TF = ne (A, B) is the equivalent of the syntax TF = A != B and returns a logical array set to true where the corresponding elements of A and B are not the same point in time, and false otherwise.

Both operands must be datetime arrays and either both have a time zone or both be unzoned; zoned arrays are compared by their absolute instants, so the two time zones may differ. A and B must be size compatible. Not-A-Time is never equal to anything, so it compares as true against everything, including another Not-A-Time, just like NaN.

Source Code: datetime