Datetime to Integer in MySQL?

In MySQL, convert datetime to integer using UNIX_TIMESTAMP() function. The syntax is as follows:

SELECT UNIX_TIMESTAMP(yourDatetimeColumnName) as anyVariableName FROM yourTableName;

To understand the above syntax, let us create a table. The query to create a table is as follows:

mysql> create table DatetimeToInteger
   -> (
   -> Id int NOT NULL AUTO_INCREMENT,
   -> ArrivalTime datetime,
   -> PRIMARY KEY(Id)
   -> );
Query OK, 0 rows affected (0.94 sec)

Insert some records in the table using insert command. The query is as follows:

mysql> insert into DatetimeToInteger(ArrivalTime) values(now());
Query OK, 1 row affected (0.09 sec)
mysql> insert into DatetimeToInteger(ArrivalTime) values(curdate());
Query OK, 1 row affected (0.21 sec)
mysql> insert into DatetimeToInteger(ArrivalTime) values('2017-09-21 13:10:55');
Query OK, 1 row affected (0.25 sec)
mysql> insert into DatetimeToInteger(ArrivalTime) values(date_add(now(),interval 3 year));
Query OK, 1 row affected (0.16 sec)

Display all records from the table using select statement. The query is as follows:

mysql> select *from DatetimeToInteger;

The following is the output:

+----+---------------------+
| Id | ArrivalTime         |
+----+---------------------+
|  1 | 2019-01-22 15:12:45 |
|  2 | 2019-01-22 00:00:00 |
|  3 | 2017-09-21 13:10:55 |
|  4 | 2022-01-22 15:14:32 |
+----+---------------------+
4 rows in set (0.00 sec)

Here is the query to convert datetime to integer:

mysql> select unix_timestamp(ArrivalTime) as DateTimeToIntegerDemo from DatetimeToInteger;

The following is the output:

+-----------------------+
| DateTimeToIntegerDemo |
+-----------------------+
|            1548150165 |
|            1548095400 |
|            1505979655 |
|            1642844672 |
+-----------------------+
4 rows in set (0.00 sec)