Merge branch 'bug/80'

* bug/80:
  fix, use dt_io_clear_zones() in all tools, fixes issue #80
  test, provide regression case for issue #80

Author: hroptatyr

src/dtest.c

@@ -142,9 +142,7 @@ main(int argc, char *argv[])
 		res = res == 1 || res == 0 ? 0 : 1;
 	}
 out:
-	if (fromz != NULL) {
-		zif_close(fromz);
-	}
+	dt_io_clear_zones();
 	if (argi->from_locale_arg) {
 		setilocale(NULL);
 	}

src/dzone.c

@@ -362,9 +362,6 @@ nor a date/time corresponding to the given input formats", inp);
 		free(d);
 	}
 
-	if (fromz != NULL) {
-		zif_close(fromz);
-	}
 	if (argi->from_locale_arg) {
 		setilocale(NULL);
 	}

test/Makefile.am

@@ -864,6 +864,7 @@ dt_tests += dzone.010.clit
 dt_tests += dzone.011.clit
 dt_tests += dzone.012.clit
 dt_tests += dzone.013.clit
+dt_tests += dzone.014.clit
 
 dt_tests += dsort.001.clit
 dt_tests += dsort.002.clit

test/dzone.014.clit

@@ -0,0 +1,14 @@
+#!/usr/bin/clitoris  ## -*- shell-script -*-
+
+## this is issue #80
+$ dzone --input-format='%m/%d/%Y,%H:%M' --from-zone='America/New_York' UTC '03/14/2017,11:30'
+2017-03-14T15:30:00+00:00	UTC
+$ dzone --input-format='%m/%d/%Y,%H:%M' --from-zone='America/New_York' '03/14/2017,11:30'
+2017-03-14T15:30:00-04:00
+$ dzone --input-format='%m/%d/%Y,%H:%M' UTC '03/14/2017,11:30'
+2017-03-14T11:30:00+00:00	UTC
+$ dzone --input-format='%m/%d/%Y,%H:%M' '03/14/2017,11:30'
+2017-03-14T11:30:00+00:00
+$
+
+## dzone.014.clit ends here