drop table if exists t1, test;
select extract(DAY_MICROSECOND FROM "1999-01-02 10:11:12.000123");
extract(DAY_MICROSECOND FROM "1999-01-02 10:11:12.000123")
2101112000123
select extract(HOUR_MICROSECOND FROM "1999-01-02 10:11:12.000123");
extract(HOUR_MICROSECOND FROM "1999-01-02 10:11:12.000123")
101112000123
select extract(MINUTE_MICROSECOND FROM "1999-01-02 10:11:12.000123");
extract(MINUTE_MICROSECOND FROM "1999-01-02 10:11:12.000123")
1112000123
select extract(SECOND_MICROSECOND FROM "1999-01-02 10:11:12.000123");
extract(SECOND_MICROSECOND FROM "1999-01-02 10:11:12.000123")
12000123
select extract(MICROSECOND FROM "1999-01-02 10:11:12.000123");
extract(MICROSECOND FROM "1999-01-02 10:11:12.000123")
123
select date_format("1997-12-31 23:59:59.000002", "%f");
date_format("1997-12-31 23:59:59.000002", "%f")
000002
select date_add("1997-12-31 23:59:59.000002",INTERVAL "10000 99:99:99.999999" DAY_MICROSECOND);
date_add("1997-12-31 23:59:59.000002",INTERVAL "10000 99:99:99.999999" DAY_MICROSECOND)
2025-05-23 04:40:39.000001
select date_add("1997-12-31 23:59:59.000002",INTERVAL "10000:99:99.999999" HOUR_MICROSECOND);
date_add("1997-12-31 23:59:59.000002",INTERVAL "10000:99:99.999999" HOUR_MICROSECOND)
1999-02-21 17:40:39.000001
select date_add("1997-12-31 23:59:59.000002",INTERVAL "10000:99.999999" MINUTE_MICROSECOND);
date_add("1997-12-31 23:59:59.000002",INTERVAL "10000:99.999999" MINUTE_MICROSECOND)
1998-01-07 22:41:39.000001
select date_add("1997-12-31 23:59:59.000002",INTERVAL "10000.999999" SECOND_MICROSECOND);
date_add("1997-12-31 23:59:59.000002",INTERVAL "10000.999999" SECOND_MICROSECOND)
1998-01-01 02:46:40.000001
select date_add("1997-12-31 23:59:59.000002",INTERVAL "999999" MICROSECOND);
date_add("1997-12-31 23:59:59.000002",INTERVAL "999999" MICROSECOND)
1998-01-01 00:00:00.000001
select date_sub("1998-01-01 00:00:00.000001",INTERVAL "1 1:1:1.000002" DAY_MICROSECOND);
date_sub("1998-01-01 00:00:00.000001",INTERVAL "1 1:1:1.000002" DAY_MICROSECOND)
1997-12-30 22:58:58.999999
select date_sub("1998-01-01 00:00:00.000001",INTERVAL "1:1:1.000002" HOUR_MICROSECOND);
date_sub("1998-01-01 00:00:00.000001",INTERVAL "1:1:1.000002" HOUR_MICROSECOND)
1997-12-31 22:58:58.999999
select date_sub("1998-01-01 00:00:00.000001",INTERVAL "1:1.000002" MINUTE_MICROSECOND);
date_sub("1998-01-01 00:00:00.000001",INTERVAL "1:1.000002" MINUTE_MICROSECOND)
1997-12-31 23:58:58.999999
select date_sub("1998-01-01 00:00:00.000001",INTERVAL "1.000002" SECOND_MICROSECOND);
date_sub("1998-01-01 00:00:00.000001",INTERVAL "1.000002" SECOND_MICROSECOND)
1997-12-31 23:59:58.999999
select date_sub("1998-01-01 00:00:00.000001",INTERVAL "000002" MICROSECOND);
date_sub("1998-01-01 00:00:00.000001",INTERVAL "000002" MICROSECOND)
1997-12-31 23:59:59.999999
select adddate("1997-12-31 23:59:59.000001", 10);
adddate("1997-12-31 23:59:59.000001", 10)
1998-01-10 23:59:59.000001
select subdate("1997-12-31 23:59:59.000001", 10);
subdate("1997-12-31 23:59:59.000001", 10)
1997-12-21 23:59:59.000001
select datediff("1997-12-31 23:59:59.000001","1997-12-30");
datediff("1997-12-31 23:59:59.000001","1997-12-30")
1
select datediff("1997-11-30 23:59:59.000001","1997-12-31");
datediff("1997-11-30 23:59:59.000001","1997-12-31")
