Using PHP date() Function to Format Dates and Times

PHP is a widely used server‑side language that provides powerful date and time handling. The date() function returns the current date and time or a specified timestamp.

The syntax is date(format, timestamp) , where format is required and timestamp is optional; if omitted, the current time is used.

Common format strings include:

Y-m-d H:i:s – full date and time

Y-m-d – date only

H:i:s – time only

Y – year

m – month

d – day

l – weekday name

Example code demonstrating these usages:

<?php
// 1. Return current date and time
echo date("Y-m-d H:i:s"); // e.g., 2022-10-31 19:30:15
echo "<br>";

// 2. Return current date
echo date("Y-m-d"); // e.g., 2022-10-31
echo "<br>";

// 3. Return current time
echo date("H:i:s"); // e.g., 19:30:15
echo "<br>";

// 4. Return year
echo date("Y"); // e.g., 2022
echo "<br>";

// 5. Return month
echo date("m"); // e.g., 10
echo "<br>";

// 6. Return day
echo date("d"); // e.g., 31
echo "<br>";

// 7. Return weekday name
echo date("l"); // e.g., Monday
echo "<br>";

// 8. Use a timestamp to get a specific date and time
$timestamp = mktime(10, 30, 0, 12, 25, 2022);
echo date("Y-m-d H:i:s", $timestamp); // e.g., 2022-12-25 10:30:00
echo "<br>";

// 9. Convert a time string to a timestamp and format it
$time_str = "2022-12-25 10:30:00";
$timestamp = strtotime($time_str);
echo date("Y-m-d H:i:s", $timestamp); // e.g., 2022-12-25 10:30:00
echo "<br>";
?>

The date() function returns a string, so it can be directly output with echo . By choosing appropriate format strings, developers can obtain any required date or time information, making the function a flexible and essential tool in PHP web development.