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Part 4 Advanced VBA
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Microsoft Office Excel 2003 Programming Inside Out Now is not the only date or time function available to you in Excel VBA. Table 9-5 lists the functions available to you and describes them.
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Table 9-5.
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Useful Functions for Finding All or Part of a Date or Time
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Returns the current date. Returns the current time. Returns the current date and time. Returns the number of seconds since midnight. Given a character string, such as "August 2, 2004", returns a date (for example, 8/2/2004). Given a character string, such as "19:30", returns a time (for example, 7:30:00 P .M.) Given a year, month, and day (for example, DateSe rial(2004, 8, 2) returns the date (8/2/2004).
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Date Time Now Timer DateValue TimeValue DateSerial (year, month, day)
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TimeSerial (hour, minute, second) Given an hour, minute, and second, (for example, TimeSerial(19, 30, 24), returns the time (7:30:24 PM). Hour, Minute, Second Year, Month, Day Weekday MonthName Given a time, returns the hour, minute, or second com ponent of that time. Given a date, returns the year, month, or day compo nent of that date. Given a date, returns the weekday (Sunday = 1, Mon day = 2, and so on) of that date. Given an integer, returns the month corresponding to that integer (for example, 8 returns August).
With the exception of the Weekday and MonthName functions, writing the result of any of the mentioned date and time functions to a worksheet cell means that Excel will format the cell with its default Date format. There are a number of other date-related and time-related functions that you can use to perform calculations in your Excel VBA code. The two most useful functions are DateAdd and DateDiff. DateAdd, as the name implies, lets you add a time period to a date or time. Yes, you can add three days to a date with simple addition, as in the following procedure:
Public Sub AddDays() Dim datFirst, datSecond As Date
datFirst = #1/9/2004#
datSecond = datFirst + 3
MsgBox ("The new date is: " & datSecond & ".")
End Sub
Part 4: Advanced VBA
Manipulating Data with VBA But what if you want to add a month to datFirst Depending on the month, you would need to add either 28, 30, or 31 days. The DateAdd procedure lets you add a variety of time incre ments to a date or time through the use of an ingenious syntax
DateAdd("interval", number, date)
in which interval is the code (in quotes) of the time unit, number is the number of times to increment the date or time by the interval, and date is the date or time to which you want to add the time. Table 9-6 lists the available units and their corresponding codes.
Table 9-6.
Codes for Intervals Used in the DateAdd Function
Code
Year Quarter (three months) Month Week Day of year Day Weekday Hour Minute Seconds
9
Unit
yyyy q m ww y d W h n s
For example, if you wanted to use a message box to display the date nine weeks from today, you would use the following function:
MsgBox (DateAdd("ww", 9, DATE))
You can also use negative values within the DateAdd function to move backward in time. For example, the function to return the time eight hours ago (reckoning from the current time on your computer clock) would be
DateAdd("h", -8, NOW)
Note You can also use negative values in the DateSerial and TimeSerial functions, described earlier, but the DateAdd function gives you more flexibility by letting you use different time units. The DateDiff function, as the name implies, lets you find the number of time units (that is, months, years, minutes, and so on) between two dates or times. The syntax is similar to that of the DateAdd function, but instead of using a base date and an increment to determine an end date, the DateDiff function uses two dates to determine the difference in interval between them. 215
Part 4 Advanced VBA
Microsoft Office Excel 2003 Programming Inside Out
DateDiff ("interval", date1, date2, firstdayofweek, firstweekofyear)
The arguments of the DateDiff function are listed in Table 9-7.
Table 9-7.
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