DatePeriod::__construct

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

DatePeriod::__construct — Creates a new DatePeriod object

Description

public DatePeriod::__construct(
    DateTimeInterface $start,
    DateInterval $interval,
    int $recurrences,
    int $options = 0
)
public DatePeriod::__construct(
    DateTimeInterface $start,
    DateInterval $interval,
    DateTimeInterface $end,
    int $options = 0
)
public DatePeriod::__construct(string $isostr, int $options = 0)

Creates a new DatePeriod object.

DatePeriod objects can be used as an iterator to generate a number of DateTimeImmutable or DateTime object from a start date, a interval, and an end date or the number of recurrences.

The class of returned objects is equivalent to the DateTimeImmutable or DateTime ancestor class of the start object.

Parameters

start

The start date of the period. Included by default in the result set.

interval

The interval between recurrences within the period.

recurrences

The number of recurrences. The number of returned results is one higher than this, as the start date is included in the result set by default. Must be greater than 0.

end

The end date of the period. Excluded by default from the result set.

isostr

A subset of the » ISO 8601 repeating interval specification.

Examples of some ISO 8601 interval specification features that PHP does not support are:

  1. zero occurrences (R0/)
  2. time offsets other than UTC (Z), such as +02:00.
options

A bit field which can be used to control certain behaviour with start- and end- dates.

With DatePeriod::EXCLUDE_START_DATE you exclude the start date from the set of recurring dates within the period.

With DatePeriod::INCLUDE_END_DATE you include the end date in the set of recurring dates within the period.

Changelog

Version Description
8.2.0 The DatePeriod::INCLUDE_END_DATE constant has been added.
7.2.19, 7.3.6, 7.4.0 recurrences must be greater than 0 now.

Examples

Example #1 DatePeriod example

<?php
$start = new DateTime('2012-07-01');
$interval = new DateInterval('P7D');
$end = new DateTime('2012-07-31');
$recurrences = 4;
$iso = 'R4/2012-07-01T00:00:00Z/P7D';

// All of these periods are equivalent.
$period = new DatePeriod($start, $interval, $recurrences);
$period = new DatePeriod($start, $interval, $end);
$period = new DatePeriod($iso);

// By iterating over the DatePeriod object, all of the
// recurring dates within that period are printed.
foreach ($period as $date) {
echo $date->format('Y-m-d')."\n";
}
?>

The above example will output:

2012-07-01
2012-07-08
2012-07-15
2012-07-22
2012-07-29

Example #2 DatePeriod example with DatePeriod::EXCLUDE_START_DATE

<?php
$start = new DateTime('2012-07-01');
$interval = new DateInterval('P7D');
$end = new DateTime('2012-07-31');

$period = new DatePeriod($start, $interval, $end,
DatePeriod::EXCLUDE_START_DATE);

// By iterating over the DatePeriod object, all of the
// recurring dates within that period are printed.
// Note that, in this case, 2012-07-01 is not printed.
foreach ($period as $date) {
echo $date->format('Y-m-d')."\n";
}
?>

The above example will output:

2012-07-08
2012-07-15
2012-07-22
2012-07-29

Example #3 DatePeriod example showing all last Thursdays in a year

<?php
$begin = new DateTime('2021-12-31');
$end = new DateTime('2022-12-31 23:59:59');

$interval = DateInterval::createFromDateString('last thursday of next month');
$period = new DatePeriod($begin, $interval, $end, DatePeriod::EXCLUDE_START_DATE);

foreach ($period as $dt) {
echo $dt->format('l Y-m-d'), "\n";
}
?>

The above example will output:

Thursday 2022-01-27
Thursday 2022-02-24
Thursday 2022-03-31
Thursday 2022-04-28
Thursday 2022-05-26
Thursday 2022-06-30
Thursday 2022-07-28
Thursday 2022-08-25
Thursday 2022-09-29
Thursday 2022-10-27
Thursday 2022-11-24
Thursday 2022-12-29

Notes

Unbound numbers of repetitions as specified by ISO 8601 section 4.5 "Recurring time interval" are not supported, i.e. neither passing "R/..." as isostr nor passing null as end would work.