Using PHP date() Function to Format Dates and Times

PHP is a widely used server‑side language for web development that provides powerful date and time handling capabilities. The date() function is a commonly used built‑in function that returns the current date and time or a specified timestamp.

The syntax of date() is: date(format,timestamp) The format argument is required and defines the output format, while the optional timestamp argument specifies a Unix timestamp; if omitted, the current date and time are used.

The following code examples demonstrate various ways to use date():

<?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");
echo "<br>";

// 3. Return current time
echo date("H:i:s");
echo "<br>";

// 4. Return year
echo date("Y");
echo "<br>";

// 5. Return month
echo date("m");
echo "<br>";

// 6. Return day
echo date("d");
echo "<br>";

// 7. Return weekday
echo date("l");
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);
echo "<br>";

// 9. Convert a date 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);
echo "<br>";
?>

These examples show how different format strings produce outputs such as the full date and time, year, month, day, and weekday.

The date() function supports many format characters; refer to the official PHP documentation for a complete list.

Because date() returns a string, it can be output directly with echo.

In summary, the PHP date() function is a versatile tool for obtaining and formatting date and time information, making it indispensable in web development.

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