IS ERROR with nested if statement

I'm trying to make the the following line

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deal with error handling but i just can't seem to get the sytax for iferror correct. At the moment when C62 and E59,D59,C59 are blank I'm getting the #NUM error.

Thanks for any help

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IFERROR will not work in 2003 version

Use instead

=IF(ISERROR(IF($C$62="",DATE($E$59,$D$59,$C$59),DATE($E$62, $D$62,$C$62))),"",IF($C$62="",DATE($E$59,$D$59,$C$59),DATE($E$62, $D$62,$C$62)))