Type

Returns

Y

Number of years in the given period

M

Number of months in the given period

D

Number of days in the given period

MD

Difference between days in start_date and end_date, ignoring the months and years.

YM

Difference between months in start_date and end_date, ignoring the days and years.

YD

Difference between the days in start_date and end_date, ignoring the years alone.

Errors

Meaning

#N/A!

• The function could not find the value it was asked to look for. Commonly occurs in VLOOKUP and similar functions.

#NAME!

• The function name is incorrect or invalid.

• The given defined name (if any) is invalid.

• There is a typo in the defined name used in the function.

• Double quotes are missing for text values in the function.

• Colon missing in a cell range reference.

#VALUE!

• The given argument's data type is incorrect or invalid.
  For example, the function =DATE(A1:A3) will return a #VALUE error when a text value is present in the range.

#REF!

• The given cell reference is incorrect or invalid. This error may occur when a cell/range has been deleted, moved, or pasted over.