PHP date() format when inserting into datetime in MySQL

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This problem describes the date format for inserting the date into MySQL database. MySQL retrieves and displays DATETIME values in ‘YYYY-MM-DD HH:MM:SS’ format. The date can be stored in this format only. However, it can be used with any time format functions to change it and display it.

When writing a query in MySQL using PHP it’s applicability will be checked on the basis of MySQL itself. So use default date and time format as provided by MySQL i.e. ‘YYYY-MM-DD’

Examples:

DATE: YYYY-MM-DD
Example: 2005-12-26

DATETIME: YYYY-MM-DD HH:MI:SS
Example: 2005-12-26 23:50:30

TIMESTAMP: YYYY-MM-DD HH:MI:SS
Example: 2005-12-26 23:50:30

YEAR: YYYY or YY

MySQL query to create DataBase:

CREATE DATABASE Date_time_example;

Example 1: PHP program to Create database and table

php

<?php 
  
$servername = "localhost"; 
$username = "root"; 
$password = ""; 
$dbname = "zambiatek"; 
  
// Create connection 
$conn = mysqli_connect( $servername, $username, $password, $dbname ); 
  
// Check connection 
if ( !$conn ) { 
    die("Connection failed: " . mysqli_connect_error()); 
} 
  
// SQL query to create table 
$sql = "CREATE TABLE date_test ( 
    id INT AUTO_INCREMENT PRIMARY KEY, 
    created_at DATETIME 
)"; 
  
if (mysqli_query($conn, $sql)) { 
    echo "Table date_test created successfully"; 
} else { 
    echo "Error creating table: " . mysqli_error($conn); 
} 
  
// Close connection 
mysqli_close($conn); 
?> 

Output:

Table date_test created successfully

Example 2: PHP program to insert date into the table.

php

<?php 
  
$servername = "localhost"; 
$username = "root"; 
$password = ""; 
$dbname = "zambiatek"; 
  
// Create connection 
$conn = mysqli_connect( $servername, $username, $password, $dbname ); 
  
// Check connection 
if ( !$conn ) { 
    die("Connection failed: " . mysqli_connect_error()); 
} 
  
// SQL query to insert data into table 
$sql = "INSERT INTO date_test( created_at )  
        VALUES( '2018-12-05 12:39:16' );"; 
  
if (mysqli_query($conn, $sql)) { 
    echo "New record created successfully"; 
} else { 
    echo "Error: " . $sql . "<br>" . mysqli_error($conn); 
} 
  
// Close connection 
mysqli_close($conn); 
?> 

Output:

New record created successfully

Example 3: This example is used to display which row created on 2018-12-05. Use the following query to display result.
The created_at column contains not only date but also time. So it will display error message.

SELECT * FROM date_test WHERE created_at = '2018-12-05';

Output:

(!Important) Wrong Query It returns no rows

Correct Query: To correct it, use the DATE function as follows:

SELECT * FROM date_test WHERE DATE( created_at ) = '2018-12-05';

php

<?php 
  
$servername = "localhost"; 
$username = "root"; 
$password = ""; 
$dbname = "zambiatek"; 
  
// Create connection 
$conn = mysqli_connect( $servername, $username, $password, $dbname ); 
  
// Check connection 
if ( !$conn ) { 
    die("Connection failed: " . mysqli_connect_error()); 
} 
  
// SQL query  
$sql = "SELECT * FROM date_test 
WHERE DATE(created_at) = '2018-12-05'"; 
  
$result = mysqli_query( $conn, $sql );  
  
if ($result) { 
    echo $result; //printing Query result 
}  
else { 
    echo "Error: " . $sql . "<br>" . mysqli_error($conn); 
} 
  
// Close connection 
mysqli_close($conn); 
?> 

Output:

To get the year, quarter, month, week, day, hour, minute, and second from a DATETIME value, use the functions as shown in the following statement:
HOUR(@dt), MINUTE(@dt), SECOND(@dt), DAY(@dt), WEEK(@dt), MONTH(@dt), QUARTER(@dt), YEAR(@dt);

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