Hi Erel,
There are 3 dates:
One is a text string of the date - I think set by the receiving centre/relay station.
The second, sent date and time are only logged if the SMS is incoming (i.e. the time that someone sent the message to you)
The third one is the time that the message is delivered at the destination phone only logged if SMS is outgoing.
The last two date/time's are based on the 1/1/1970 numbers so need to be calculated. These two times are based on the time's that are set on each or the user's telephones I think - saw variances on actual messages.
Example of exported data:
3704 - Incoming, 3699 - Outgoing
_id,thread_id,address,person,date,date_sent,protocol,read,status,type,reply_path_present,subject,body,service_center,locked,error_code,seen,deletable,sim_slot,sim_imsi,hidden,group_id,group_type,delivery_date,app_id,msg_id,callback_number,reserved,pri,teleservice_id,link_url,svc_cmd,svc_cmd_content,roam_pending,spam_report,safe_message,
"3704","15","+447894561234","","Fri Jan 09 11:43:22 GMT+00:00 2015","1420803821000","0","1","-1","1","0","","Got ya message see you soon","+447802001234","0","0","1","0","0","","0","","","","0","0","","0","0","0","","0","","0","0","0"
"3699","16","+447749981234","","Thu Jan 08 19:32:13 GMT+00:00 2015","0","","1","0","2","","","First of night.","","0","0","1","0","0","","0","","","1420745543860","0","0","","0","0","0","","0","","0","0","0"
I am not sure if this is of any help????