Leaving a Cell Blank if one value of the formula is blank

Hello,

I was making a template to be distributed to multiple receivers. Since the template is blank and must automatically count the number of days an employee has been around since the date of employment, i could not find the right formula where the cell with the difference between two dates will appear blank if one of the cell is blank.

Please see the example below:
- A1 = to the hire date of the employee
- A2 = automatically computes for the days of tenure with this formula: (TODAY())-A1

The problem is if cell A1 is blank, A2 will show 41223. This is a file template that needs to be sent and A1 should be left blank for the receiver to fill with the appropriate information.

I hope someone could give me the right formula to this.