A search in the webapps that allows for a date criteria, e.g. the operation log in Admin.
I choose to limit the results to be before a specific date (and I cannot choose the seconds myself), e.g. limiting the timestamp in the operation log in Admin.
The timestamp that is send to the server as criteria contains the seconds from the point in time I created the criterion.
This can lead to different results for the user depending on when the criteria is created, although the criteria looks the same to the user but in fact isn't.