Using the WIL language it is possible to grab the day of the year. The following example from TimeJulianDay grabs the current time and day of the year.
;TimeDayOfYear now=TimeYmdHms() year=ItemExtract(1,now,":") Jan01=StrCat(year,":01:01:00:00:00") dayofyear=TimeDiffDays(now,Jan01)+1 Message("Day of Year",dayofyear)