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23_044039 ch18.qxp 11/21/06 11:09 AM Page 348
Part II
Working with Formulas and Functions
This workbook is available on the companion CD-ROM. The file is named array formula
ON the CD-ROM
ON the CD-ROM
calendar.xlsx.
To create this calendar in the range B2:H9, follow these steps:
1. Select B2:H2 and merge the cells by choosing Home ➪ Alignment ➪ Merge & Center.
2. Enter a date into the merged range. The day of the month isn’t important.
3. Enter the abbreviated day names in the range B3:H3.
4. Select B4:H9 and enter this array formula. Remember, to enter an array formula, use
Ctrl+Shift+Enter (not just Enter).
{=IF(MONTH(DATE(YEAR(B2),MONTH(B2),1))<>MONTH(DATE(YEAR(B2),
MONTH(B2),1)-(WEEKDAY(DATE(YEAR(B2),MONTH(B2),1))-1)+
{0;1;2;3;4;5}*7+{1,2,3,4,5,6,7}-1),””,
DATE(YEAR(B2),MONTH(B2),1)-(WEEKDAY(DATE(YEAR(B2),MONTH(B2),1))-1)+
{0;1;2;3;4;5}*7+{1,2,3,4,5,6,7}-1)}
5. Format the range B4:H9 to use this custom number format: d. This step formats the dates to
show only the day. Use the Custom category in the Number tab of the Format Cells dialog box to
specify this custom number format.
6. Adjust the column widths and format the cells as you like.
Change the month and year in cell B2, and the calendar will update automatically. After creating this calen-
dar, you can copy the range to any other worksheet or workbook.
FIGURE 18.11
Displaying a calendar by using a single array formula.

The array formula actually returns date values, but the cells are formatted to display only the day portion of
the date. Also, notice that the array formula uses array constants.
CROSS-REF See Chapter 17 for more information about array constants.
CROSS-REF

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