-- add_months
SELECT add_months('2016-08-31', 1);
+-------------------------+
|add_months(2016-08-31, 1)|
+-------------------------+
|               2016-09-30|
+-------------------------+

-- current_date
SELECT current_date();
+--------------+
|current_date()|
+--------------+
|    2021-10-06|
+--------------+

SELECT current_date;
+--------------+
|current_date()|
+--------------+
|    2021-10-06|
+--------------+

-- current_timestamp
SELECT current_timestamp();
+--------------------+
| current_timestamp()|
+--------------------+
|2021-10-06 14:13:...|
+--------------------+

SELECT current_timestamp;
+--------------------+
| current_timestamp()|
+--------------------+
|2021-10-06 14:13:...|
+--------------------+

-- current_timezone
SELECT current_timezone();
+------------------+
|current_timezone()|
+------------------+
|           Etc/UTC|
+------------------+

-- date_add
SELECT date_add('2016-07-30', 1);
+-----------------------+
|date_add(2016-07-30, 1)|
+-----------------------+
|             2016-07-31|
+-----------------------+

-- date_format
SELECT date_format('2016-04-08', 'y');
+--------------------------+
|date_format(2016-04-08, y)|
+--------------------------+
|                      2016|
+--------------------------+

-- date_from_unix_date
SELECT date_from_unix_date(1);
+----------------------+
|date_from_unix_date(1)|
+----------------------+
|            1970-01-02|
+----------------------+

-- date_part
SELECT date_part('YEAR', TIMESTAMP '2019-08-12 01:00:00.123456');
+-------------------------------------------------------+
|date_part(YEAR, TIMESTAMP '2019-08-12 01:00:00.123456')|
+-------------------------------------------------------+
|                                                   2019|
+-------------------------------------------------------+

SELECT date_part('week', timestamp'2019-08-12 01:00:00.123456');
+-------------------------------------------------------+
|date_part(week, TIMESTAMP '2019-08-12 01:00:00.123456')|
+-------------------------------------------------------+
|                                                     33|
+-------------------------------------------------------+

SELECT date_part('doy', DATE'2019-08-12');
+---------------------------------+
|date_part(doy, DATE '2019-08-12')|
+---------------------------------+
|                              224|
+---------------------------------+

SELECT date_part('SECONDS', timestamp'2019-10-01 00:00:01.000001');
+----------------------------------------------------------+
|date_part(SECONDS, TIMESTAMP '2019-10-01 00:00:01.000001')|
+----------------------------------------------------------+
|                                                  1.000001|
+----------------------------------------------------------+

SELECT date_part('days', interval 5 days 3 hours 7 minutes);
+-------------------------------------------------+
|date_part(days, INTERVAL '5 03:07' DAY TO MINUTE)|
+-------------------------------------------------+
|                                                5|
+-------------------------------------------------+

SELECT date_part('seconds', interval 5 hours 30 seconds 1 milliseconds 1 microseconds);
+-------------------------------------------------------------+
|date_part(seconds, INTERVAL '05:00:30.001001' HOUR TO SECOND)|
+-------------------------------------------------------------+
|                                                    30.001001|
+-------------------------------------------------------------+

SELECT date_part('MONTH', INTERVAL '2021-11' YEAR TO MONTH);
+--------------------------------------------------+
|date_part(MONTH, INTERVAL '2021-11' YEAR TO MONTH)|
+--------------------------------------------------+
|                                                11|
+--------------------------------------------------+

SELECT date_part('MINUTE', INTERVAL '123 23:55:59.002001' DAY TO SECOND);
+---------------------------------------------------------------+
|date_part(MINUTE, INTERVAL '123 23:55:59.002001' DAY TO SECOND)|
+---------------------------------------------------------------+
|                                                             55|
+---------------------------------------------------------------+

-- date_sub
SELECT date_sub('2016-07-30', 1);
+-----------------------+
|date_sub(2016-07-30, 1)|
+-----------------------+
|             2016-07-29|
+-----------------------+

-- date_trunc
SELECT date_trunc('YEAR', '2015-03-05T09:32:05.359');
+-----------------------------------------+
|date_trunc(YEAR, 2015-03-05T09:32:05.359)|
+-----------------------------------------+
|                      2015-01-01 00:00:00|
+-----------------------------------------+

