from_second
description
syntax
DATETIME FROM_SECOND(BIGINT unix_timestamp)
DATETIME FROM_MILLISECOND(BIGINT unix_timestamp)
DATETIME FROM_MICROSECOND(BIGINT unix_timestamp)
Converts a timestamp to its DATETIME represent, with argument as an integer and returned as a DATETIME type. Returns NULL if unix_timestamp < 0 or if the function result is greater than 9999-12-31 23:59:59.999999.
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