The timestamps in file names are used by the auditreduce command to locate records within a specific time range. These timestamps are important because there can be a month's accumulation or more of audit files online. To search all the files for records that were generated in the last 24 hours would be unacceptably expensive.
The start-time and end-time are timestamps with one-second resolution. They are specified in Greenwich Mean Time (GMT). The format is four digits for the year, followed by two digits for each month, day, hour, minute, and second, as follows:
The timestamps are in GMT to ensure that they sort in proper order, even across time zones. Because they are in GMT, the date and hour must be translated to the current time zone to be meaningful. Beware of this point whenever you manipulate these files with standard file commands rather than with the auditreduce command.