(PHP 5 >= 5.6.5, PHP 7, PHP 8)
DatePeriod::getStartDate — Gets the start date
Object-oriented style
public DatePeriod::getStartDate(): DateTimeInterface
Gets the start date of the period.
This function has no parameters.
Returns a DateTimeImmutable object when the DatePeriod is initialized with a DateTimeImmutable object as the start parameter.
Example #1 DatePeriod::getStartDate() example
<?php
$period = DatePeriod::createFromIso8601String('R7/2016-05-16T00:00:00Z/P1D');
$start = $period->getStartDate();
echo $start->format(DateTime::ISO8601); The above example will output:
2016-05-16T00:00:00+0000
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https://www.php.net/manual/en/dateperiod.getstartdate.php