I have been using the XMLRPC api for a while to add emails to users Infusionsoft accounts. However it seems at some point that the date format for the API has change, since it no longer seems to recognize the date of the messages being added. They get the time correct, but all of the messages are shown as having an Invalid Date.
I have tried formats like this (previously used)
YYYY-MM-DD HH:MM:SS and
YYYY-MM-DDTHH:MM:SSZ but they both do the same thing.