dbd( (days between dates) calculates the number of days between two different dates. The range for both dates is Jan. 1, 1950 through Dec. 31, 2049. The dates are not entered in lists; They are entered as either MM.DDYY or DDMM.YY, DD being the zero-padded number of the date, MM being the zero-padded month number, YY being the last two digits of the year, and . being a decimal point.
in the catalog
Both of these lines will return the same amount. They return the number of days since the first day of the year.