There could be a super-secret release that offers the expression of a day number in base nineteen.;-)
I did some research on the Mayan calendar and it seems they used a base 20 numbering system. Very interesting. Also, They had two calendars. One was 260 days long (13 * 20) and the other was 360 (18 * 20) plus 5 bad luck days at the end of the year. That gave them 365 days total for each year. Unfortunately they didn't account for the extra quarter day (.256) each year (leap years) so after a couple centuries, their calendars would have been all messed up and no longer tied to the seasons properly.
I'm still curious what the 260 day calendar was for. There are some good theories and the best one is for the pregnancy cycles. It is 260 days from the first missed period to the birth of the child. We currently use a 280 day cycle (40 weeks) but that is from the date of the last period instead of the missed period.
Now, they discovered another Mayan calendar that uses 819 days. I cannot find any reason for this number of days. I thought it could be other planet orbits but Mars takes 686.95 days and Jupiter 4337. The 819 falls in between. Anyone else have any clue what they would count 819 days for?