Timestamps

If values are sent using zabbix_sender from a file with timestamps, then these timestamps will be adjusted to match server time. For instance, if an item's timestamp is “10:30:50”, the current time on zabbix_sender's machine is “10:40:03”, and the current time on Zabbix server's machine is “10:40:05”, then the item's value will be stored in the database with a timestamp of “10:30:52”.

#here are some descriptions hard to understand.
#why the last timestamp stored in database is “10:30:52”?