easter_date

easter_date

Get Unix timestamp for local midnight on Easter of a given year

int **easter_date**  $year int $mode

Returns the Unix timestamp corresponding to midnight on Easter of the given year.

The date of Easter Day was defined by the Council of Nicaea in AD325 as the Sunday after the first full moon which falls on or after the Spring Equinox. The Equinox is assumed to always fall on 21st March, so the calculation reduces to determining the date of the full moon and the date of the following Sunday. The algorithm used here was introduced around the year 532 by Dionysius Exiguus. Under the Julian Calendar (for years before 1753) a simple 19-year cycle is used to track the phases of the Moon. Under the Gregorian Calendar (for years after 1753 - devised by Clavius and Lilius, and introduced by Pope Gregory XIII in October 1582, and into Britain and its then colonies in September 1752) two correction factors are added to make the cycle more accurate.

yearThe year must be a number between 1970 and 2037 for 32-bit systems, or between 1970 and 2,000,000,000 for 64-bit systems. If omitted or null, defaults to the current year according to the local time.

mode Allows Easter dates to be calculated based on the Julian calendar when set to . See also . CAL_EASTER_ALWAYS_JULIANcalendar constants

The easter date as a unix timestamp.

A is thrown if the year is earlier than 1970 or later than 2037 when running on a 32-bit system, or later than 2,000,000,000 on a 64-bit system. ValueError

Voorbeeld: example

<?php

echo date("M-d-Y", easter_date(1999));        // Apr-04-1999
echo date("M-d-Y", easter_date(2000));        // Apr-23-2000
echo date("M-d-Y", easter_date(2001));        // Apr-15-2001

?>

**Voorbeeld: Using with **

<?php

$timestamp = easter_date(2023);

$datetime = new \DateTime();
$datetime->setTimestamp($timestamp);

echo $datetime->format('M-d-Y'); // Apr-09-2023

?>

Opmerking: > relies on your system's C library time functions, rather than using PHP's internal date and time functions. As a consequence, uses the environment variable to determine the time zone it should operate in, rather than using PHP's , which may result in unexpected behaviour when using this function in conjunction with other date functions in PHP. easter_date``easter_date``TZdefault time zone

As a workaround, you can use the  with
 and  to
calculate the start of Easter in your PHP time zone as follows:

easter_days``DateTime``DateInterval

<?php
function get_easter_datetime($year) {
    $base = new DateTime("$year-03-21");
    $days = easter_days($year);

    return $base->add(new DateInterval("P{$days}D"));
}

foreach (range(2012, 2015) as $year) {
    printf("Easter in %d is on %s\n",
           $year,
           get_easter_datetime($year)->format('F j'));
}
?>

Easter in 2012 is on April 8
Easter in 2013 is on March 31
Easter in 2014 is on April 20
Easter in 2015 is on April 5

easter_days