Excel is a powerful tool for organizing and analyzing data. One of the many useful functions that Excel offers is the NOW function. This function returns the current date and time as a date-time value. In this article, we will show you how to use the NOW function in Excel to update a cell only when a specific cell changes.
Understanding the NOW Function
The NOW function in Excel returns the current date and time as a date-time value. The syntax for the NOW function is:
NOW()
When you use the NOW function in a cell, it will return the current date and time as a date-time value. For example, if you use the formula:
=NOW()
In a cell, it will return a value that looks something like this:
44342.5546796875
This value represents the current date and time. The integer part of the value is the number of days since January 1, 1900, and the decimal part of the value is the time in days. You can format this value as a date and time using the format cells option in Excel.
Using the NOW Function to Update a Cell Only When a Specific Cell Changes
One of the useful features of the NOW function is that it can be used to update a cell only when a specific cell changes. This can be done using the Worksheet_Change event in Excel VBA. The Worksheet_Change event is triggered when a cell on a worksheet is changed by the user or by a macro. By using this event, we can make Excel update the cell that contains the NOW function only when the specific cell that we want to monitor changes.
Here's an example of how to use the NOW function in Excel to update a cell only when a specific cell changes:
- Open a new or existing Excel workbook.
- Press Alt + F11 to open the Visual Basic Editor.
- In the Visual Basic Editor, right-click on the worksheet that you want to use and select View Code.
- In the code editor, enter the following code:
Private Sub Worksheet\_Change(ByVal Target As Range)
If Not Intersect(Target, Range("A1")) Is Nothing Then
Range("B1").Value = Now
End If
End Sub
In this example, the code is set up to monitor cell A1. When cell A1 is changed, the code will update cell B1 with the current date and time. You can change the cell that is being monitored by changing the range in the Intersect function. For example, if you want to monitor cell C3, you would change the range to:
If Not Intersect(Target, Range("C3")) Is Nothing Then
Once you have entered the code, you can close the Visual Basic Editor and return to the worksheet. Now, when you change the value in cell A1, cell B1 will be updated with the current date and time.
The NOW function in Excel is a powerful tool for returning the current date and time as a date-time value. By using the Worksheet_Change event in Excel VBA, you can use the NOW function to update a cell only when a specific cell changes. This can be useful in a variety of situations, such as tracking changes to a worksheet or monitoring the status of a project. With a little bit of VBA knowledge, you can take advantage of the NOW function and other Excel functions to automate your work and save time.
References
| Title | Author | Publication Date |
|---|---|---|
| NOW Function | Microsoft Support | November 2, 2021 |
| Excel VBA Events | Excel Easy | November 2, 2021 |