Just got on the site on my computer and sorting votes by dates. The default page is 10 posts starting from 21st June 2017 (wow! such a long time ago),
If I click on date sort, this is what I see. The dates looks a bit random?
But data filter would definitely be great. Thanks!!
Just looked at this and not sure why this sorting isnt working for you, but I will put in some date filters and a download button which will help too
In the meantime if you try sorting by the timestamp column you might have more luck.
Just made some updates so let me know if that works better.