-31
SET @@SQL_MODE="ALLOW_INVALID_DATES";
select datediff("1997-11-31 23:59:59.000001","1997-12-31");
datediff("1997-11-31 23:59:59.000001","1997-12-31")
NULL
Warnings:
Warning	1292	Incorrect datetime value: '1997-11-31 23:59:59.000001'
SET @@SQL_MODE="";
select datediff("1997-11-31 23:59:59.000001","1997-12-31");
datediff("1997-11-31 23:59:59.000001","1997-12-31")
NULL
Warnings:
Warning	1292	Incorrect datetime value: '1997-11-31 23:59:59.000001'
select datediff("1997-11-30 23:59:59.000001",null);
datediff("1997-11-30 23:59:59.000001",null)
NULL
select weekofyear("1997-11-30 23:59:59.000001");
weekofyear("1997-11-30 23:59:59.000001")
48
select makedate(03,1);
makedate(03,1)
2003-01-01
select makedate('0003',1);
makedate('0003',1)
2003-01-01
select makedate(1997,1);
makedate(1997,1)
1997-01-01
select makedate(1997,0);
makedate(1997,0)
NULL
select makedate(9999,365);
makedate(9999,365)
9999-12-31
select makedate(9999,366);
makedate(9999,366)
NULL
select makedate(100,1);
makedate(100,1)
0100-01-01
select addtime("1997-12-31 23:59:59.999999", "1 1:1:1.000002");
addtime("1997-12-31 23:59:59.999999", "1 1:1:1.000002")
1998-01-02 01:01:01.000001
select subtime("1997-12-31 23:59:59.000001", "1 1:1:1.000002");
subtime("1997-12-31 23:59:59.000001", "1 1:1:1.000002")
1997-12-30 22:58:57.999999
select addtime("1997-12-31 23:59:59.999999", "1998-01-01 01:01:01.999999");
addtime("1997-12-31 23:59:59.999999", "1998-01-01 01:01:01.999999")
NULL
Warnings:
Warning	1292	Incorrect INTERVAL DAY TO SECOND value: '1998-01-01 01:01:01.999999'
select subtime("1997-12-31 23:59:59.999999", "1998-01-01 01:01:01.999999");
subtime("1997-12-31 23:59:59.999999", "1998-01-01 01:01:01.999999")
NULL
Warnings:
Warning	1292	Incorrect INTERVAL DAY TO SECOND value: '1998-01-01 01:01:01.999999'
select subtime("01:00:00.999999", "02:00:00.999998");
subtime("01:00:00.999999", "02:00:00.999998")
-00:59:59.999999
select subtime("02:01:01.999999", "01:01:01.999999");
subtime("02:01:01.999999", "01:01:01.999999")
01:00:00
select timediff("1997-01-01 23:59:59.000001","1995-12-31 23:59:59.000002");
timediff("1997-01-01 23:59:59.000001","1995-12-31 23:59:59.000002")
838:59:59.999999
Warnings:
Warning	1292	Truncated incorrect time value: '8807:59:59.999999'
select timediff("1997-12-31 23:59:59.000001","1997-12-30 01:01:01.000002");
timediff("1997-12-31 23:59:59.000001","1997-12-30 01:01:01.000002")
46:58:57.999999
select timediff("1997-12-30 23:59:59.000001","1997-12-31 23:59:59.000002");
timediff("1997-12-30 23:59:59.000001","1997-12-31 23:59:59.000002")
-24:00:00.000001
select timediff("1997-12-31 23:59:59.000001","23:59:59.000001");
timediff("1997-12-31 23:59:59.000001","23:59:59.000001")
NULL
select timediff("2000:01:01 00:00:00", "2000:01:01 00:00:00.000001");
timediff("2000:01:01 00:00:00", "2000:01:01 00:00:00.000001")
-00:00:00.000001
select timediff("2005-01-11 15:48:49.999999", "2005-01-11 15:48:50");
timediff("2005-01-11 15:48:49.999999", "2005-01-11 15:48:50")
-00:00:00.000001
select maketime(10,11,12);
maketime(10,11,12)
10:11:12
select maketime(25,11,12);
maketime(25,11,12)
25:11:12
select maketime(-25,11,12);
maketime(-25,11,12)
-25:11:12
select timestamp("2001-12-01", "01:01:01.999999");
