Applied patch by Ron Mayer <rm_pg@cheapcomplexdevices.com> to merge the new

src/interfaces/ecpg/ChangeLog

src/interfaces/ecpg/pgtypeslib/dt.h

src/interfaces/ecpg/pgtypeslib/interval.c

src/interfaces/ecpg/test/expected/pgtypeslib-dt_test.c

src/interfaces/ecpg/test/expected/pgtypeslib-dt_test.stderr

src/interfaces/ecpg/test/pgtypeslib/dt_test.pgc