be the Gregorian calendar.
.TP
\fB%EC\fR
On output, produces a locale-dependent name of an era in the locale's
alternative calendar.  On input, matches the name of the era or any
unique prefix.
.TP
\fB%EE\fR
On output, produces the string \fBB.C.E.\fR or \fBC.E.\fR, or a
string of the same meaning in the locale, to indicate whether \fB%Y\fR refers
to years before or after Year 1 of the Common Era.  On input, accepts
the string \fBB.C.E.\fR, \fBB.C.\fR, \fBC.E.\fR, \fBA.D.\fR, or the
abbreviation appropriate to the current locale, and uses it to fix
whether \fB%Y\fR refers to years before or after Year 1 of the 
Common Era.
.TP
\fB%Ex\fR
On output, produces a locale-dependent representation of the date
in the locale's alternative calendar.  On input, matches
whatever %Ex produces.  The locale's alternative calendar need not
be the Gregorian calendar.
.TP
\fB%EX\fR