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The VBA DateValue function is used to convert a given date string or value into a date serial number. This function is commonly used when working with dates in VBA and it is very useful for manipulating date values in a spreadsheet. It takes a date string in a specific format and returns a date serial number which can be formatted into a date format of your choice.

VBA DateValue Function – Purpose, Syntax and Arguments

Purpose:

The DateValue function is used to convert a given date string or value into a date serial number, which is a unique number used by Excel to represent a date. This function can be useful when working with Excel spreadsheets that have dates in string format, as it allows you to perform date calculations and manipulations on these strings. It also enables you to easily format the date serial number into a user-friendly date format.

Syntax:

DateValue(DateString)
  • DateString: Required. The date string or value which you want to convert into a date serial number.

Arguments:

  • DateString: The date string or value that you want to convert. This argument can be entered as a date string in any format recognized by your system’s regional settings, or as a date value enclosed in double quotes (#).

Example:

Sub Example_DateValue()
Dim dateString As String
Dim dateSerialNumber As Integer
'Assign a date string value to the dateString variable
dateString = "12/25/2021"
'Convert the dateString into a date serial number
dateSerialNumber = DateValue(dateString)
'Print the result using the MsgBox function
MsgBox "Date serial number for " & dateString & " is " & dateSerialNumber
End Sub

Remarks:

  • The DateValue function automatically converts two-digit years based on the system’s regional settings. In the United States, two-digit years are treated as years in the ranges 1930–2029.
  • If the date string cannot be recognized as a valid date, the function will return the #Value! error.

Important Notes:

  • The DateValue function only works on dates that fall between January 1, 100–December 31, 9999.
  • To avoid errors or unexpected results, it is recommended to always use four-digit years when working with the DateValue function.

In conclusion, the VBA DateValue function is a useful tool for converting date strings into date serial numbers that can be manipulated and formatted in Excel spreadsheets. Understanding its syntax, arguments, and important notes will help you effectively use this function in your VBA code.

Understanding VBA DateValue Function with Examples

VBA (Visual Basic for Applications) is a programming language that is used to automate tasks in Microsoft Office applications. It is widely used by businesses and professionals to enhance the functionality of their spreadsheets and streamline their workflows. One of the key functions in VBA is the DateValue function, which is used to convert a string into a date value. In this blog post, we will explore the DateValue function in detail and provide examples of how it can be used to manipulate dates in VBA.

Basic Syntax of DateValue Function

Sub DateValueExample1()
Dim dt As Date
Dim dateString As String
dateString = "12/31/2019"
dt = DateValue(dateString)
MsgBox "The date is " & dt
End Sub
  • The first line of code declares two variables: dt as a Date and dateString as a String
  • The next line assigns the string value “12/31/2019” to the dateString variable.
  • The third line uses the DateValue function to convert the string value into a date value and assign it to the dt variable.
  • In the fourth line, a message box is displayed to show the date value using the dt variable.

Explanation: In this example, we are using the DateValue function to convert a string value into a date value. The syntax of the DateValue function is DateValue(dateString), where dateString is the string that contains the desired date. The function then returns a date value that can be stored in a variable and used in other calculations or operations.

Handling Invalid Date Strings

Sub DateValueExample2()
Dim dt As Date
Dim dateString As String
dateString = "13/55/2019"
dt = DateValue(dateString)
MsgBox "The date is " & dt
End Sub
  • Similar to the previous example, the first two lines declare variables for the date and the string.
  • The third line assigns an invalid date string “13/55/2019” to the dateString variable.
  • The fourth line uses the DateValue function to convert the string value into a date value and assigns it to the dt variable.
  • In the fifth line, a message box is displayed with the value of the dt variable.

Explanation: In this example, we are using an invalid date string in the dateString variable. The expected result is a runtime error, as the string does not contain a valid date. The value assigned to the dt variable will be 0, which indicates an invalid date. This example highlights the importance of validating user input before using the DateValue function to avoid any runtime errors.

Converting Dates in Different Formats

Sub DateValueExample3()
Dim dt1 As Date
Dim dt2 As Date
Dim dt3 As Date
Dim dateString1 As String
Dim dateString2 As String
Dim dateString3 As String
dateString1 = "2019/12/31"
dateString2 = "12-31-2019"
dateString3 = "31 Dec 2019"
dt1 = DateValue(dateString1)
dt2 = DateValue(dateString2)
dt3 = DateValue(dateString3)
MsgBox "Date 1 is " & dt1
MsgBox "Date 2 is " & dt2
MsgBox "Date 3 is " & dt3
End Sub
  • In this example, we have declared six variables for storing three different date strings and their converted date values.
  • The next three lines assign the date strings in different formats to their respective variables.
  • The following three lines use the DateValue function to convert the strings into date values and store them in their corresponding variables.
  • In the last three lines, message boxes are displayed to show the converted date values.

Explanation: The DateValue function is not restricted to a particular date format. In this example, we have used three different formats to represent the date, i.e., YYYY/MM/DD (ISO format), MM-DD-YYYY, and DD Mon YYYY. The DateValue function can convert all these formats into a date value, which makes it a versatile tool for handling different date formats.

Using DateValue with Other Date Functions

Sub DateValueExample4()
Dim dt1 As Date
Dim dt2 As Date
Dim dt3 As Date
Dim dateString As String
dateString = "12/31/2019"
dt1 = DateValue(dateString)
dt2 = DateSerial(Year(dt1), Month(dt1) + 2, Day(dt1))
dt3 = DateAdd("d", 10, dt1)
MsgBox "Date 1 is " & dt1
MsgBox "Date 2 is " & dt2
MsgBox "Date 3 is " & dt3
End Sub
  • DateValue function can be combined with other date functions to perform more complex operations.
  • In this example, we have declared four variables to store the date values converted using the DateValue function and two other date functions.
  • The DateSerial function is used to add two months to the date value stored in the dt1 variable and assign it to dt2.
  • The DateAdd function is used to add 10 days to the date value stored in the dt1 variable and assign it to dt3.
  • Message boxes are displayed to show the results of the three date values.

Explanation: In this example, we have used the DateSerial function to add two months to the converted date value and DateAdd function to add 10 days to the converted date value. These functions are useful in scenarios where we need to manipulate dates based on specific criteria. By combining the DateValue function with these functions, we can perform more complex date operations in our VBA code.

Conclusion

The DateValue function is a powerful tool in VBA that allows us to convert string values into date values. It is a versatile function that can handle different date formats and can be used in conjunction with other date functions to perform advanced date operations. As demonstrated in the examples, the DateValue function is easy to use and can significantly enhance the functionality of VBA code. By understanding the DateValue function, you can efficiently work with dates in VBA and automate your tasks more effectively.

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Categories: VBA FunctionsTags: , , , Last Updated: September 30, 2023

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