If you type -1 into the from date field in a bugzilla search, you get an internal Server Error. It worked before the upgrade.
I never used this one, what did it do? Is it the same as "1d"?
It allowed you to query bugs changed since 1 day prior to the second date field. It's not a huge deal, as I used it just to see what bugs had changed in the last day, and realized I can type in "Yesterday" instead.