thread order (when old threads are moved) ?

[kurti]

hi,
i'm restructuring my forum with new categories and forums.
for example i'm getting rid of one forum...
and i want to move all the threads into other forum sections.

when i do that the threads always seem to appear on top
of the new threads in the destination forum...
even if their date is way older.

is there a way to make threads reorder automaticly by date/time?

i've tried "Rebuild Thread Information" & "Rebuild Forum Information"
but this doesnt seem to have an effect on the order.