date math fun

gistfile1.txt

[1] boris> $period = new DatePeriod(new DateTime('2015-01-31'), new DateInterval('P1M'), 50);
// object(DatePeriod)(
//   'start' => object(DateTime)(
//     'date' => '2015-01-31 00:00:00.000000',
//     'timezone_type' => 3,
//     'timezone' => 'America/New_York'
//   ),
//   'current' => NULL,
//   'end' => NULL,
//   'interval' => object(DateInterval)(
//     'y' => 0,
//     'm' => 1,
//     'd' => 0,
//     'h' => 0,
//     'i' => 0,
//     's' => 0,
//     'weekday' => 0,
//     'weekday_behavior' => 0,
//     'first_last_day_of' => 0,
//     'invert' => 0,
//     'days' => false,
//     'special_type' => 0,
//     'special_amount' => 0,
//     'have_weekday_relative' => 0,
//     'have_special_relative' => 0
//   ),
//   'recurrences' => 51,
//   'include_start_date' => true
// )
[2] boris> foreach ($period as $thing) { print $thing->format('Y-m-d') . PHP_EOL; }
2015-01-31
2015-03-03
2015-04-03
2015-05-03
2015-06-03
2015-07-03
2015-08-03
2015-09-03
2015-10-03
2015-11-03
2015-12-03
2016-01-03
2016-02-03
2016-03-03
2016-04-03
2016-05-03
2016-06-03
2016-07-03
2016-08-03
2016-09-03
2016-10-03
2016-11-03
2016-12-03
2017-01-03
2017-02-03
2017-03-03
2017-04-03
2017-05-03
2017-06-03
2017-07-03
2017-08-03
2017-09-03
2017-10-03
2017-11-03
2017-12-03
2018-01-03
2018-02-03
2018-03-03
2018-04-03
2018-05-03
2018-06-03
2018-07-03
2018-08-03
2018-09-03
2018-10-03
2018-11-03
2018-12-03
2019-01-03
2019-02-03
2019-03-03
2019-04-03