int frenchtojd(int $month, int $day, int $year)
Converts a date from the French Republican Calendar to a Julian Day Count.
These routines only convert dates in years 1 through 14 (Gregorian dates 22 September 1792 through 22 September 1806). This more than covers the period when the calendar was in use.
The julian day for the given french revolution date as an integer.
- int $month: The month as a number from 1 (for Vendémiaire) to 13 (for the period of 5-6 days at the end of each year)
- int $day: The day as a number from 1 to 30
- int $year: The year as a number between 1 and 14