I've imported a Drupal site to Wordpress with an archive of 1000s of posts which had been backdated by adding a custom taxonomy 'Year' rather than by adjusting the post date.
I've been able to remove this unneccessary taxonomy by bulk editing the post date on the using this method Bulk edit post date in wordpress
However, I now have many posts that were published at exactly the same date, hour and minute. This works fine for the archives, it doesn't work for the next/previous pagination, which skips over posts published at exactly the same time.
Any ideas how I could a) reset and randomise the post time of all posts, keeping the existing date? b) correct the pagination so it can somehow recognise posts published at the same time?