
=IF(PlannedFinishDate="","",IF([Revised Planned Date]="",PlannedFinishDate,[Revised Planned Date]))
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=IF([Revised Planned Date]="",PlannedFinishDate,[Revised Planned Date]) is the one working
However,
If Both Revised Planned Date and Planned Finish Date are blank show blank.
Currently shows 12/30/1899 in my output when both are blank.
=IF(PlannedFinishDate="","",IF([Revised Planned Date]="",PlannedFinishDate,[Revised Planned Date]))
Based on your original post, I understand that if Both Revised Planned Date and Planned Finish Date are blank, the calculated column shows blank. If not both Revised Planned Date and Planned Finish Date are blank, the calculated column shows the value same as Revised Planned Date. If I misunderstand your requirement, please correct me.
You could use following formula in the calculated column.
=IF(AND(ISBLANK([Revised Planned Date]),ISBLANK([Planned Finish Date])),"",[Revised Planned Date])
Result:
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