Date Banding

Please refer to:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("Tc7BDcAwCAPAXfKupZoobZglyv5rlPRjP0/YwFot7uggord9/QoMPMJECpUTKuidKbzeSZ8kaGLoEms5hUAXhsfsIZ599cT+AA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Actual End Date" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Actual End Date", type date}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each DateTime.Date(DateTime.FixedLocalNow() )),
    #"Added Custom1" = Table.AddColumn(#"Added Custom", "Custom.1", each ((Date.Year([Actual End Date])-Date.Year([Custom]))*12) + Date.Month([Actual End Date]) - Date.Month([Custom])),
    #"Added Conditional Column" = Table.AddColumn(#"Added Custom1", "Custom.2", each if [Custom.1] <= 0 then "Expired" else if [Custom.1] <= 2 then "0-3mths" else if [Custom.1] <= 5 then "3-6mths" else if [Custom.1] <= 11 then "6-12mths" else if [Custom.1] <= 17 then "12-18mths" else if [Custom.1] <= 23 then "18-24mths" else "24mths+"),
    #"Sorted Rows" = Table.Sort(#"Added Conditional Column",{{"Actual End Date", Order.Ascending}}),
    #"Removed Columns" = Table.RemoveColumns(#"Sorted Rows",{"Custom", "Custom.1"})
in
    #"Removed Columns"