Microsoft Office Tutorials and References
In Depth Information
Working with date and time functions
are variables that supply the values a function needs to perform its calculations. You place
arguments between the parentheses for functions that require them.)
Similarly, you can type =NOW( ) in a cell or formula to insert the current date and time.
This function also takes no arguments. The result of the function is a serial date and time
value that includes an integer (the date) and a decimal value (the time). Excel doesn’t
update the value of NOW continuously. If the value of a cell that contains the NOW
function isn’t current, you can update the value by recalculating the worksheet. (You recalculate
the worksheet by making a new entry or by pressing F9.) Excel also updates the NOW
function whenever you open or print the worksheet.
The NOW function is an example of a volatile function—that is, a function whose calculated
value is subject to change. Any time you open a worksheet that contains one or more NOW
functions, Excel prompts you to save changes when you close the worksheet, regardless of
whether you made any, because the current value of NOW has changed since the last time
you used the worksheet. (Another example of a volatile function is RAND.)
For more about the RAND function, see “The RAND and RANDBETWEEN functions” in
Chapter 14, “Everyday functions.”
Using the WEEKDAY function
The WEEKDAY function returns the day of the week for a specific date and takes the
arguments ( serial_number , return_type ). The serial_number argument can be a serial date value,
a reference to a cell that contains either a date function or a serial date value, or text such
as 1/27/14 or January 27, 2014. If you use text, be sure to enclose the text in quotation
marks. The function returns a number that represents the day of the week on which the
specified date falls. The optional return_type argument determines the way the result is
displayed. Table 15-2 lists the available return types.
TABLE 15-2 Return type codes
If return_type is WEEKDAY returns
1 or omitted
A number from 1 through 7, where 1 is Sunday and 7 is Saturday
A number from 1 through 7, where 1 is Monday and 7 is Sunday
A number from 0 through 6, where 0 is Monday and 6 is Sunday
You might want to format a cell containing the WEEKDAY function with a custom
dayof-the-week format, such as dddd. By applying this custom format, you can use the
result of the WEEKDAY function in other functions and still have a meaningful display
on the screen.
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