Formulas and Functions

Function Description
“WEEKDAY” (page 59) The WEEKDAY function returns a number that is
the day of the week for a given date.
“WEEKNUM” (page 60) The WEEKNUM function returns the number of
the week within the year for a given date.
“WORKDAY” (page 61) The WORKDAY function returns the date that is
the given number of working days before or after
a given date. Working days exclude weekends
and any other dates specically excluded.
“YEAR” (page 62) The YEAR function returns the year for a given
date/time value.
“YEARFRAC” (page 63) The YEARFRAC function nds the fraction of a
year represented by the number of whole days
between two dates.
DATE
The DATE function combines separate values for year, month, and day and returns a
date/time value. Although dates can usually be entered directly as strings (for example,
“12/31/2010”), using the DATE function ensures the date will be interpreted consistently
regardless of the date format specied in System Preferences (search for “date format”
in the System Preferences window).
DATE(year, month, day)
 year: The year to include in the value returned. year is a number value. The value
isn’t converted. If you specify 10, the year 10 is used, not the year 1910 or 2010.
 month: The month to include in the value returned. month is a number and should
be in the range 1 to 12.
 day: The day to include in the value returned. day is a number value and should be
in the range 1 to the number of days in month.
Examples
If A1 contains 2014, A2 contains 11, and A3 contains 10:
=DATE(A1, A2, A3) returns Nov 10, 2014, which is displayed according to the cell’s current format.
=DATE(A1, A3, A2) returns Oct 11, 2014.
=DATE(2012, 2, 14) returns Feb 14, 2012.
Related Topics
For related functions and additional information, see:
“DURATION” on page 70
44 Chapter 3 Date and Time Functions