The date and time reported in ISA logs may appear to be off
by several hours even though the system time, date, and Greenwich Mean Time
(GMT) offset are correctly configured.
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All logs generated by an ISA server list the date and time
in GMT, not local time. This is different from Microsoft Internet Information
Server (IIS) versions 1.0 through 3.0, which log in local time.
Also,
note that the date format (YYYY-MM-DD) is universal and is not affected by
regional settings (unlike IIS), which makes parsing for non-United States logs
easier. This also means that daily log rollovers happen at midnight GMT, which
could be late afternoon for most U.S. locations.
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