true
if the first datetime is the same or before the second datetime, otherwise returns false
.DATETIME_IS_SAME_OR_BEFORE("2011-10-10T12:13:14Z", "2011-10-09T12:13:14Z")
false
DATETIME_IS_SAME_OR_BEFORE("2011-10-09T12:13:14Z", "2011-10-10T12:13:14Z")
true
DATETIME_IS_SAME_OR_BEFORE("2011-10-10T12:13:14Z", "2011-10-10T12:13:14Z")
true
DATETIME_IS_SAME_OR_BEFORE("2012-10-10T12:13:14Z", "2011-10-09T12:13:14Z", "year")
false