ActiveCell.EntireColumn.Select
Selection.TextToColumns Destination:=Range("G1"), DataType:=xlDelimited, _
TextQualifier:=xlDoubleQuote, ConsecutiveDelimiter:=False, Tab:=True, _
Semicolon:=False, Comma:=False, Space:=False, Other:=False, FieldInfo _
:=Array(1, 4), TrailingMinusNumbers:=True
Selection.NumberFormat = "dd-mmm-yy"
I found the solution , Thanks for support , Modified code should be
ActiveCell.EntireColumn.Select
Dim myRange As Range
Set myRange = Selection
myRange.TextToColumns Destination:=myRange, DataType:=xlDelimited, _
TextQualifier:=xlDoubleQuote, ConsecutiveDelimiter:=False, Tab:=True, _
Semicolon:=False, Comma:=False, Space:=False, Other:=False, FieldInfo _
:=Array(1, 4), TrailingMinusNumbers:=True
Selection.NumberFormat = "dd-mmm-yy"