Time.EndOfHour Function in Power Query
The Time.EndOfHour function in Power Query returns the end of the hour.
Syntax
 Time.EndOfHour(dateTime as any) as any 
The parameter dateTime as any specifies the time value. It returns is a time value.
Example:
Power Query M
let
    Source = Time.EndOfHour(#time(20, 54, 25))
in
    Source    The output of the above code is 20:59:59.9999999.