Implementation Details
New command-line option for configuration:

--logTimestampFormat=(ctime|iso8601-utc|iso8601-local)

The beginning of the Unix Epoch is formatted as follows in the three formats, assuming America/New_York for the time zone.

ctime:         Wed Dec 31 19:00:00.000
iso8601-utc:   1970-01-01T00:00:00.000Z
iso8601-local: 1969-12-31T19:00:00.000+0500

Original description
Log parsing with date ranges can be tricky without a year in the timestamp by default, especially near the end/start of the year.

Rather than the current:

Thu Dec 13 16:39:15 [log message]

Perhaps:

Thu Dec 13 2012 16:39:15 [log message]