origin
A named vector specifying the month, day, and year for the
origin of the Julian dates. The default is
c(month = 1, day = 1, year = 2000)
.
The default is attr(julianDates, "origin")
if it exists.
dropHour
A logical value indicating whether of not the hour information
should be drop from the specifiation of the dates if none of the
Julian dates are fractional.
The default is attr(julianDates, "dropHour")
if it exists.