Change datetime column value conditionally without creating new columns.

Hi,

I am trying to change the value of a datetime column based on certain conditions. Is it possible to do so without having to create new columns.

I have tried the following using the pattern for changing a text column value conditionally on a another column.

Table.ReplaceValue(#"LastEditDate",
each [LasteditDate],
each if Time.Hour([LasteditDate]) = 21 then [LasteditDate] + #duration(0,1,31,0) else [LastEditDate]
, Replacer.ReplaceValue
, {"LastEditDate"}
)

Thank you