Each line of an access log file begins with a timestamp of this format:[20/Dec/2006:11:39:51 -0700]. The time stamp, -0700 indicates the time difference in relation to GMT.
The format of the time stamp can vary according to your platform. The connection, closed, and abandon records appear individually. All other records appear in pairs, consisting of a request for service record followed by a result record. The record pairs usually, but not exclusively, appear on adjacent lines.