... I hear you asking.
Well, it's like this: Sometimes I don't quite finish a post the day I intend to publish it, due to distraction or not feeling well or having to tend to responsibilities or just running out of time.
And because I can backdate a post, I do. It doesn't make sense to have a Monday Gunday appear on a Tuesday, now does it?
Basically, it's for archival purposes and to appease my OCD.