On Wed, 22 Jul 2009 12:37:11 +0400, "aa" wrote:

When entering a decimal number, SOMETIMES Excel interprets it as a date -
how shall I fix it?


The cell where you enter the number does probably have a date format.
To change this, right click on the cell (or cells), select "Format
Cells..." and then select another format, e.g. "General".

Hope this helps / Lars-Åke