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Period is PHP’s missing time range API. Based on ideas from Resolving Feature Envy in the Domain by Mathias Verraes, this package extends the concept to cover all basic operations regarding time ranges.

In your code, you will always have to typehint against the League\Period\Period class directly because it is a immutable value object class marked as final and the library does not provide an interface.

Since version 4.1 a League\Period\Sequence class is added to improve manipulating a collection of Period objects.

Since version 4.4 the Period objects supports all types of boundary with the exception of unbounded interval.

Since version 4.10 support for PHP 7.1 is dropped.

Accessing the interval properties

use League\Period\Period;

$interval = new Period(
    new DateTime('2014-10-03 08:12:37'),
    new DateTimeImmutable('2014-10-03 08:12:37')
$start = $interval->getStartDate(); //returns a DateTimeImmutable
$end = $interval->getEndDate();     //returns a DateTimeImmutable
$duration = $interval->getDateInterval();       //returns a DateInterval object
$duration2 = $interval->getTimestampInterval(); //returns the duration in seconds
echo $interval; //displays '2014-10-03T08:12:37Z/2014-10-03T09:12:37Z'

Learn more about how this all works in the basic usage.

Iterate over the interval

A simple example on how to get all the days from a selected month.

foreach (Period::fromMonth(2014, 10)->getDatePeriod('1 DAY') as $day) {

To help easily instantiate your time range and manipulating it, the package comes bundle with named constructors and helper classes.

Comparing intervals

$period = Period::after('2014-01-01', '1 MONTH', Period::INCLUDE_ALL);
$altPeriod = Period::after('2014-01-01', '1 MONTH', Period::EXCLUDE_ALL);
$period->durationEquals($altPeriod), //returns true
$period->equals($altPeriod), //returns false
$period->contains($altPeriod), //returns true
$altPeriod->contains($period), //return false
$period->contains('2014-01-10'), //returns true
Datepoint::create('2014-02-10')->isDuring($period) //returns false

The class comes with other ways to compare time ranges based on their duration and/or their datepoints.
Datepoint extends DateTimeImmutable and offers more methods.

Modifying interval

$period = Period::after('2014-01-01', '1 WEEK');
$altPeriod = $period->endingOn('2014-02-03');
$period->contains($altPeriod); //return false;
$altPeriod->durationGreaterThan($period); //return true;

Period is an immutable value object. Any changes to the object returns a new object. The class has more modifying methods.

Accessing all gaps between intervals

$sequence = new Sequence(
    new Period('2018-01-01', '2018-01-31'),
    new Period('2017-01-01', '2017-01-31'),
    new Period('2020-01-01', '2020-01-31')
$gaps = $sequence->gaps(); // a new Sequence object
count($gaps); // 2

Sequence is a Period container and collection. The class has more methods.