January 1 is the first day of the year, and December 31 is the last day. But what about all those days in between? The following formula returns the day of the year for a date stored in cell A1:

=A1-DATE(YEAR(A1),1,0)

The following formula returns the number of days remaining in the year after a particular date (assumed to be in cell A1):

=DATE(YEAR(A1),12,31)-A1

When you enter either of these formulas, Excel applies date formatting to the cell. You need to apply a nondate number format to view the result as a number.

To convert a particular day of the year (for example, the ninetieth day of the year) to an actual date in a specified year, use the formula that follows. This formula assumes that the year is stored in cell A1 and the day of the year is stored in cell B1:

=DATE(A1,1,B1)

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