It has always been the 24th. In an earlier video I messed up the date, I believe in the pre-announcement video I mentioned but I corrected that.
See in the announcement video. It says the 24th 2017
'The confusion probably comes from the Overview, where you say:
'In my pre-jam video I mentioned that the jam will end on the 28th, however this does not give people enough time to vote. We will be ending this jam on the 26th and voting will end on the 30th. The spotlight video can then go up on the 31st.'
Obviously a typo. I hadn't actually paid attention to that and was going by the countdown timer, until I read this thread. :)