docs/sql-manual/sql-functions/date-time-functions/from-second.md

---
{
    "title": "FROM_SECOND",
    "language": "en"
}
---

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## 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