I receive the following when I attempt to crosspost all entries to Livejournal:
ERROR MESSAGE: Something went wrong - 153 : Incorrect time value: You have an entry which was posted at 2011-04-01 00:00, but you're trying to post an entry before this. Please check the date and time of both entries. If the other entry is set in the future on purpose, edit that entry to use the "Date Out of Order" option. Otherwise, use the "Date Out of Order" option for this entry instead.
Livejournal Help Reference: