DateTime.IsInCurrentSecond Function in Power Query
The DateTime.IsInCurrentSecond function in Power Query indicates whether the given datetime value occurs during the current second, as determined by the current date and time on the system.
Syntax
 DateTime.IsInCurrentSecond(dateTime as any) as nullable logical 
- dateTime: A datetime, or datetimezone value to be evaluated.
 
Example:
Power Query M
let
    Source = DateTime.IsInCurrentSecond(DateTime.FixedLocalNow())
in
    Source          The output of the above code TRUE.