chore: fix flaky datetime test (#17188)

Author: TCeason

tests/sqllogictests/suites/query/functions/02_0012_function_datetimes_tz.test

@@ -762,6 +762,11 @@ select to_date('1947-04-15 00:00:00')
 ----
 1947-04-15
 
+query T
+select to_date('1941-03-15 00:00:00')
+----
+1941-03-15
+
 query T
 select to_timestamp('1990-09-16 01:00:00');
 ----
@@ -852,6 +857,16 @@ set timezone='Asia/Shanghai';
 statement ok
 set enable_dst_hour_fix=1;
 
+query T
+select to_monday(to_date('1919-04-13','%Y-%m-%d'));
+----
+1919-04-07
+
+query T
+select to_year(to_date('1919-04-13','%Y-%m-%d'));
+----
+1919
+
 query T
 SELECT DATE_ADD(month, 1, '1941-03-15 00:00:00'::timestamp);
 ----
@@ -882,13 +897,12 @@ SELECT substr(DATE_ADD(month, 1, now())::String, 11)=substr(now()::String, 11);
 
 # format: 11
 query T
-SELECT substr(DATE_ADD(month, 1, now())::String, 6, 2) =
-CASE
-   WHEN substr(now()::String, 6, 2) = '12' THEN '01'
-   ELSE LPAD((substr(now()::String, 6, 2)::int + 1)::String, 2, '0')
-END;
+select sum( ((m1 + number) % 12 = m2 or ((m1 + number) % 12  + m2 = 12))::Int ) from (
+        select  number, DATE_ADD(month, number, now()) as d, to_month(now()) as m1, to_month(d) as m2
+        from numbers(1000)
+);
 ----
-1
+1000
 
 # format: 2024
 query T
@@ -947,13 +961,12 @@ SELECT substr(DATE_ADD(month, 1, now())::String, 11)=substr(now()::String, 11);
 
 # format: 11
 query T
-SELECT substr(DATE_ADD(month, 1, now())::String, 6, 2) =
-CASE
-   WHEN substr(now()::String, 6, 2) = '12' THEN '01'
-   ELSE LPAD((substr(now()::String, 6, 2)::int + 1)::String, 2, '0')
-END;
+select sum( ((m1 + number) % 12 = m2 or ((m1 + number) % 12  + m2 = 12))::Int ) from (
+        select  number, DATE_ADD(month, number, now()) as d, to_month(now()) as m1, to_month(d) as m2
+        from numbers(1000)
+);
 ----
-1
+1000
 
 # format: 2024
 query T
@@ -1066,3 +1079,43 @@ query T
 select to_start_of_day('2024-11-14 11:54:33.667269');
 ----
 2024-11-14 00:00:00.000000
+
+
+statement ok
+set enable_strict_datetime_parser = 0;
+
+query T
+select to_date('2017-5-23 0:00:00')
+----
+2017-05-23
+
+query T
+select to_date('2018-1-22')
+----
+2018-01-22
+
+query T
+select to_date('2021/10/14')
+----
+2021-10-14
+
+query T
+select to_date('20201231')
+----
+2020-12-31
+
+query T
+select to_date('2017-3-16 0:00:00')
+----
+2017-03-16
+
+query T
+select to_timestamp('2017-02-03 14:55:08 ');
+----
+2017-02-03 14:55:08.000000
+
+statement error 1006
+select to_timestamp('1684275059752');
+
+statement ok
+unset enable_strict_datetime_parser;

tests/sqllogictests/suites/query/functions/02_0012_function_datetimes_tz_disable_strict_parser.test

@@ -0,0 +1,7 @@
+statement ok
+set enable_strict_datetime_parser = 0;
+
+include ./02_0012_function_datetimes_tz.test
+
+statement ok
+unset enable_strict_datetime_parser;