SELECT date_trunc('MM', '2015-03-05T09:32:05.359');
+---------------------------------------+
|date_trunc(MM, 2015-03-05T09:32:05.359)|
+---------------------------------------+
|                    2015-03-01 00:00:00|
+---------------------------------------+

SELECT date_trunc('DD', '2015-03-05T09:32:05.359');
+---------------------------------------+
|date_trunc(DD, 2015-03-05T09:32:05.359)|
+---------------------------------------+
|                    2015-03-05 00:00:00|
+---------------------------------------+

SELECT date_trunc('HOUR', '2015-03-05T09:32:05.359');
+-----------------------------------------+
|date_trunc(HOUR, 2015-03-05T09:32:05.359)|
+-----------------------------------------+
|                      2015-03-05 09:00:00|
+-----------------------------------------+

SELECT date_trunc('MILLISECOND', '2015-03-05T09:32:05.123456');
+---------------------------------------------------+
|date_trunc(MILLISECOND, 2015-03-05T09:32:05.123456)|
+---------------------------------------------------+
|                               2015-03-05 09:32:...|
+---------------------------------------------------+

-- datediff
SELECT datediff('2009-07-31', '2009-07-30');
+--------------------------------+
|datediff(2009-07-31, 2009-07-30)|
+--------------------------------+
|                               1|
+--------------------------------+

SELECT datediff('2009-07-30', '2009-07-31');
+--------------------------------+
|datediff(2009-07-30, 2009-07-31)|
+--------------------------------+
|                              -1|
+--------------------------------+

-- day
SELECT day('2009-07-30');
+---------------+
|day(2009-07-30)|
+---------------+
|             30|
+---------------+

-- dayofmonth
SELECT dayofmonth('2009-07-30');
+----------------------+
|dayofmonth(2009-07-30)|
+----------------------+
|                    30|
+----------------------+

-- dayofweek
SELECT dayofweek('2009-07-30');
+---------------------+
|dayofweek(2009-07-30)|
+---------------------+
|                    5|
+---------------------+

-- dayofyear
SELECT dayofyear('2016-04-09');
+---------------------+
|dayofyear(2016-04-09)|
+---------------------+
|                  100|
+---------------------+

-- extract
SELECT extract(YEAR FROM TIMESTAMP '2019-08-12 01:00:00.123456');
+---------------------------------------------------------+
|extract(YEAR FROM TIMESTAMP '2019-08-12 01:00:00.123456')|
+---------------------------------------------------------+
|                                                     2019|
+---------------------------------------------------------+

SELECT extract(week FROM timestamp'2019-08-12 01:00:00.123456');
+---------------------------------------------------------+
|extract(week FROM TIMESTAMP '2019-08-12 01:00:00.123456')|
+---------------------------------------------------------+
|                                                       33|
+---------------------------------------------------------+

SELECT extract(doy FROM DATE'2019-08-12');
+-----------------------------------+
|extract(doy FROM DATE '2019-08-12')|
+-----------------------------------+
|                                224|
+-----------------------------------+

SELECT extract(SECONDS FROM timestamp'2019-10-01 00:00:01.000001');
+------------------------------------------------------------+
|extract(SECONDS FROM TIMESTAMP '2019-10-01 00:00:01.000001')|
+------------------------------------------------------------+
|                                                    1.000001|
+------------------------------------------------------------+

SELECT extract(days FROM interval 5 days 3 hours 7 minutes);
+---------------------------------------------------+
|extract(days FROM INTERVAL '5 03:07' DAY TO MINUTE)|
+---------------------------------------------------+
|                                                  5|
+---------------------------------------------------+

SELECT extract(seconds FROM interval 5 hours 30 seconds 1 milliseconds 1 microseconds);
+---------------------------------------------------------------+
|extract(seconds FROM INTERVAL '05:00:30.001001' HOUR TO SECOND)|
+---------------------------------------------------------------+
|                                                      30.001001|
+---------------------------------------------------------------+

