There are several formats that logs can exist in depending on the system in question and configurations as well.
- W3C. ASCII, UTC.
- IIS. ASCII, local time.
- NCSA. ASCII, no customization, local time
- IIS ODBC. Needs to be enabled first, degrades performance.
- BIN. IIS 5.1+, in binary format, logging several websites at once.
- XML. Mostly used for applications to share data.
access.log.
Using pivot tables may help. Apache has an access.log.