Enter the following event macro in the worksheet code area:
Private Sub Worksheet_Change(ByVal Target As Range)
Set a1 = Range("A1")
If Intersect(Target, a1) Is Nothing Then Exit Sub
Application.EnableEvents = False
Dim s1 As Worksheet, s2 As Worksheet
Set s1 = Sheets("Sheet1")
Set s2 = Sheets("Sheet2")
s2.Cells.Clear
k = 1
n = Cells(Rows.Count, "A").End(xlUp).Row
v = a1.Value
For i = 1 To n
If Month(Cells(i, 1).Value) = v Then
Cells(i, 1).EntireRow.Copy s2.Cells(k, 1)
k = k + 1
End If
Next
Application.EnableEvents = True
End Sub
After the installation, type a month (as a number) in A1 (4 for March) and
the March data will be copied to Sheet2.
Type a new value, and the data on Sheet2 will be refreshed.
Because it is worksheet code, it is very easy to install and use:
1. right-click the tab name near the bottom of the window
2. select View Code - this brings up a VBE window
3. paste the stuff in and close the VBE window
If you save the workbook, the macro will be saved with it.
To remove the macro:
1. bring up the VBE windows as above
2. clear the code out
3. close the VBE window
To learn more about macros in general, see:
http://www.mvps.org/dmcritchie/excel/getstarted.htm
To learn more about Event Macros (worksheet code), see:
http://www.mvps.org/dmcritchie/excel/event.htm