+
+@item EPOCH
+@anchor{SET EPOCH}
+Specifies the range of years used when a 2-digit year is read from a
+data file or used in a date construction expression (@pxref{Date
+Construction}). If a 4-digit year is specified, then 2-digit years
+are interpreted starting from that year, known as the epoch. If
+AUTOMATIC (the default) is specified, then the epoch begins 69 years
+before the current date.