#OSCAT_DAY_OF_YEAR := DINT_TO_INT(((#idate * 86400 + 631152000) / 86400) MOD 1461);

IF #OSCAT_DAY_OF_YEAR > 729 THEN

IF #OSCAT_DAY_OF_YEAR > 1095 THEN

#OSCAT_DAY_OF_YEAR := #OSCAT_DAY_OF_YEAR - 1095;

ELSE

#OSCAT_DAY_OF_YEAR := #OSCAT_DAY_OF_YEAR - 729;

END_IF;

ELSIF #OSCAT_DAY_OF_YEAR > 364 THEN

#OSCAT_DAY_OF_YEAR := #OSCAT_DAY_OF_YEAR - 364;

ELSE

#OSCAT_DAY_OF_YEAR := #OSCAT_DAY_OF_YEAR + 1;

END_IF;

 Example (variable names are samples, not true variable names. create your own in a separate DB):

In OB1, I call the following:

• Network 1: call T_CONV
  • IN = DTL#2020-12-31-00:00:00
  • OUT = MyVar_Date
• Network 2: call T_CONV
  • IN = MyVar_Date
  • OUT = MyVar_DINT
• Network 3: call OSCAT_DAY_OF_YEAR
  • idate = MyVar_DINT
  • Ret_Val = MyVar_Int

  
  

With the IN of T_CONV in Network 1 = DTL#2020-12-31-00:00:00, MyVar_Int = 366.

I tested a few other sample dates and the function seems to work properly.

Thanks to the fellow posters who recommended checking out OSCAT, as well as the contributors of OSCAT! Specifically to "hugo", who wrote the original Day_Of_Year function in OSCAT.