is also our perfectly normal word for morning, as in "goedemorgen!", and it also means "tomorrow", which causes less confusion than you might think.
Dual calendars seem tricky today, but the almanacs of that time handled it easily, and also handled the dual New Year, which was Jan 1 for some purposes and Mar 25 for others.
Here's a 1750 almanac that shows how it was done.
https://books.google.com/books?id=tUYsAAAAMAAJ
As a Dutch speaker, I had to look up "morgen", but you are absolutely right.: https://nl.wikipedia.org/wiki/Dagwand
"Morgen" is also our perfectly normal word for morning, as in "goedemorgen!", and it also means "tomorrow", which causes less confusion than you might think.