SELECT extract(MONTH FROM INTERVAL '2021-11' YEAR TO MONTH);
+----------------------------------------------------+
|extract(MONTH FROM INTERVAL '2021-11' YEAR TO MONTH)|
+----------------------------------------------------+
|                                                  11|
+----------------------------------------------------+

SELECT extract(MINUTE FROM INTERVAL '123 23:55:59.002001' DAY TO SECOND);
+-----------------------------------------------------------------+
|extract(MINUTE FROM INTERVAL '123 23:55:59.002001' DAY TO SECOND)|
+-----------------------------------------------------------------+
|                                                               55|
+-----------------------------------------------------------------+

-- from_unixtime
SELECT from_unixtime(0, 'yyyy-MM-dd HH:mm:ss');
+-------------------------------------+
|from_unixtime(0, yyyy-MM-dd HH:mm:ss)|
+-------------------------------------+
|                  1970-01-01 00:00:00|
+-------------------------------------+

SELECT from_unixtime(0);
+-------------------------------------+
|from_unixtime(0, yyyy-MM-dd HH:mm:ss)|
+-------------------------------------+
|                  1970-01-01 00:00:00|
+-------------------------------------+

-- from_utc_timestamp
SELECT from_utc_timestamp('2016-08-31', 'Asia/Seoul');
+------------------------------------------+
|from_utc_timestamp(2016-08-31, Asia/Seoul)|
+------------------------------------------+
|                       2016-08-31 09:00:00|
+------------------------------------------+

-- hour
SELECT hour('2009-07-30 12:58:59');
+-------------------------+
|hour(2009-07-30 12:58:59)|
+-------------------------+
|                       12|
+-------------------------+

-- last_day
SELECT last_day('2009-01-12');
+--------------------+
|last_day(2009-01-12)|
+--------------------+
|          2009-01-31|
+--------------------+

-- make_date
SELECT make_date(2013, 7, 15);
+----------------------+
|make_date(2013, 7, 15)|
+----------------------+
|            2013-07-15|
+----------------------+

SELECT make_date(2019, 13, 1);
+----------------------+
|make_date(2019, 13, 1)|
+----------------------+
|                  null|
+----------------------+

SELECT make_date(2019, 7, NULL);
+------------------------+
|make_date(2019, 7, NULL)|
+------------------------+
|                    null|
+------------------------+

SELECT make_date(2019, 2, 30);
+----------------------+
|make_date(2019, 2, 30)|
+----------------------+
|                  null|
+----------------------+

-- make_dt_interval
SELECT make_dt_interval(1, 12, 30, 01.001001);
+-------------------------------------+
|make_dt_interval(1, 12, 30, 1.001001)|
+-------------------------------------+
|                 INTERVAL '1 12:30...|
+-------------------------------------+

SELECT make_dt_interval(2);
+-----------------------------------+
|make_dt_interval(2, 0, 0, 0.000000)|
+-----------------------------------+
|               INTERVAL '2 00:00...|
+-----------------------------------+

SELECT make_dt_interval(100, null, 3);
+----------------------------------------+
|make_dt_interval(100, NULL, 3, 0.000000)|
+----------------------------------------+
|                                    null|
+----------------------------------------+

-- make_interval
SELECT make_interval(100, 11, 1, 1, 12, 30, 01.001001);
+----------------------------------------------+
|make_interval(100, 11, 1, 1, 12, 30, 1.001001)|
+----------------------------------------------+
|                          100 years 11 mont...|
+----------------------------------------------+

SELECT make_interval(100, null, 3);
+----------------------------------------------+
|make_interval(100, NULL, 3, 0, 0, 0, 0.000000)|
+----------------------------------------------+
|                                          null|
+----------------------------------------------+

SELECT make_interval(0, 1, 0, 1, 0, 0, 100.000001);
+-------------------------------------------+
|make_interval(0, 1, 0, 1, 0, 0, 100.000001)|
+-------------------------------------------+
|                       1 months 1 days 1...|
+-------------------------------------------+

-- make_timestamp
SELECT make_timestamp(2014, 12, 28, 6, 30, 45.887);
+-------------------------------------------+
|make_timestamp(2014, 12, 28, 6, 30, 45.887)|
+-------------------------------------------+
|                       2014-12-28 06:30:...|
+-------------------------------------------+

