NDAYINYEAR(x;m) the number of the day in year corresponding to data-time value
x, and starting the year at the beginning of month
m (default 1). You can use
MFRACTION(x;1;1) instead of
NDAYINYEAR to obtain a day number within the year that will be the same for each day-month combination, whether or not this is a leap year.
Updated on December 4, 2017