Why I got output 0(Zero) on converting date like '1965-05-15' to TIMESTAMP?

As we know that with the help of MySQL UNIX_TIMESTAMP function, we can produce the number of seconds from given date/DateTime. But when we try to convert a date like ‘1965-05-15’ it would give 0(Zero) as output because the range of TIMESTAMP is between ‘1970-01-01 00:00:01’ to ‘2038-01-19 08:44:07’. Hence, the date values beyond TIMESTAMP range cannot be converted and will return 0 as output always.

Examples are given below −

mysql> Select UNIX_TIMESTAMP ('1965-05-15');
+----------------------------------------------+
| unix_timestamp('1965-05-15 05:04:30')        |
+----------------------------------------------+
|                                       0      |
+----------------------------------------------+
1 row in set (0.00 sec)

mysql> select UNIX_TIMESTAMP ('1970-05-15 05:04:30');
+----------------------------------------------+
| unix_timestamp('1970-05-15 05:04:30')        |
+----------------------------------------------+
|                                     11576070 |
+----------------------------------------------+
1 row in set (0.00 sec)