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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:

OptionDescription
%aShort weekday name in current locale (Variable lc_time_names).
%bShort 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.
%cMonth with 1 or 2 digits.
%DDay with English suffix 'th', 'nd', 'st' or 'rd''. (1st, 2nd, 3rd...).
%dDay with 2 digits.
%eDay with 1 or 2 digits.
%fMicroseconds 6 digits.
%HHour with 2 digits between 00-23.
%hHour with 2 digits between 01-12.
%IHour with 2 digits between 01-12.
%iMinute with 2 digits.
%jDay of the year (001-366)
%kHour with 1 digits between 0-23.
%lHour with 1 digits between 1-12.
%MFull month name in current locale (Variable lc_time_names).
%mMonth with 2 digits.
%pAM/PM according to current locale (Variable lc_time_names).
%rTime in 12 hour format, followed by AM/PM. Short for '%I:%i:%S %p'.
%SSeconds with 2 digits.
%sSeconds with 2 digits.
%TTime in 24 hour format. Short for '%H:%i:%S'.
%UWeek number (00-53), when first day of the week is Sunday.
%uWeek number (00-53), when first day of the week is Monday.
%VWeek number (01-53), when first day of the week is Sunday. Used with %X.
%vWeek number (01-53), when first day of the week is Monday. Used with %x.
%WFull weekday name in current locale (Variable lc_time_names).
%wDay of the week. 0 = Sunday, 6 = Saturday.
%XYear with 4 digits when first day of the week is Sunday. Used with %V.
%xYear with 4 digits when first day of the week is Sunday. Used with %v.
%YYear with 4 digits.
%yYear 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.

MariaDB starting with 11.7

From MariaDB 11.7, FROM_UNIXTIME(0) now returns NULL instead of '1970-01-01 00:00:00' (assuming time_zone='+00:00'). See MDEV-15751.

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

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