• 建立表：

mysql> desc test_timestamp1;
+-------+-----------+------+-----+---------+-------+
| Field | Type      | Null | Key | Default | Extra |
+-------+-----------+------+-----+---------+-------+
| time  | timestamp | YES  |     | NULL    |       |
+-------+-----------+------+-----+---------+-------+

• 插入資料，並查詢，mysql官方文件解釋：timestamp的範圍：1970-01-01 00:00:01UTC～2038/01/19 3:14:07UTC，

• 我們是東八區，所以我們的timestamp的範圍：1970-01-01 8:00:01UTC～2038/01/19 11:14:07UTC,測試很簡單：

mysql> insert into test_timestamp1 values('2038/01/19 11:14:07');
Query OK, 1 row affected (0.00 sec)
mysql> insert into test_timestamp1 values('2038/01/19 11:14:08');
ERROR 1292 (22007): Incorrect datetime value: '2038/01/19 11:14:08' for column 'time' at row 1

mysql> insert into test_timestamp1 values('1970-01-01 8:00:01');
Query OK, 1 row affected (0.00 sec)
mysql> insert into test_timestamp1 values('1970-01-01 8:00:00');
ERROR 1292 (22007): Incorrect datetime value: '1970-01-01 8:00:00' for column 'time' at row 1

• 為什麼有這樣的限制？可以從資料檔案中找到答案：

mysql> select * from test_timestamp1 limit 2;
+---------------------+
| time                |
+---------------------+
| 2038-01-19 11:14:07 |
| 2038-01-19 11:14:06 |
+---------------------+
2038-01-19 11:14:07
查看錶空間檔案：
hexdump -C -v test_timestamp1.ibd|more
0000c1a0  00 00 00 07 75 0b 00 00  01 43 f1 16 e1 00 00 01
0000c1b0  7d 01 10 7f ff ff ff 00  00 00 68 00 1d 00 00 00
0000c1c0  07 75 0c 00 00 01 43 f1  17 e2 00 00 02 4e 01 10
0000c1d0  7f ff ff fe 00 00 00 70  00 1d 00 00 00 07 75 0d
0000c1e0  00 00 01 43 f1 7c b4 00  00 02 2a 01 10 7f ff ff

• 猜測7f ff ff fe（01111 1111 .... 1110）就是2038-01-19 11:14:06，7f ff ff ff（01111 1111 .... 1111）（最高位是符號位？）就是2038-01-19 11:14:07，為什麼這麼說？

做個簡單的查詢：
mysql> select unix_timestamp('2038-01-19 11:14:07');
+---------------------------------------+
| unix_timestamp('2038-01-19 11:14:07') |
+---------------------------------------+
|                            2147483647 |
+---------------------------------------+
2147483647就是"2038/01/19 3:14:07UTC"減去"1970-01-01 8:00:01 UTC"的秒數，也就是說實際上mysql在儲存時間戳的時候，會求取32位的整數，儲存在磁碟上。
mysql> select pow(2,31)-1;
+-------------+
| pow(2,31)-1 |
+-------------+
|  2147483647 |
+-------------+