Syntax
------ 
TIME [()]
 
Description
----------- 
A time. The range is '-838:59:59.999999' to
'838:59:59.999999'. Microsecond precision can be from 0-6;
if not specified 0 is used. Microseconds have been available
since MariaDB 5.3. 
 
MariaDB displays TIME values in 'HH:MM:SS.ssssss' format,
but allows assignment of times in looser formats, including
'D HH:MM:SS', 'HH:MM:SS', 'HH:MM', 'D HH:MM', 'D
HH', 'SS', or 'HHMMSS', as well as permitting dropping
of any leading zeros when a delimiter is provided, for
example '3:9:10'. For details, see date and time literals.
 
MariaDB 10.1.2 introduced the --mysql56-temporal-format
option, on by default, which allows MariaDB to store TIMEs
using the same low-level format MySQL 5.6 uses.
 
Internal Format
 
In MariaDB 10.1.2 a new temporal format was introduced from
MySQL 5.6 that alters how the TIME, DATETIME and TIMESTAMP
columns operate at lower levels. These changes allow these
temporal data types to have fractional parts and negative
values. You can disable this feature using the
mysql56_temporal_format system variable.
 
Tables that include TIMESTAMP values that were created on an
older version of MariaDB or that were created while the
mysql56_temporal_format system variable was disabled
continue to store data using the older data type format.
 
In order to update table columns from the older format to
the newer format, execute an ALTER TABLE... MODIFY COLUMN
statement that changes the column to the *same* data type.
This change may be needed if you want to export the table's
tablespace and import it onto a server that has
mysql56_temporal_format=ON set (see MDEV-15225).
 
For instance, if you have a TIME column in your table: 
 
SHOW VARIABLES LIKE 'mysql56_temporal_format';
 
+-------------------------+-------+
| Variable_name | Value |
+-------------------------+-------+
| mysql56_temporal_format | ON |
+-------------------------+-------+
 
ALTER TABLE example_table MODIFY ts_col TIME;
 
When MariaDB executes the ALTER TABLE statement, it converts
the data from the older temporal format to the newer one. 
 
In the event that you have several tables and columns using
temporal data types that you want to switch over to the new
format, make sure the system variable is enabled, then
perform a dump and restore using mysqldump. The columns
using relevant temporal data types are restored using the
new temporal format.
 
Examples
-------- 
INSERT INTO time VALUES ('90:00:00'), ('800:00:00'),
(800), (22), (151413), ('9:6:3'), ('12 09');
 
SELECT * FROM time;
+-----------+
| t |
+-----------+
| 90:00:00 |
| 800:00:00 |
| 00:08:00 |
| 00:00:22 |
| 15:14:13 |
| 09:06:03 |
| 297:00:00 |
+-----------+
 


URL: https://mariadb.com/kb/en/time/