As per draft-ietf-drums-msg-fmt,
Handling of 2-digit years in the Date fields is:
If a two digit year is encountered whose value
is between 00 and 49, the year is interpreted by adding 2000, ending up
with a value between 2000 and 2049. If a two digit year is encountered
with a value between 50 and 99, or any three digit year is encountered,
the year is interpreted by adding 1900.
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However, this does not follow the X/Open recommendation of using '68' as the
rollover number.
From: http://www.UNIX-systems.org/version2/whatsnew/year2000.html
Define yy such that if century is not specified, then values in the range
[69-99] refer to years in the twentieth century (1969 to
1999 inclusive), and values in the range [00-68] refer to years in the
twenty-first century (2000 to 2068 inclusive).
Comments ?
-john