Formula to keep adjacent cell blank when no date is added!

I have a formula in my spreadsheet that shows dates for servicing of products. Column F show's Date Last Serviced and the adjacent column (G) then shows Date Next Service. When there is nothing on the F column's cell then the date that appears on my spreadsheet is 31/12/00. It looks messy and I would rather have a formula to make it so that if the F column is blank, then the adjacent cell in G column should stay blank also.

To automatically calculate the next service due date, I have variants of this formula that creates the dates in G column:

=DATE(YEAR(F4)+1,MONTH(F4),DAY(F4))

I tried adding as an extra part, for example:

=DATE(YEAR(F4)+1,MONTH(F4),DAY(F4))&If(F4 = 0, "", F4)

It always brings back the answer of 366, and does not make the cell blank...

Any help?

Try

=IF(F4="","",DATE(YEAR(F4)+1,MONTH(F4),DAY(F4)))