Have you considered setting deadlines on key tasks? Deadlines are always as of the default end time of a day. So, in your scenario above the task would still be meeting the deadline (although there is finish variance). Tasks are flagged in the indicator column if you are scheduled to miss a deadline.

If you wish to test variance for every task, the formula below should work:

In a Flag field:

DateValue([Baseline Finish])-DateValue([Finish])>=1

will show "yes" for any task that does not have the same date value finish as the date value baseline finish.

Thanks so much Julie. You always get me on track.