ashish-kumar-sharma commented on a change in pull request #2409:
URL: https://github.com/apache/hive/pull/2409#discussion_r656846147



##########
File path: ql/src/test/queries/clientpositive/udf_date_format.q
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@@ -78,3 +78,16 @@ select date_format("2015-04-08 10:30:45","yyyy-MM-dd 
HH:mm:ss.SSS z");
 --julian date
 set hive.local.time.zone=UTC;
 select date_format("1001-01-05","dd---MM--yyyy");
+
+--dates prior to 1900
+set hive.local.time.zone=Asia/Bangkok;
+select date_format('1400-01-14 01:01:10.123', 'yyyy-MM-dd HH:mm:ss.SSS z');
+select date_format('1800-01-14 01:01:10.123', 'yyyy-MM-dd HH:mm:ss.SSS z');
+
+set hive.local.time.zone=Europe/Berlin;
+select date_format('1400-01-14 01:01:10.123', 'yyyy-MM-dd HH:mm:ss.SSS z');
+select date_format('1800-01-14 01:01:10.123', 'yyyy-MM-dd HH:mm:ss.SSS z');
+
+set hive.local.time.zone=Africa/Johannesburg;
+select date_format('1400-01-14 01:01:10.123', 'yyyy-MM-dd HH:mm:ss.SSS z');

Review comment:
       +1 to @sankarh comments. Existing test cases are fine. Could please add 
some more time zone based test cases. 




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