Hello, Ramesh
To restrict the Date Format in DD.MM.YYYY, you can apply the below code:
Note: Please change the cell reference B2:B12 to your own list of cell.

Private Sub Worksheet_Change(ByVal Target As Range)
'updateby Extendoffice
    On Error Resume Next
    
    Dim Bool As Boolean
    Dim Rg As Range
    Dim xRegEx As Object
    
    Bool = False

    Set Rg = Application.Intersect(Target, ActiveSheet.Range("B2:B12"))
    If Rg Is Nothing Then Exit Sub

    Set xRegEx = CreateObject("VBSCRIPT.REGEXP")
    With xRegEx
        .Pattern = "^[0-3]\d\.[0-1][0-2]\.\d{4}$"
        .Global = True
        .IgnoreCase = True
    End With
    
    Application.EnableEvents = False
    For Each c In Target
        If c.Value <> "" Then
            If Not xRegEx.test(c.Text) Then
                c.ClearContents
                Bool = True
            End If
        End If
    Next c
    Application.EnableEvents = True
    If Bool Then
        MsgBox "Error date format."
    End If
End Sub

Please have a try, hope it can help you!

Hello, Roberto,

To only allow time format to be entered, you should apply the below code:



Private Sub Worksheet_Change(ByVal Target As Range)

'updateby Extendoffice

Dim xArr As Variant

Dim xF As Integer

Dim xB As Boolean

Dim xWRg, xCRg As Range

Set xWRg = ActiveSheet.Range("B2:B20")

For Each xCRg In xWRg

xArr = Split(xCRg.Value, ":")

xB = False

If UBound(xArr) <= 2 Then

For xF = LBound(xArr) To UBound(xArr)

If IsNumeric(xArr(xF)) Then

If xF = 0 Then

If (xArr(xF) > 0) And (xArr(xF) < 24) Then

Else

xB = True

GoTo BTime

End If

Else

If (xArr(xF) > 0) And (xArr(xF) < 60) Then

Else

xB = True

GoTo BTime

End If

End If

Else

xB = True

GoTo BTime

End If

Next

Else

MsgBox "Only a time format is permitted in this cell."

xCRg.ClearContents

End If

BTime:

If xB Then

MsgBox "Only a time format is permitted in this cell."

xCRg.ClearContents

End If

Next xCRg

End Sub



Please try it, thank you!

Hello, Kevin,
To make the code applied for multiple ranges, you just need to add the cell references into the code as below:

Private Sub Worksheet_Change(ByVal Target As Range)
Set w = ActiveSheet.Range("B2:B12,A1:A10,C5:C20")
For Each c In w
If c.Value <> "" And Not IsDate(c) Then
c.ClearContents
MsgBox "Only a date format is permitted in this cell."
End If
Next c
End Sub

Please try, hope it can help you!