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

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

    DatePeriod::INCLUDE_END_DATE

    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
    8.2.0 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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    User Contributed Notes 1 note

    up
    22
    mail at pascalhofmann dot de
    7 years ago
    When looping over a DatePeriod object, the returned objects always implement DateTimeInterface. The exact type returned depends on how the DatePeriod was created. If $start was a DateTimeImmutable, the objects returned will be of type DateTimeImmutable. If a DateTime object was used, the objects returned will be of type DateTime.
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