excel - Right to left offset formula with match -

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i'm looking return start , end dates of person availability based upon gantt chart of hours on project.

i can @ minute return start of availability, formula looking left right , returning date of first "0" cell meets.

i need formula right left , return date of cell of last "0" meets.

formula is: =iferror(offset(b3,(row(b3)-2)*-1,match(0,c3:o3,0)),"")

data available here

this formula return results you're after:
{=index($c$2:$s4,1,max(if($c4:$s4>0,column($c4:$s4),0)))}

enter array/cse formula (use ctrl+shift+enter complete formula - put curly brackets in).

nb: return 00/01/1900 if last date greater 0.
adding custom format result cells hide 00/01/1900: dd/mm/yyyy;;;

i used reference answer: http://www.mrexcel.com/forum/excel-questions/234469-find-last-value-row-greater-than-zero.html


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