SELECT make_timestamp(2014, 12, 28, 6, 30, 45.887, 'CET');
+------------------------------------------------+
|make_timestamp(2014, 12, 28, 6, 30, 45.887, CET)|
+------------------------------------------------+
|                            2014-12-28 05:30:...|
+------------------------------------------------+

SELECT make_timestamp(2019, 6, 30, 23, 59, 60);
+---------------------------------------+
|make_timestamp(2019, 6, 30, 23, 59, 60)|
+---------------------------------------+
|                    2019-07-01 00:00:00|
+---------------------------------------+

SELECT make_timestamp(2019, 6, 30, 23, 59, 1);
+--------------------------------------+
|make_timestamp(2019, 6, 30, 23, 59, 1)|
+--------------------------------------+
|                   2019-06-30 23:59:01|
+--------------------------------------+

SELECT make_timestamp(2019, 13, 1, 10, 11, 12, 'PST');
+--------------------------------------------+
|make_timestamp(2019, 13, 1, 10, 11, 12, PST)|
+--------------------------------------------+
|                                        null|
+--------------------------------------------+

SELECT make_timestamp(null, 7, 22, 15, 30, 0);
+--------------------------------------+
|make_timestamp(NULL, 7, 22, 15, 30, 0)|
+--------------------------------------+
|                                  null|
+--------------------------------------+

-- make_ym_interval
SELECT make_ym_interval(1, 2);
+----------------------+
|make_ym_interval(1, 2)|
+----------------------+
|  INTERVAL '1-2' YE...|
+----------------------+

SELECT make_ym_interval(1, 0);
+----------------------+
|make_ym_interval(1, 0)|
+----------------------+
|  INTERVAL '1-0' YE...|
+----------------------+

SELECT make_ym_interval(-1, 1);
+-----------------------+
|make_ym_interval(-1, 1)|
+-----------------------+
|   INTERVAL '-0-11' ...|
+-----------------------+

SELECT make_ym_interval(2);
+----------------------+
|make_ym_interval(2, 0)|
+----------------------+
|  INTERVAL '2-0' YE...|
+----------------------+

-- minute
SELECT minute('2009-07-30 12:58:59');
+---------------------------+
|minute(2009-07-30 12:58:59)|
+---------------------------+
|                         58|
+---------------------------+

-- month
SELECT month('2016-07-30');
+-----------------+
|month(2016-07-30)|
+-----------------+
|                7|
+-----------------+

-- months_between
SELECT months_between('1997-02-28 10:30:00', '1996-10-30');
+-----------------------------------------------------+
|months_between(1997-02-28 10:30:00, 1996-10-30, true)|
+-----------------------------------------------------+
|                                           3.94959677|
+-----------------------------------------------------+

SELECT months_between('1997-02-28 10:30:00', '1996-10-30', false);
+------------------------------------------------------+
|months_between(1997-02-28 10:30:00, 1996-10-30, false)|
+------------------------------------------------------+
|                                    3.9495967741935485|
+------------------------------------------------------+

-- next_day
SELECT next_day('2015-01-14', 'TU');
+------------------------+
|next_day(2015-01-14, TU)|
+------------------------+
|              2015-01-20|
+------------------------+

-- now
SELECT now();
+--------------------+
|               now()|
+--------------------+
|2021-10-06 14:13:...|
+--------------------+

-- quarter
SELECT quarter('2016-08-31');
+-------------------+
|quarter(2016-08-31)|
+-------------------+
|                  3|
+-------------------+

-- second
SELECT second('2009-07-30 12:58:59');
+---------------------------+
|second(2009-07-30 12:58:59)|
+---------------------------+
|                         59|
+---------------------------+

-- session_window
SELECT a, session_window.start, session_window.end, count(*) as cnt FROM VALUES ('A1', '2021-01-01 00:00:00'), ('A1', '2021-01-01 00:04:30'), ('A1', '2021-01-01 00:10:00'), ('A2', '2021-01-01 00:01:00') AS tab(a, b) GROUP by a, session_window(b, '5 minutes') ORDER BY a, start;
+---+-------------------+-------------------+---+
|  a|              start|                end|cnt|
+---+-------------------+-------------------+---+
| A1|2021-01-01 00:00:00|2021-01-01 00:09:30|  2|
| A1|2021-01-01 00:10:00|2021-01-01 00:15:00|  1|
| A2|2021-01-01 00:01:00|2021-01-01 00:06:00|  1|
+---+-------------------+-------------------+---+

