The DatePeriod class

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

Introduction

Represents a date period.

A date period allows iteration over a set of dates and times, recurring at regular intervals, over a given period.

Class synopsis

class DatePeriod implements IteratorAggregate {
/* Constants */
public const int EXCLUDE_START_DATE;
public const int INCLUDE_END_DATE;
/* Properties */
public readonly ?DateTimeInterface $start;
public readonly ?DateTimeInterface $current;
public readonly ?DateTimeInterface $end;
public readonly ?DateInterval $interval;
public readonly int $recurrences;
public readonly bool $include_start_date;
public readonly bool $include_end_date;
/* Methods */
public __construct(
    DateTimeInterface $start,
    DateInterval $interval,
    int $recurrences,
    int $options = 0
)
public __construct(
    DateTimeInterface $start,
    DateInterval $interval,
    DateTimeInterface $end,
    int $options = 0
)
public __construct(string $isostr, int $options = 0)
public static createFromISO8601String(string $specification, int $options = 0): static
public getDateInterval(): DateInterval
public getEndDate(): ?DateTimeInterface
public getRecurrences(): ?int
public getStartDate(): DateTimeInterface
}

Predefined Constants

DatePeriod::EXCLUDE_START_DATE int

Exclude start date, used in DatePeriod::__construct().

DatePeriod::INCLUDE_END_DATE int

Include end date, used in DatePeriod::__construct().

Properties

recurrences

The minimum amount of instances as retured by the iterator.

If the number of recurrences has been explicitly passed through the recurrences parameter in the constructor of the DatePeriod instance, then this property contains this value, plus one if the start date has not been disabled through DatePeriod::EXCLUDE_START_DATE, plus one if the end date has been enabled through DatePeriod::INCLUDE_END_DATE.

If the number of recurrences has not been explicitly passed, then this property contains the minimum number of returned instances. This would be 0, plus one if the start date has not been disabled through DatePeriod::EXCLUDE_START_DATE, plus one if the end date has been enabled through DatePeriod::INCLUDE_END_DATE.

<?php
$start = new DateTime('2018-12-31 00:00:00');
$end = new DateTime('2021-12-31 00:00:00');
$interval = new DateInterval('P1M');
$recurrences = 5;

// recurrences explicitly set through the constructor
$period = new DatePeriod($start, $interval, $recurrences, DatePeriod::EXCLUDE_START_DATE);
echo $period->recurrences, "\n";

$period = new DatePeriod($start, $interval, $recurrences);
echo $period->recurrences, "\n";

$period = new DatePeriod($start, $interval, $recurrences, DatePeriod::INCLUDE_END_DATE);
echo $period->recurrences, "\n";

// recurrences not set in the constructor
$period = new DatePeriod($start, $interval, $end);
echo $period->recurrences, "\n";

$period = new DatePeriod($start, $interval, $end, DatePeriod::EXCLUDE_START_DATE);
echo $period->recurrences, "\n";
?>

The above example will output:


5
6
7
1
0

See also DatePeriod::getRecurrences().

include_end_date

Whether to include the end date in the set of recurring dates or not.

include_start_date

Whether to include the start date in the set of recurring dates or not.

start

The start date of the period.

current

During iteration this will contain the current date within the period.

end

The end date of the period.

interval

An ISO 8601 repeating interval specification.

Changelog

Version Description
8.4.0 The class constants are now typed.
8.2.0 The DatePeriod::INCLUDE_END_DATE constant and include_end_date property have been added.
8.0.0 DatePeriod implements IteratorAggregate now. Previously, Traversable was implemented instead.

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