Selecting Cell A2 Will Highlight/change Font In Cell A1

How can I change the font color or highlight cell A1, when I select cell A2. Cell A2 is still blank, no value entered yet. I also would like cell A1 to return to original font color or no hightlight when cell A2 is no longer selected (active), whether a value is entered or not in cell A2. Let me clearify, (A1 thru N1) and (A3 thru N3) have diferent dates and the font color is white, as is the cell too. Therefor you can not see the dates in (A1 thru N1) or (A3 thru N3).

However, when any cell (A2 thru N2) or (A4 thru N4) is selected (example A4), the cell above it (cell A3) changes font color or highlights, so the date can be seen in (A3). But when cell (A4) is no longer selected the above cell (A3) hides the date (changes back to white font on white cell). Data or a value is not necessarily entered into (A4) for (A3) to change. (A4) is only selected to show the date in (A3). But if data or value is entered into (A4), the date in (A3) will still be seen until (A4) is no longer selected/active.