MySQL datetime format code example

Example 1: mysql timestamp to date

-- Use the FROM_UNIXTIME() function in MySQL
select from_unixtime(timestamp) from my_tbl;

Example 2: mysql format date

DATE_FORMAT(date, format)
-- E.g.
SELECT DATE_FORMAT(dateField, '%m/%d/%Y') FROM TableName;
-- See https://www.mysqltutorial.org/mysql-date_format/ for available formats

Example 3: mysql date format

-- Converts 'dd.mm.yyyy' to date	(my_date_col is VARCHAR)
SELECT STR_TO_DATE(my_date_col,'%d.%m.%Y') AS my_strdate FROM my_table;
-- Converts 'dd.mm.yyyy' to 'YYYY-MM-DD'
SELECT DATE_FORMAT(STR_TO_DATE(my_date_col,'%d.%m.%Y'), '%Y-%m-%d') AS my_strdate
	FROM my_table;

Example 4: MySQL datetime format

use \Datetime;

$now = new DateTime();
echo $now->format('Y-m-d H:i:s');    // MySQL datetime format
echo $now->getTimestamp();           // Unix Timestamp -- Since PHP 5.3

Example 5: format time mysql

-- use DATE_FORMAT with %H %i
-- SELECT DATE_FORMAT(MemberBookFacility.time, '%H:%i')
"45": "09:00",
"24": "10:00",
"42": "11:00",
"48": "12:00",

-- ONcakephp must use below format
$this->virtualFields['time'] = "DATE_FORMAT(MemberBookFacility.time, '%H:%i')";	// using this for use concat
	
		return $this->find('list', array(
          'conditions' => $conditions,
          'fields' => array(
            'MemberBookFacility.id', 
            'time',
          ),
          'order' => array(
            'MemberBookFacility.time ASC',
          ),
        ));

Example 6: date vs datetime

DATE : YYYY-MM-DD format
DATETIME : YYYY-MM-DD HH:MM:SS format
TIMESTAMP : X s from 1970 format
TIME : HH:MM:SS format