MySQL UTC时间转北京时间和convert_tz()函数

CONVERT_TZ(dt,from_tz,to_tz)函数说明：

转换datetime值dt，从 from_tz 由给定转到 to_tz 时区给出的时区，并返回的结果值。 如果参数无效该函数返回NULL。

示例：

mysql> SELECT CONVERT_TZ('2020-01-01 12:00:00','GMT','MET');
+---------------------------------------------------------+
| CONVERT_TZ('2020-01-01 12:00:00','GMT','MET')           |
+---------------------------------------------------------+
| 2020-01-01 13:00:00                                     |
+---------------------------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT CONVERT_TZ('2020-01-01 12:00:00','+00:00','+10:00');
+---------------------------------------------------------+
| CONVERT_TZ('2020-01-01 12:00:00','+00:00','+10:00')     |
+---------------------------------------------------------+
| 2020-01-01 22:00:00                                     |
+---------------------------------------------------------+

时间戳格式：

select FROM_UNIXTIME(1545711900) as utcTime;

select FROM_UNIXTIME(1545711900) as utcTime, CONVERT_TZ(FROM_UNIXTIME(1545711900),"+00:00","+08:00") as 北京时间;