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 next year based on signup day.
 * Days 1–14:  1st of the current month, next year.
 * Days 15+:   1st of the following month, next year.
 *
 * NOTE: This is for yearly membership levels.
 */
function my_pmpro_set_annual_profile_start_date( $checkout_level ) {
	if ( ! pmpro_isLevelRecurring( $checkout_level ) ) {
		return $checkout_level;
	}

	$now       = current_time( 'timestamp' );
	$day       = (int) date( 'j', $now );
	$month     = (int) date( 'n', $now );
	$next_year = (int) date( 'Y', $now ) + 1;
	$time      = date( 'H:i:s', $now );

	if ( $day <= 14 ) {
		$start_date = sprintf( '%04d-%02d-01 %s', $next_year, $month, $time );
	} else {
		if ( $month === 12 ) {
			$start_date = sprintf( '%04d-01-01 %s', $next_year + 1, $time );
		} else {
			$start_date = sprintf( '%04d-%02d-01 %s', $next_year, $month + 1, $time );
		}
	}

	$checkout_level->profile_start_date = $start_date;
	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;
}