timestamp("2001-12-01", "01:01:01.999999")
2001-12-01 01:01:01.999999
select timestamp("2001-13-01", "01:01:01.000001");
timestamp("2001-13-01", "01:01:01.000001")
NULL
Warnings:
Warning	1292	Incorrect datetime value: '2001-13-01'
select timestamp("2001-12-01", "25:01:01");
timestamp("2001-12-01", "25:01:01")
2001-12-02 01:01:01
select timestamp("2001-12-01 01:01:01.000100");
timestamp("2001-12-01 01:01:01.000100")
2001-12-01 01:01:01.000100
select timestamp("2001-12-01");
timestamp("2001-12-01")
2001-12-01 00:00:00
select day("1997-12-31 23:59:59.000001");
day("1997-12-31 23:59:59.000001")
31
select date("1997-12-31 23:59:59.000001");
date("1997-12-31 23:59:59.000001")
1997-12-31
select date("1997-13-31 23:59:59.000001");
date("1997-13-31 23:59:59.000001")
NULL
Warnings:
Warning	1292	Incorrect datetime value: '1997-13-31 23:59:59.000001'
select time("1997-12-31 23:59:59.000001");
time("1997-12-31 23:59:59.000001")
23:59:59.000001
select time("1997-12-31 25:59:59.000001");
time("1997-12-31 25:59:59.000001")
NULL
Warnings:
Warning	1292	Incorrect time value: '1997-12-31 25:59:59.000001'
select microsecond("1997-12-31 23:59:59.000001");
microsecond("1997-12-31 23:59:59.000001")
1
create table t1 
select makedate(1997,1) as f1,
addtime(cast("1997-12-31 23:59:59.000001" as datetime(6)), "1 1:1:1.000002") as f2,
addtime(cast("23:59:59.999999" as time(6)) , "1 1:1:1.000002") as f3,
timediff("1997-12-31 23:59:59.000001","1997-12-30 01:01:01.000002") as f4,
timediff("1997-12-30 23:59:59.000001","1997-12-31 23:59:59.000002") as f5,
maketime(10,11,12) as f6,
timestamp(cast("2001-12-01" as date), "01:01:01") as f7,
date("1997-12-31 23:59:59.000001") as f8,
time("1997-12-31 23:59:59.000001") as f9;
describe t1;
Field	Type	Null	Key	Default	Extra
f1	date	YES		NULL	
f2	datetime(6)	YES		NULL	
f3	time(6)	YES		NULL	
f4	time(6)	YES		NULL	
f5	time(6)	YES		NULL	
f6	time	YES		NULL	
f7	datetime	YES		NULL	
f8	date	YES		NULL	
f9	time(6)	YES		NULL	
select * from t1;
f1	f2	f3	f4	f5	f6	f7	f8	f9
1997-01-01	1998-01-02 01:01:00.000003	49:01:01.000001	46:58:57.999999	-24:00:00.000001	10:11:12	2001-12-01 01:01:01	1997-12-31	23:59:59.000001
create table test(t1 datetime, t2 time, t3 time, t4 datetime);
insert into test values 
('2001-01-01 01:01:01', '01:01:01', null, '2001-02-01 01:01:01'),
('2001-01-01 01:01:01', '-01:01:01', '-23:59:59', "1997-12-31 23:59:59.000001"),
('1997-12-31 23:59:59.000001', '-23:59:59', '-01:01:01', '2001-01-01 01:01:01'),
('2001-01-01 01:01:01', '01:01:01', '-1 01:01:01', null),
('2001-01-01 01:01:01', '-01:01:01', '1 01:01:01', '2001-01-01 01:01:01'),
('2001-01-01 01:01:01', null, '-1 01:01:01', null),
(null, null, null, null),
('2001-01-01 01:01:01', '01:01:01', '1 01:01:01', '2001-01-01 01:01:01');
SELECT ADDTIME(t1,t2) As ttt, ADDTIME(t2, t3) As qqq from test;
ttt	qqq
2001-01-01 02:02:02	NULL
2001-01-01 00:00:00	-25:01:00
1997-12-31 00:00:00	-25:01:00
2001-01-01 02:02:02	-24:00:00
2001-01-01 00:00:00	24:00:00
NULL	NULL
NULL	NULL
2001-01-01 02:02:02	26:02:02
SELECT TIMEDIFF(t1, t4) As ttt, TIMEDIFF(t2, t3) As qqq,
TIMEDIFF(t3, t2) As eee, TIMEDIFF(t2, t4) As rrr from test;
ttt	qqq	eee	rrr
-744:00:00	NULL	NULL	NULL
838:59:59	22:58:58	-22:58:58	NULL
-838:59:59	-22:58:58	22:58:58	NULL
