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The DAY_OF_YEAR function returns an array of integers containing the day of the year for each element of an array of IDLDT date/time variables. The result is an array of integers in the range 1-365 (1-366 for leap years).
 
PRINT, DAY_OF_YEAR(TODAY())	;
Print the day of year for the day this was written, using the 
TODAY function.