When running reminder reports under Mail you're given the option to "record mailing in each gifts reminder history". This is very helpful to record when reminders are run and sent. Unfortunately, if you accidentally run something at the wrong time and don't send it out, it would be nice to have the option to remove or at least note or amend the history.
and here is another request for the same issue: https://re7.ideas.aha.io/ideas/RE7-I-247
I just requested this update as well. https://re7.ideas.aha.io/ideas/RE7-I-4642
Allie, please search for the post on this topic and add your vote there. At some point in the future BB may combine the ideas but more votes on the post about editing/correct date on reminder history will carry more weight for a possible change. :)