postDate keeps jumping ahead when editing an entry When I edit an existing entry the post date jumps ahead by an hour meaning I have to manually remove it before saving the changes.

I thought it may have something to do with the timezone but this is set to the correct timezone.

Has anyone come across this?
Adding as an official answer since we've had a handful of reports about this.  Best we can tell it's a bug in Firefox that happens when you live in a non-UTC timezone.  There are several Date related bugs in Mozilla's bug tracker, but this one looks to be the most relevant: https://bugzilla.mozilla.org/show_bug.cgi?id=1227499