SELECT FROM_UNIXTIME(yourColumnName,’%Y-%m-%d') as AnyVariableName from
yourTableName;

mysql> create table IntToDateDemo
   -> (
   -> Number int
   -> );
Query OK, 0 rows affected (0.59 sec)

mysql> truncate table IntToDateDemo;
Query OK, 0 rows affected (4.11 sec)

mysql> insert into IntToDateDemo values(1545284721);
Query OK, 1 row affected (0.19 sec)

mysql> insert into IntToDateDemo values(1576820738);
Query OK, 1 row affected (0.19 sec)

mysql> insert into IntToDateDemo values(1513748752);
Query OK, 1 row affected (0.24 sec)

mysql> insert into IntToDateDemo values(1671515204);
Query OK, 1 row affected (0.18 sec)

mysql> select *from IntToDateDemo;

+------------+
| Number     |
+------------+
| 1545284721 |
| 1576820738 |
| 1513748752 |
| 1671515204 |
+------------+
4 rows in set (0.00 sec)

mysql> select from_unixtime(Number,'%Y-%m-%d') as DateDemo from IntToDateDemo;

+------------+
| DateDemo   |
+------------+
| 2018-12-20 |
| 2019-12-20 |
| 2017-12-20 |
| 2022-12-20 |
+------------+
4 rows in set (0.00 sec)