Sub for performing a function across multiple worksheets

The sub below executes a Text to Columns function on the active sheet (eg January) but how would I get this to perform the same function simultaneously across three or more specified worksheets eg January but also the February and March worksheets?

   
Sub Calc_WS() Columns("G:G").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, 1), TrailingMinusNumbers:=True
End Sub

Thanks