Geky - 2012-11-09

Could you please tell me what time is the "received" time based on?
my feeds are updated every minutes but the "received" time is different from my computer local time ("received" time is often anterior to the "creation" time)
For instance, a news was "received" at 09:19am but when it appeared, the local time (on my computer) was 09:30 am...

Thanks for your help.