SELECT a, session_window.start, session_window.end, count(*) as cnt FROM VALUES ('A1', '2021-01-01 00:00:00'), ('A1', '2021-01-01 00:04:30'), ('A1', '2021-01-01 00:10:00'), ('A2', '2021-01-01 00:01:00'), ('A2', '2021-01-01 00:04:30') AS tab(a, b) GROUP by a, session_window(b, CASE WHEN a = 'A1' THEN '5 minutes' WHEN a = 'A2' THEN '1 minute' ELSE '10 minutes' END) ORDER BY a, start;
+---+-------------------+-------------------+---+
|  a|              start|                end|cnt|
+---+-------------------+-------------------+---+
| A1|2021-01-01 00:00:00|2021-01-01 00:09:30|  2|
| A1|2021-01-01 00:10:00|2021-01-01 00:15:00|  1|
| A2|2021-01-01 00:01:00|2021-01-01 00:02:00|  1|
| A2|2021-01-01 00:04:30|2021-01-01 00:05:30|  1|
+---+-------------------+-------------------+---+

-- timestamp_micros
SELECT timestamp_micros(1230219000123123);
+----------------------------------+
|timestamp_micros(1230219000123123)|
+----------------------------------+
|              2008-12-25 15:30:...|
+----------------------------------+

-- timestamp_millis
SELECT timestamp_millis(1230219000123);
+-------------------------------+
|timestamp_millis(1230219000123)|
+-------------------------------+
|           2008-12-25 15:30:...|
+-------------------------------+

-- timestamp_seconds
SELECT timestamp_seconds(1230219000);
+-----------------------------+
|timestamp_seconds(1230219000)|
+-----------------------------+
|          2008-12-25 15:30:00|
+-----------------------------+

SELECT timestamp_seconds(1230219000.123);
+---------------------------------+
|timestamp_seconds(1230219000.123)|
+---------------------------------+
|             2008-12-25 15:30:...|
+---------------------------------+

-- to_date
SELECT to_date('2009-07-30 04:17:52');
+----------------------------+
|to_date(2009-07-30 04:17:52)|
+----------------------------+
|                  2009-07-30|
+----------------------------+

SELECT to_date('2016-12-31', 'yyyy-MM-dd');
+-------------------------------+
|to_date(2016-12-31, yyyy-MM-dd)|
+-------------------------------+
|                     2016-12-31|
+-------------------------------+

-- to_timestamp
SELECT to_timestamp('2016-12-31 00:12:00');
+---------------------------------+
|to_timestamp(2016-12-31 00:12:00)|
+---------------------------------+
|              2016-12-31 00:12:00|
+---------------------------------+

SELECT to_timestamp('2016-12-31', 'yyyy-MM-dd');
+------------------------------------+
|to_timestamp(2016-12-31, yyyy-MM-dd)|
+------------------------------------+
|                 2016-12-31 00:00:00|
+------------------------------------+

-- to_unix_timestamp
SELECT to_unix_timestamp('2016-04-08', 'yyyy-MM-dd');
+-----------------------------------------+
|to_unix_timestamp(2016-04-08, yyyy-MM-dd)|
+-----------------------------------------+
|                               1460073600|
+-----------------------------------------+

-- to_utc_timestamp
SELECT to_utc_timestamp('2016-08-31', 'Asia/Seoul');
+----------------------------------------+
|to_utc_timestamp(2016-08-31, Asia/Seoul)|
+----------------------------------------+
|                     2016-08-30 15:00:00|
+----------------------------------------+

-- trunc
SELECT trunc('2019-08-04', 'week');
+-----------------------+
|trunc(2019-08-04, week)|
+-----------------------+
|             2019-07-29|
+-----------------------+

SELECT trunc('2019-08-04', 'quarter');
+--------------------------+
|trunc(2019-08-04, quarter)|
+--------------------------+
|                2019-07-01|
+--------------------------+

