I recently did a double import (Vanilla 2 >SMF 2.0 >xF 1.5) and have successfully made it to xF! However, when importing from SMF 2.0 I noticed a hand full of threads that didn't make it over. Upon looking into it further I realized they never made it to SMF from Vanilla. So obviously this isn't an issue with your importer, but with SMF's.
What I'm wondering is if I go in and manually re-create these threads, can I modify the author/creation date? I still have access to my original forums so it would be simple to copy paste all of the threads and comments. I just need to be able to edit the author's/dates.
I see when looking at my tables in phpMyAdmin there is one called 'xf_thread' and one called 'xf_post'. It appears that these are the two tables I need to modify; theoretically couldn't I export the tables, modify two fields (username and post_date) and then re-import the two tables?
If so, the only issue I have is that the post date is just a large number, so I have no idea what value I need to input that will reflect the correct date. For example, a post I posted at 12:01 this morning shows the following number: 1445295716. And a post posted in the same forum at 4:52 this morning shows the following number: 1445313165. Can anyone assist me here?