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Sure, here are some examples of how to create a DateTimeImmutable object on a monthly basis:

1. Creating a DateTimeImmutable object for the current month:

$now = new DateTimeImmutable();
$month = $now->format('Y-m-d');
echo $month;
// Output: 2022-12-01

1. Creating a DateTimeImmutable object for a specific month:

$date = new DateTimeImmutable('2023-01-01');
$month = $date->format('Y-m-d');
echo $month;
// Output: 2023-01-01

1. Creating a DateTimeImmutable object for the last day of the current month:

$last_day_of_month = new DateTimeImmutable('last day of this month');
$month = $last_day_of_month->format('Y-m-d');
echo $month;
// Output: 2022-12-31

1. Creating a DateTimeImmutable object for the first day of next month:

$first_day_of_next_month = new DateTimeImmutable('first day of next month');
$month = $first_day_of_next_month->format('Y-m-d');
echo $month;
// Output: 2023-01-01