NULL	26:02:02	-26:02:02	NULL
00:00:00	-26:02:02	26:02:02	NULL
NULL	NULL	NULL	NULL
NULL	NULL	NULL	NULL
00:00:00	-24:00:00	24:00:00	NULL
Warnings:
Warning	1292	Truncated incorrect time value: '26305:01:02'
Warning	1292	Truncated incorrect time value: '-26305:01:02'
drop table t1, test;
select addtime("-01:01:01.01", "-23:59:59.1") as a;
a
-25:01:00.110000
select microsecond("1997-12-31 23:59:59.01") as a;
a
10000
select microsecond(19971231235959.01) as a;
a
10000
select date_add("1997-12-31",INTERVAL "10.09" SECOND_MICROSECOND) as a;
a
1997-12-31 00:00:10.090000
select str_to_date("2003-01-02 10:11:12.0012", "%Y-%m-%d %H:%i:%S.%f");
str_to_date("2003-01-02 10:11:12.0012", "%Y-%m-%d %H:%i:%S.%f")
2003-01-02 10:11:12.001200
select timediff('2008-09-29 20:10:10','2008-09-30 20:10:10'),time('00:00:00');
timediff('2008-09-29 20:10:10','2008-09-30 20:10:10')	time('00:00:00')
-24:00:00	00:00:00
select timediff('2008-09-29 20:10:10','2008-09-30 20:10:10')>time('00:00:00');
timediff('2008-09-29 20:10:10','2008-09-30 20:10:10')>time('00:00:00')
0
select timediff('2008-09-29 20:10:10','2008-09-30 20:10:10')<time('00:00:00');
timediff('2008-09-29 20:10:10','2008-09-30 20:10:10')<time('00:00:00')
1
SELECT CAST(time('-73:42:12') AS DECIMAL);
CAST(time('-73:42:12') AS DECIMAL)
-734212
SELECT TIMEDIFF(TIME('17:00:00'),TIME('17:00:00'))=TIME('00:00:00') AS 1Eq,
TIMEDIFF(TIME('17:59:00'),TIME('17:00:00'))=TIME('00:00:00') AS 1NEq1,
TIMEDIFF(TIME('18:00:00'),TIME('17:00:00'))=TIME('00:00:00') AS 1NEq2,
TIMEDIFF(TIME('17:00:00'),TIME('17:00:00'))=     '00:00:00'  AS 2Eq,
TIMEDIFF(TIME('17:59:00'),TIME('17:00:00'))=     '00:00:00'  AS 2NEq1,
TIMEDIFF(TIME('18:00:00'),TIME('17:00:00'))=     '00:00:00'  AS 2NEq2,
TIMEDIFF(TIME('17:00:00'),TIME('17:00:00'))=TIME(0)          AS 3Eq,
TIMEDIFF(TIME('17:59:00'),TIME('17:00:00'))=TIME(0)          AS 3NEq1,
TIMEDIFF(TIME('18:00:00'),TIME('17:00:00'))=TIME(0)          AS 3NEq2,
TIME(0) AS Time0, TIME('00:00:00') AS Time00, '00:00:00' AS Literal0000,
TIMEDIFF(TIME('17:59:00'),TIME('17:00:00')),
TIMEDIFF(TIME('17:00:00'),TIME('17:59:00'));
1Eq	1NEq1	1NEq2	2Eq	2NEq1	2NEq2	3Eq	3NEq1	3NEq2	Time0	Time00	Literal0000	TIMEDIFF(TIME('17:59:00'),TIME('17:00:00'))	TIMEDIFF(TIME('17:00:00'),TIME('17:59:00'))
1	0	0	1	0	0	1	0	0	00:00:00	00:00:00	00:00:00	00:59:00	-00:59:00
SELECT sec_to_time(3020399)=TIME('838:59:59');
sec_to_time(3020399)=TIME('838:59:59')
1
SELECT sec_to_time(-3020399)=TIME('-838:59:59');
sec_to_time(-3020399)=TIME('-838:59:59')
1
SELECT sec_to_time(-3020399)='-838:59:59';
sec_to_time(-3020399)='-838:59:59'
1
SELECT time(sec_to_time(-3020399))=TIME('-838:59:59');
time(sec_to_time(-3020399))=TIME('-838:59:59')
1
SELECT time(sec_to_time(-3020399))=TIME('-838:59:58');
time(sec_to_time(-3020399))=TIME('-838:59:58')
0
SELECT maketime(-1,0,1)='-01:00:01';
maketime(-1,0,1)='-01:00:01'
1
SELECT TIME(maketime(-1,0,1))=CAST('-01:00:01' AS TIME);
TIME(maketime(-1,0,1))=CAST('-01:00:01' AS TIME)
1
SELECT maketime(-1,0,1)=CAST('-01:00:01' AS TIME);
maketime(-1,0,1)=CAST('-01:00:01' AS TIME)
1
SELECT maketime(1,0,1)=CAST('01:00:01' AS TIME);
maketime(1,0,1)=CAST('01:00:01' AS TIME)
1
SELECT maketime(1,0,1)=CAST('01:00:02' AS TIME);
maketime(1,0,1)=CAST('01:00:02' AS TIME)
0