W3cubDocs

/MariaDB

FROM_UNIXTIME

Syntax

FROM_UNIXTIME(unix_timestamp), FROM_UNIXTIME(unix_timestamp,format)

Description

Returns a representation of the unix_timestamp argument as a value in 'YYYY-MM-DD HH:MM:SS' or YYYYMMDDHHMMSS.uuuuuu format, depending on whether the function is used in a string or numeric context. The value is expressed in the current time zone. unix_timestamp is an internal timestamp value such as is produced by the UNIX_TIMESTAMP() function.

If format is given, the result is formatted according to the format string, which is used the same way as listed in the entry for the DATE_FORMAT() function.

Timestamps in MariaDB have a maximum value of 2147483647, equivalent to 2038-01-19 05:14:07. This is due to the underlying 32-bit limitation. Using the function on a timestamp beyond this will result in NULL being returned. Use DATETIME as a storage type if you require dates beyond this.

The options that can be used by FROM_UNIXTIME(), as well as DATE_FORMAT() and STR_TO_DATE(), are:

Option Description
%a Short weekday name in current locale (Variable lc_time_names).
%b Short form month name in current locale. For locale en_US this is one of: Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov or Dec.
%c Month with 1 or 2 digits.
%D Day with English suffix 'th', 'nd', 'st' or 'rd''. (1st, 2nd, 3rd...).
%d Day with 2 digits.
%e Day with 1 or 2 digits.
%f Sub seconds 6 digits.
%H Hour with 2 digits between 00-23.
%h Hour with 2 digits between 01-12.
%I Hour with 2 digits between 01-12.
%i Minute with 2 digits.
%j Day of the year (001-366)
%k Hour with 1 digits between 0-23.
%l Hour with 1 digits between 1-12.
%M Full month name in current locale (Variable lc_time_names).
%m Month with 2 digits.
%p AM/PM according to current locale (Variable lc_time_names).
%r Time in 12 hour format, followed by AM/PM. Short for '%I:%i:%S %p'.
%S Seconds with 2 digits.
%s Seconds with 2 digits.
%T Time in 24 hour format. Short for '%H:%i:%S'.
%U Week number (00-53), when first day of the week is Sunday.
%u Week number (00-53), when first day of the week is Monday.
%V Week number (01-53), when first day of the week is Sunday. Used with %X.
%v Week number (01-53), when first day of the week is Monday. Used with %x.
%W Full weekday name in current locale (Variable lc_time_names).
%w Day of the week. 0 = Sunday, 1 = Saturday.
%X Year with 4 digits when first day of the week is Sunday. Used with %V.
%x Year with 4 digits when first day of the week is Sunday. Used with %v.
%Y Year with 4 digits.
%y Year with 2 digits.
%# For str_to_date(), skip all numbers.
%. For str_to_date(), skip all punctation characters.
%@ For str_to_date(), skip all alpha characters.
%% A literal % character.

Performance Considerations

If your session time zone is set to SYSTEM (the default), FROM_UNIXTIME() will call the OS function to convert the data using the system time zone. At least on Linux, the corresponding function (localtime_r) uses a global mutex inside glibc that can cause contention under high concurrent load.

Set your time zone to a named time zone to avoid this issue. See mysql time zone tables for details on how to do this.

Examples

SELECT FROM_UNIXTIME(1196440219);
+---------------------------+
| FROM_UNIXTIME(1196440219) |
+---------------------------+
| 2007-11-30 11:30:19       |
+---------------------------+

SELECT FROM_UNIXTIME(1196440219) + 0;
+-------------------------------+
| FROM_UNIXTIME(1196440219) + 0 |
+-------------------------------+
|         20071130113019.000000 |
+-------------------------------+

SELECT FROM_UNIXTIME(UNIX_TIMESTAMP(), '%Y %D %M %h:%i:%s %x');
+---------------------------------------------------------+
| FROM_UNIXTIME(UNIX_TIMESTAMP(), '%Y %D %M %h:%i:%s %x') |
+---------------------------------------------------------+
| 2010 27th March 01:03:47 2010                           |
+---------------------------------------------------------+

See Also

Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.

© 2019 MariaDB
Licensed under the Creative Commons Attribution 3.0 Unported License and the GNU Free Documentation License.
https://mariadb.com/kb/en/from_unixtime/