Question
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I need to display a date with the 2 digit century value prefixing the 
year. How do I do this?

Answer
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Here is one way to solve this problem:

Note that in the following example, |INVDATE| is the invoice date, the
Progress date format is mmddyy, and the output date format desired is
CCYYMMDD, where "CC" represents the century, "YY" represents the year, 
"MM" represents the month and "DD" represents the day of the month.
  
- Create a function keyword:

  Funct. Keyword: YEAROFDT
        Description: CALCULATES THE CENTURY
      
  Return-value: character
    Funct. Formula: IF(INT(SUBSTR(STRING(|INVDATE|) ,1,2)) >50 AND
                          INT(SUBSTR(STRING(|INVDATE|) ,1,2)) <99) THEN
"20" ELSE "19"         

- Here is how you may map the outbound formula:

outbound type: character                         
Formula: |YEAROFDT| + SUBSTR(STRING(|INVDATE|) ,7,2) +
       SUBSTRING(STRING(|INVDATE|) ,1,2) +
    SUBSTRING(STRING(|INVDATE|) ,4,2)