# Calculating the difference between hours

#### Margarita

##### New Member
What is the formula for a time sheet adding work hours in military time.
Example Cell A1=8:00 and Cell A2=12:00. My formula =Mod(A2-A1,1) will return the correct answer, but the problem is that this formula will return the answer of 16 if nothing is put in cell A2. I want no answer if nothing is in cell A2.

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##### MrExcel MVP
What is the formula for a time sheet adding work hours in military time.
Example Cell A1=8:00 and Cell A2=12:00. My formula =Mod(A2-A1,1) will return the correct answer, but the problem is that this formula will return the answer of 16 if nothing is put in cell A2. I want no answer if nothing is in cell A2.

=IF(A2="","",MOD(A2-A1,1))

#### VoG

##### Legend
Try

=IF(ISBLANK(A2),"",MOD(A2-A1,1))

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