SELECT trunc('2009-02-12', 'MM');
+---------------------+
|trunc(2009-02-12, MM)|
+---------------------+
|           2009-02-01|
+---------------------+

SELECT trunc('2015-10-27', 'YEAR');
+-----------------------+
|trunc(2015-10-27, YEAR)|
+-----------------------+
|             2015-01-01|
+-----------------------+

-- unix_date
SELECT unix_date(DATE("1970-01-02"));
+---------------------+
|unix_date(1970-01-02)|
+---------------------+
|                    1|
+---------------------+

-- unix_micros
SELECT unix_micros(TIMESTAMP('1970-01-01 00:00:01Z'));
+---------------------------------+
|unix_micros(1970-01-01 00:00:01Z)|
+---------------------------------+
|                          1000000|
+---------------------------------+

-- unix_millis
SELECT unix_millis(TIMESTAMP('1970-01-01 00:00:01Z'));
+---------------------------------+
|unix_millis(1970-01-01 00:00:01Z)|
+---------------------------------+
|                             1000|
+---------------------------------+

-- unix_seconds
SELECT unix_seconds(TIMESTAMP('1970-01-01 00:00:01Z'));
+----------------------------------+
|unix_seconds(1970-01-01 00:00:01Z)|
+----------------------------------+
|                                 1|
+----------------------------------+

-- unix_timestamp
SELECT unix_timestamp();
+--------------------------------------------------------+
|unix_timestamp(current_timestamp(), yyyy-MM-dd HH:mm:ss)|
+--------------------------------------------------------+
|                                              1633529631|
+--------------------------------------------------------+

SELECT unix_timestamp('2016-04-08', 'yyyy-MM-dd');
+--------------------------------------+
|unix_timestamp(2016-04-08, yyyy-MM-dd)|
+--------------------------------------+
|                            1460073600|
+--------------------------------------+

-- weekday
SELECT weekday('2009-07-30');
+-------------------+
|weekday(2009-07-30)|
+-------------------+
|                  3|
+-------------------+

-- weekofyear
SELECT weekofyear('2008-02-20');
+----------------------+
|weekofyear(2008-02-20)|
+----------------------+
|                     8|
+----------------------+

-- window
SELECT a, window.start, window.end, count(*) as cnt FROM VALUES ('A1', '2021-01-01 00:00:00'), ('A1', '2021-01-01 00:04:30'), ('A1', '2021-01-01 00:06:00'), ('A2', '2021-01-01 00:01:00') AS tab(a, b) GROUP by a, window(b, '5 minutes') ORDER BY a, start;
+---+-------------------+-------------------+---+
|  a|              start|                end|cnt|
+---+-------------------+-------------------+---+
| A1|2021-01-01 00:00:00|2021-01-01 00:05:00|  2|
| A1|2021-01-01 00:05:00|2021-01-01 00:10:00|  1|
| A2|2021-01-01 00:00:00|2021-01-01 00:05:00|  1|
+---+-------------------+-------------------+---+

SELECT a, window.start, window.end, count(*) as cnt FROM VALUES ('A1', '2021-01-01 00:00:00'), ('A1', '2021-01-01 00:04:30'), ('A1', '2021-01-01 00:06:00'), ('A2', '2021-01-01 00:01:00') AS tab(a, b) GROUP by a, window(b, '10 minutes', '5 minutes') ORDER BY a, start;
+---+-------------------+-------------------+---+
|  a|              start|                end|cnt|
+---+-------------------+-------------------+---+
| A1|2020-12-31 23:55:00|2021-01-01 00:05:00|  2|
| A1|2021-01-01 00:00:00|2021-01-01 00:10:00|  3|
| A1|2021-01-01 00:05:00|2021-01-01 00:15:00|  1|
| A2|2020-12-31 23:55:00|2021-01-01 00:05:00|  1|
| A2|2021-01-01 00:00:00|2021-01-01 00:10:00|  1|
+---+-------------------+-------------------+---+

-- year
SELECT year('2016-07-30');
+----------------+
|year(2016-07-30)|
+----------------+
|            2016|
+----------------+