Adjust Subscription Delay based on signup date

adjust-pmpro-subscription-delay.php

<?php
/**
 * Set the subscription profile_start_date to the 1st of a month.
 *
 * New signups: roughly one year from checkout, snapped to the 1st.
 * Renewals extended by the Auto-Renewal Checkbox Add On: keep the extended
 * start date it calculated, snapped to the 1st.
 *
 * NOTE: This is for yearly membership levels.
 */
function my_pmpro_set_annual_profile_start_date( $checkout_level ) {

	// Bail if the level isn't recurring. This also covers the case where the
	// Auto-Renewal Checkbox Add On has removed recurring billing because the
	// member left the auto-renew box unchecked.
	if ( ! pmpro_isLevelRecurring( $checkout_level ) ) {
		return $checkout_level;
	}

	if ( ! empty( $checkout_level->profile_start_date ) ) {
		// Another plugin already set a start date (e.g. the Auto-Renewal
		// Checkbox extending an existing membership). Keep that date, but
		// align it to the 1st-of-month rule.
		$checkout_level->profile_start_date = my_pmpro_snap_to_first_of_month( strtotime( $checkout_level->profile_start_date ) );
	} else {
		// New signup: one year from now, aligned to the 1st-of-month rule.
		$checkout_level->profile_start_date = my_pmpro_snap_to_first_of_month( strtotime( '+1 year', current_time( 'timestamp' ) ) );
	}

	add_filter( 'pmpro_level_cost_text', 'my_pmpro_annual_startdate_cost_text', 10, 2 );

	return $checkout_level;
}

add_filter( 'pmpro_checkout_level', 'my_pmpro_set_annual_profile_start_date', 99 );

// Show the updated anniversary date for their renewal
function my_pmpro_annual_startdate_cost_text( $cost, $level ) {

	if ( ! empty( $level->profile_start_date ) ) {
		$start_date = date_i18n( get_option( 'date_format' ), strtotime( $level->profile_start_date ) );
		$cost .= ' ' . sprintf( '%s %s', esc_html__( 'Billing starts on', 'paid-memberships-pro' ), esc_html( $start_date ) );
	}

	return $cost;
}

/**
 * Snap a timestamp to the "1st of the month" rule:
 * Days 1–14: 1st of that month.
 * Days 15+: 1st of the following month.
 *
 * @param int $timestamp Unix timestamp.
 * @return string MySQL-formatted date (Y-m-d H:i:s).
 */
function my_pmpro_snap_to_first_of_month( $timestamp ) {
	$day   = (int) date( 'j', $timestamp );
	$month = (int) date( 'n', $timestamp );
	$year  = (int) date( 'Y', $timestamp );
	$time  = date( 'H:i:s', $timestamp );

	if ( $day > 14 ) {
		if ( 12 === $month ) {
			$month = 1;
			$year++;
		} else {
			$month++;
		}
	}

	return sprintf( '%04d-%02d-01 %s', $year, $month, $time );
}