I suspect you have real dates in C16 but in your formula you are using text
Try =IF(C16<=DATE(2005,9,15),.........
best wishes
--
Bernard V Liengme
www.stfx.ca/people/bliengme
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"PW" wrote in message
...
the formula that I am trying does not return the results that I need.

=IF(C16<="14-Sep-05",SUM(F16*$S$1),IF(C16="15-Sep-05",SUM(F16*$S$2)))

Cell C16= date
Cell F16= Kilometers
Cell S1=0.37
and
Cell S2=0.40

The result I am getting is for the first part of the formula and not for
the
second part when the date is greater than or equal to 15-Sep-05.