Old formula =if(a1=' blank','blank ',b1) doesn't work anymore

I used to use this formula all the time. If a cell I was checking was blank then I wanted to return a blank in the cell I was solving for, if the cell I was checking had a value, then I wanted to put something else in. How do I write this formula with the newer versions of excel.

Yes, 2007 is a newer version of excel from my perspective. I've been using excel since the very first version.

I even tried writing the formula as =if(a1>1,b1,"blank") a1 happens to be a date. That didn't even work.

Thank you for your help on this.
Bridget

I think you should try "" as a blank cell unless I am reading your post incorrectly.

Try:

=IF(AND(A1>=1,ISNUMBER(A1)),B1,"blank")

Thank you. I ended up using both @if(A1=" "," ", B1) and @if(A2<0," ",B1) to get it to work. Making the first cell truly blank made all of the difference.
Thank You!
Now if I can figure out how to report that it's been solved, I'll be in business.

Bridget

Thank you too Phuocam, I'll try your =IF(AND(A1>=1,ISNUMBER(A1)),B1,"blank") too for fun. Thank you. Why the AND though?