FROM_UNIXTIME

Description

The FROM_UNIXTIME function is used to convert a Unix timestamp (in seconds) to a date-time string or VARCHAR type value in a specified format. The reference time for Unix timestamps is 1970-01-01 00:00:00 UTC, and the function generates the corresponding date-time representation based on the input timestamp and format string.

This function behaves consistently with the from_unixtime function in MySQL

Syntax

FROM_UNIXTIME(<unix_timestamp> [, <string_format>])

Parameters

Parameter	Description
<unix_timestamp>	Input Unix timestamp, of integer type BIGINT, representing the number of seconds from 1970-01-01 00:00:00 UTC
<string_format>	Format string, supports varchar and string types, default is %Y-%m-%d %H:%i:%s. For specific formats, please refer to date-format

Return Value

Returns date in specified format, of type VARCHAR, returning the result of converting the UTC timezone unix timestamp to the current timezone time.

• Currently supported unix_timestamp range is [0, 253402271999] corresponding to dates from 1970-01-01 00:00:00 to 9999-12-31 23:59:59, unix_timestamp outside this range will return an error
• If string_format is invalid, returns a string that does not meet expectations.
• If any parameter is NULL, returns NULL
• If the format length is over 128 characters, returns error

Examples

----Since the current timezone is East 8th zone, the returned time is 8 hours ahead of UTC
select from_unixtime(0);
+---------------------+
| from_unixtime(0)    |
+---------------------+
| 1970-01-01 08:00:00 |
+---------------------+

---Default format %Y-%m-%d %H:%i:%s return
mysql> select from_unixtime(1196440219);
+---------------------------+
| from_unixtime(1196440219) |
+---------------------------+
| 2007-12-01 00:30:19       |
+---------------------------+

---Specify yyyy-MM-dd HH:mm:ss format return
mysql> select from_unixtime(1196440219, 'yyyy-MM-dd HH:mm:ss');
+--------------------------------------------------+
| from_unixtime(1196440219, 'yyyy-MM-dd HH:mm:ss') |
+--------------------------------------------------+
| 2007-12-01 00:30:19                              |
+--------------------------------------------------+


---Specify %Y-%m-%d date-only format return
mysql> select from_unixtime(1196440219, '%Y-%m-%d');
+-----------------------------------------+
| from_unixtime(1196440219, '%Y-%m-%d') |
+-----------------------------------------+
| 2007-12-01                              |
+-----------------------------------------+

---Specify %Y-%m-%d %H:%i:%s format return
mysql> select from_unixtime(1196440219, '%Y-%m-%d %H:%i:%s');
+--------------------------------------------------+
| from_unixtime(1196440219, '%Y-%m-%d %H:%i:%s') |
+--------------------------------------------------+
| 2007-12-01 00:30:19                              |
+--------------------------------------------------+

---Exceeds maximum range, returns error
select from_unixtime(253402281999);
ERROR 1105 (HY000): errCode = 2, detailMessage = (10.16.10.3)[INVALID_ARGUMENT]Operation from_unixtime_new of 253402281999, yyyy-MM-dd HH:mm:ss is invalid

---result over max length
select from_unixtime(32536799,repeat('a',129));
ERROR 1105 (HY000): errCode = 2, detailMessage = (10.16.10.3)[INVALID_ARGUMENT]Operation from_unixtime_new of invalid or oversized format is invalid

---string-format does not reference any time values
mysql> select from_unixtime(32536799,"gdaskpdp");
+------------------------------------+
| from_unixtime(32536799,"gdaskpdp") |
+------------------------------------+
| gdaskpdp                           |
+------------------------------------+

---Input is NULL, returns NULL
mysql> select from_unixtime(NULL);
+---------------------+
| from_unixtime(NULL) |
+---------------------+
| NULL                |
+---------------------+