from_second

description

Syntax

DATETIME FROM_SECOND(BIGINT unix_timestamp) DATETIME FROM_MILLISECOND(BIGINT unix_timestamp) DATETIME FROM_MICROSECOND(BIGINT unix_timestamp)

将时间戳转化为对应的 DATETIME，传入的是整型，返回的是DATETIME类型。若unix_timestamp < 0 或函数结果大于 9999-12-31 23:59:59.999999，则返回NULL。

example

mysql> set time_zone='Asia/Shanghai';
mysql> select from_second(-1);
+---------------------------+
| from_second(-1)           |
+---------------------------+
| NULL                      |
+---------------------------+
mysql> select from_millisecond(12345678);
+----------------------------+
| from_millisecond(12345678) |
+----------------------------+
| 1970-01-01 11:25:45.678    |
+----------------------------+
mysql> select from_microsecond(253402271999999999);
+--------------------------------------+
| from_microsecond(253402271999999999) |
+--------------------------------------+
| 9999-12-31 23:59:59.999999           |
+--------------------------------------+
mysql> select from_microsecond(253402272000000000);
+--------------------------------------+
| from_microsecond(253402272000000000) |
+--------------------------------------+
| NULL                                 |
+--------------------------------------+

keywords

FROM_SECOND,FROM,SECOND,MILLISECOND,MICROSECOND