Invalid Time message


I receive feeds on my website fine, when I share a picture or something it works fine. However when I attempt to post from the embedded twitter feed I get an invalid time message. Other occasions it works fine, or the message posted will show up hours later. I can not offer this service to the members on my site if the problems persists. You know how intolerant people can be when something doesn’t function correctly. Any ideas on this issue, as I am at a loss to explain or rectify these inconsistencies.
Best Regards