Override Months and Years for Sprout Invoices

functions.php

<?php // don't include this line in your functions.php, since it already starts with it.

function _custom_get_month_options() {
	$months = array(
	'01' => __( '01 - January', 'sprout-invoices' ),
	'02' => __( '02 - February', 'sprout-invoices' ),
	'03' => __( '03 - March', 'sprout-invoices' ),
	'04' => __( '04 - April', 'sprout-invoices' ),
	'05' => __( '05 - May', 'sprout-invoices' ),
	'06' => __( '06 - June', 'sprout-invoices' ),
	'07' => __( '07 - July', 'sprout-invoices' ),
	'08' => __( '08 - August', 'sprout-invoices' ),
	'09' => __( '09 - September', 'sprout-invoices' ),
	'10' => __( '10 - October', 'sprout-invoices' ),
	'11' => __( '11 - November', 'sprout-invoices' ),
	'12' => __( '12 - December', 'sprout-invoices' ),
	);
	return $months;
}
add_filter( 'si_payment_month_options', '_custom_get_month_options' );

function _custom_get_year_options( $number = 10 ) {
	$this_year = (int) date( 'Y' );
	$years = array();
	for ( $i = 0 ; $i < $number ; $i++ ) {
		$year = substr( $this_year + $i , 2 );
		$years[ $year ] = $this_year + $i;
	}
	return $years;
}
add_filter( 'si_payment_year_options', '_custom_get_year_options' );

This snippet is a customization for Sprout Invoices. A customizable solution that provides a way for you to get paid via your WordPress site. For more information please don't hesitate to reach out.