Returns true if the two xs:gDay values have the same starting instant, when
considered as days in the same month of the same year.
xs:gDay values. Also used in the
definition of the "ne" operator.op:gDay-equal( $arg1 as xs:gDay,$arg2 as xs:gDayxs:booleanThe starting instants of $arg1 and $arg2 are calculated by
supplying the missing components of $arg1 and $arg2 from the
xs:dateTime template 1972-12-xxT00:00:00 or an equivalent.
The function returns the result of comparing these two starting instants using
op:dateTime-equal.
Assume that the dynamic context provides an implicit timezone value of
-05:00. Assume, also, that the xs:dateTime template is
1972-12-xxT00:00:00.
The expression op:gDay-equal(xs:gDay("---25-14:00"),
xs:gDay("---25+10:00")) returns false().
The expression op:gDay-equal(xs:gDay("---12"), xs:gDay("---12Z")) returns false().
