select *from yourTableName where DATE(yourColumnName) = ’任何日期字符串’;

mysql> create table DateTimeDemo
   −> (
   −> ArrivalTime datetime
   −> );
Query OK, 0 rows affected (0.61 sec)

mysql> insert into DateTimeDemo values(now());
Query OK, 1 row affected (0.11 sec)

mysql> insert into DateTimeDemo values(date_add(now(),interval 2 year));
Query OK, 1 row affected (0.47 sec)

mysql> insert into DateTimeDemo values(date_add(now(),interval 1 year));
Query OK, 1 row affected (0.19 sec)

mysql> insert into DateTimeDemo values(date_add(now(),interval 4 year));
Query OK, 1 row affected (0.13 sec)

mysql> insert into DateTimeDemo values(date_add(now(),interval -2 year));
Query OK, 1 row affected (0.17 sec)

mysql> insert into DateTimeDemo values(date_add(now(),interval -1 year));
Query OK, 1 row affected (0.17 sec)

mysql> select *from DateTimeDemo;

+---------------------+
| ArrivalTime         |
+---------------------+
| 2018-12-06 10:12:45 |
| 2020-12-06 10:13:10 |
| 2019-12-06 10:13:21 |
| 2022-12-06 10:13:27 |
| 2016-12-06 10:13:42 |
| 2017-12-06 10:13:50 |
+---------------------+
6 rows in set (0.00 sec)

mysql> select *from DateTimeDemo where date(ArrivalTime) = '2022-12-06';

+---------------------+
| ArrivalTime         |
+---------------------+
| 2022-12-06 10:13:27 |
+---------------------+
1 row in set (0.14 sec)