Recently, I had some German (Pfalz, Bavaria) records from the ealry 1800s translated. The records contained dates that were specified in an unusual format, and I was curious to know what these were. The dates referred to birth dates of children of a couple.
Specifically, the dates were:
1. Nivos Jahr 8 24te Frim. J. 13
These dates were translated as
first of Nivose Year 8 the 24th of Frimaire Year 13
The dates were all recorded on 19 Oct 1808, and that is how the date was recorded. Interestingly, the birth date of one of the children was recorded as "30. Dezember 1797".