Date Range

Implementation of the Date Range missing in PHP.

Install

Using Composer

composer require zeeproject/date-range

Usage

DateRange - value object

Instantiating value object and accessing properties:

$range = new DateRange(new DateTime('-1 day'), new DateTime('+1 day'));
// Checking if range has start date
$range->hasStartDate();
// Accessing range start date
$range->getStartDate()->format('c');
// Checking if range has end date
$range->hasEndDate();
// Accessing range end date
$range->getEndDate()->format('c');
// Checking if range is finite
$range->isFinite();
// Checking if range already started
$range->isStarted();
// Checking if range already ended
$range->isEnded();
// Checking if range started on specific date
$range->isStartedOn(new DateTime());
// Checking if range ended on specific date
$range->isEndedOn(new DateTime());
// Accessing range duration in seconds
$range->getTimestampInterval();
// Accessing range interval
$range->getDateInterval()->format('%s');
// Printing
echo $range;
// Representing as JSON
json_encode($range);

Iterating over the range:

$range = new DateRange(new DateTime('-1 day'), new DateTime('+1 day'));

foreach ($range->getDatePeriod(new DateInterval('P1D')) as $date) {
    echo $date->format('Y-m-d');
}

Splitting range into smaller ranges:

$range = new DateRange(new DateTime('-1 day'), new DateTime('+1 day'));

foreach ($range->split(new DateInterval('P1D')) as $range) {
    echo $range;
}

Date range is immutable, any changes resulting to new object:

$initial = new DateRange(new DateTime('-1 day'), new DateTime('+1 day'));
$actual = $initial->setStartDate(new DateTime('now'));
if ($initial === $actual) {
    throw new LogicException('Oh, ah');
}

DateRangeProvider - the date ranges builder.

Using builder to create new range with specific rules:

class RangeForYear implements DateRangeProvider
{
    /**
     * @var int
     */
    private $year;

    /**
     * @param int $year
     */
    public function __construct(int $year)
    {
        $this->year = $year;
    }

    public function getDateRange(): DateRangeInterface
    {
        return new DateRange(
            new DateTimeImmutable(DateTimeImmutable::createFromFormat('c', "{$this->year}-01-01T00:00:00Z")),
            new DateTimeImmutable(DateTimeImmutable::createFromFormat('c', "{$this->year}-12-31T23:59:59Z"))
        );
    }
}

Your classes might depend on range provider instead of DateRange, useful when predefined ranges are more meaningful than range interface:

class ReportCalculator
{
    public function calculate(DateRangeProvider $provider)
    {
        echo $provider->getDateRange();
    }
}

$calculator->calculate(new RangeForYear(2017));
$calculator->calculate(new RangeForQuarter(2017));
$calculator->calculate(new RangeForMonth(2017));

Even your class might require concrete range contract:

class ReportCalculator
{
    public function calculate(FiniteDateRangeProvider $provider)
    {
        echo $provider->getDateRange();
    }
}

Testing

phpunit

Contributing

Please see CONTRIBUTING and CODE OF CONDUCT for more details.