Here is the code-
' you can add this code in workbook open module.
Sub tests()
Dim i As Long
For i = 2 To Sheets(1).Range("a1").End(xlDown).Row
If Day(CDate(Sheets(1).Range("c" & i).Value)) - Day(Now) = 1 And Month(CDate(Sheets(1).Range("c" & i).Value)) - Month(Now) = 0 Then
MsgBox "Employee Name --> " & Sheets(1).Range("b" & i).Value & " is having b'day tomorrow"
End If
Next i
End Sub
Download Excel Macro File http://www.filefactory.com/file/cc92d19/n/b_day_alerts.xlsm