how can i find the first day of a cell?

[Harry0]

I tried to use {=INDEX(range,MATCH(FALSE,ISBLANK(range),0))}

But it does not seem to work despite I thought that it did
{=INDEX(AB1:HY1,MATCH(FALSE,ISBLANK(AB3:HY3),0))}
Any other formulas to suggest?

The top row has dates and under it has many rows and I need to find for each row when it first had a number.

I am using 2011 excel
Thanks

 

[Harry0]

I FOUND IT WHICH IT WAS
=INDEX(AC$1:HZ$1,MATCH(TRUE,AC3:HZ3>0,0)),"")

 

[AVK]

can you share your sample file with required outcomes result.