olivrlee commented on code in PR #3023:
URL: https://github.com/apache/calcite/pull/3023#discussion_r1072911432
##########
babel/src/test/resources/sql/big-query.iq:
##########
@@ -1097,12 +1097,74 @@ select unix_date(datetime '2008-12-25') as d;
#
# Return Data Type: DATE
-select date(2022, 11, 15) as d;
-+------------+
-| d |
-+------------+
-| 2022-11-15 |
-+------------+
+select date(2022, 11, 15) as d1,
+ date(datetime "2008-01-01 01:03:05") as d2,
+ date(datetime(2008, 1, 1, 1, 3, 5)) as d3;
++------------+------------+------------+
+| d1 | d2 | d3 |
++------------+------------+------------+
+| 2022-11-15 | 2008-01-01 | 2008-01-01 |
++------------+------------+------------+
+(1 row)
+
+!ok
+
+# Test timezone conversion when converting TIMESTAMP to DATE.
+# Denver observes DST whereas Phoenix does not.
+# Both cities have a -07:00 offset in winter, but Denver has -06:00 in summer.
+select date(timestamp("2008-06-21 06:30:00")) as sum_utc,
+ date(timestamp("2008-06-21 06:30:00"), "America/Denver") as sum_dst,
+ date(timestamp("2008-06-21 06:30:00"), "America/Phoenix") as sum_std,
+ date(timestamp("2008-12-21 06:30:00")) as win_utc,
+ date(timestamp("2008-12-21 06:30:00"), "America/Denver") as win_dst,
+ date(timestamp("2008-12-21 06:30:00"), "America/Phoenix") as win_std;
++------------+------------+------------+------------+------------+------------+
+| sum_utc | sum_dst | sum_std | win_utc | win_dst | win_std |
++------------+------------+------------+------------+------------+------------+
+| 2008-06-21 | 2008-06-21 | 2008-06-20 | 2008-12-21 | 2008-12-20 | 2008-12-20 |
++------------+------------+------------+------------+------------+------------+
+(1 row)
+
+!ok
+
+#####################################################################
+# DATETIME
Review Comment:
there's a set of DATETIME tests currently disabled around line 650 btw
https://github.com/apache/calcite/blob/6e5b2f22414b1c1617d0e721d6dcf93f1b82d673/babel/src/test/resources/sql/big-query.iq#L649
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