Log Message:
-----------
Improve documentation about Julian dates; in particular, point out the
difference between Julian and Gregorian reckoning of when JD 0 was.
Modified Files:
--------------
pgsql/doc/src/sgml:
datetime.sgml (r2.57 -> r2.58)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/datetime.sgml?r1=2.57&r2=2.58)
func.sgml (r1.417 -> r1.418)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml?r1=1.417&r2=1.418)