Microsoft Office Tutorials and References
In Depth Information
Thanksgiving Day
Thanksgiving Day is celebrated on the fourth Thursday in November. This formula calculates Thanksgiving
Day for the year in cell A1:
=DATE(A1,11,1)+IF(5<WEEKDAY(DATE(A1,11,1)),7-WEEKDAY
(DATE(A1,11,1))+5,5-WEEKDAY(DATE(A1,11,1)))+((4-1)*7)
Christmas Day
This holiday always falls on December 25:
=DATE(A1,12,25)
Determining the last day of a month
To determine the date that corresponds to the last day of a month, you can use the DATE function. However,
you need to increment the month by 1, and use a day value of 0 (zero). In other words, the 0th day of the next
month is the last day of the current month.
The following formula assumes that a date is stored in cell A1. The formula returns the date that corresponds to
the last day of the month.
=DATE(YEAR(A1),MONTH(A1)+1,0)
You can use a variation of this formula to determine how many days make up a specified month. The formula
that follows returns an integer that corresponds to the number of days in the month for the date in cell A1.
=DAY(DATE(YEAR(A1),MONTH(A1)+1,0))
Determining whether a year is a leap year
To determine whether a particular year is a leap year, you can write a formula that determines whether the 29th
day of February occurs in February or March. You can take advantage of the fact that Excel's DATE function
adjusts the result when you supply an invalid argument — for example, a day of 29 when February contains
only 28 days.
The following formula returns TRUE if the year in cell A1 is a leap year; otherwise, it returns FALSE:
=IF(MONTH(DATE(A1,2,29))=2,TRUE,FALSE)
This function returns the wrong result (TRUE) if the year is 1900. See the section “The
Excel leap year bug,” earlier in this chapter.
The following formula is a bit more complicated, but it correctly identifies 1900 as a non-leap year. This for-
mula assumes that cell A1 contains a year.
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