Determines the day of the year for a specific date

     DOY([<dDate>]) --> nDayOfYear


     <dDate>  Designates which date to use to calculate the day of the
     year.  The default is the system date.


     DOY() returns a calendar day number that specifies which day of the year
     <dDate> represents.


     If you frequently work with time periods, then this function is quite
     useful.  DOY() lets you assign a calendar day number to a date that
     relates to the beginning of the year.


     .  When no date is specified, DOY() uses the system date.
        January 1 is always 1, December 31 is 366 in a leap year; otherwise,
        it is 365.  An empty date returns a 0 result.

? DATE(), DOY()
dDate := CTOD("12.12.2012")
? dDate, DOY( dDate)

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