VFP query displaying 0 or 1 instead of empty string where year is 1900

When using the following select statement empty strings are desired in columns where YEAR(dateFields) = 1900.  This works fine if the first record in a dateField column does not contain 1900, meaning we get dates where desired and empty strings where year = 1900.  If the first record does contain 1900 the entire column for all records is populated with either an empty string or a 0 or a 1.  In the screenshot you can see that, as desired, column FirstInv starts with a valid date and displays an empty string when YEAR(FirstInv) = 1900.  The issue is demonstrated in the columns Ship and SoftClose, both having first records with YEAR(Ship) and Year(SoftClose) = 1900.  The entire columns results are either empty strings, 0 or 1.  

 
SELECT ALLTRIM(ChildJobNum) AS JobNum, ALLTRIM(JobDesc) AS JobDesc, ;
      ALLTRIM(AccountManager) AS AcctMan, ;
      ALLTRIM(ProjectManager) AS ProjMan, ;
      ALLTRIM(DisplayType) AS DisplayType, ;
      ALLTRIM(BoothType) AS BoothType, ;
      IIF(YEAR(dtOrdered)=1900,'',DTOC(dtOrdered)) AS Ordered, ;
      IIF(YEAR(dtShip)=1900,'',DTOC(dtShip))AS Ship, ;
      IIF(YEAR(ShowEndDate)=1900,'',DTOC(ShowEndDate)) AS ShowEnd, ;
      IIF(YEAR(dtSoftClosed)=1900,'',DTOC(dtSoftClosed)) AS SoftClosed, ;
      IIF(YEAR(dtHardClosed)=1900,'',DTOC(dtHardClosed)) AS HardClosed, ;
      IIF(YEAR(dtFirstInv)=1900,'',DTOC(dtFirstInv)) AS FirstInv, ;
      ProductionLeadTime, ReturnTime, ProjectCompletedTime, NotSoftClosed, AccountingReviewTime, NotClosed, ;
      InvoicingTime AS Invoicing, OverallInvTime, NotInvoiced, TotalJobLife AS JobLife ;
FROM SQLResult INTO TABLE (lcDIR_temp + "tLeadTimes")