Hi all,
So I was having this weird behavior between running a DLL or the raw program. It turned out to be caused by the Date data type to change into a DateTime data type when accessed from a DLL. This will affect codes like this:

lparameter cDate
for i = 1 to 7 && days of week
   * your code passed cDate = ctod('1/1/08')
   * this has a very bad result (AND no error reported) if cDate is a DateTime data type.
   ? cDate + i
endfor

Sample code to reproduce the buggy behavior:

*oDateBug = createobject('DateBug.DateBug') && use this when testing the DLL.
oDateBug = createobject('DateBug')
oDateBug.DateProperty=ctod('3/3/08')
wait window oDateBug.GetDateProperty()
oDateBug = null
release oDateBug

define class DateBug as Session olepublic
   DateProperty = ctod('')
   procedure GetDateProperty()
      return "Type: "+type('this.DateProperty')+" Value:"+transform(this.DateProperty)
   endproc
enddefine

1. Run the program as is from VFP. The correct and expected datatype is returned.
2.1 Create a DateBug project and add the code. Set Main. Compile DLL.
2.2 Uncomment the first line and comment the second line then run the code. DateTime type is returned when the code uses the DLL.

See related thread: Thread ID: 1307380 Message ID: 1307380