get-annual-year.php

<?php

// 年度が始まる日
define('ANNUAL_START_DAY', '04-02');

/**
 * 「年度」を取得する
 *
 */
function get_annual_year(DateTime $date) {
    //$annual = DateInterval::createFromDateString(ANNUAL_START_DAY);
    $year = $date->format('Y');
    $annual = new DateTime($year . '-'.ANNUAL_START_DAY);
    $annual->sub(DateInterval::createFromDateString('1 second'));
    $hoge = $date->diff($annual);
    //var_dump($hoge);
    if ($hoge->invert) {
        //var_dump($year);
        return $year;
    } else {
        //var_dump($year-1);
        return $year-1;
    }
}


test();

function main() {

}

function test() {
    $theDay = new DateTime('2015-04-01');
    if (get_annual_year($theDay) == '2014') { echo 'OK!'.PHP_EOL; }
    else { echo 'NG!'.PHP_EOL; }
    $theDay = new DateTime('2015-04-02');
    if (get_annual_year($theDay) == '2015') { echo 'OK!'.PHP_EOL; }
    else { echo 'NG!'.PHP_EOL; }
    $theDay = new DateTime('2015-03-31');
    if (get_annual_year($theDay) == '2014') { echo 'OK!'.PHP_EOL; }
    else { echo 'NG!'.PHP_EOL; }
    $theDay = new DateTime('1970-03-31');
    if (get_annual_year($theDay) == '1969') { echo 'OK!'.PHP_EOL; }
    else { echo 'NG!'.PHP_EOL; }
    $theDay = new DateTime('1970-04-01');
    if (get_annual_year($theDay) == '1969') { echo 'OK!'.PHP_EOL; }
    else { echo 'NG!'.PHP_EOL; }
    $theDay = new DateTime('1970-04-02');
    if (get_annual_year($theDay) == '1970') { echo 'OK!'.PHP_EOL; }
    else { echo 'NG!'.PHP_EOL; }

    $theDay = new DateTime('1970-12-31');
    if (get_annual_year($theDay) == '1970') { echo 'OK!'.PHP_EOL; }
    else { echo 'NG!'.PHP_EOL; }


    $theDay = new DateTime('1970-1-1');
    if (get_annual_year($theDay) == '1969') { echo 'OK!'.PHP_EOL; }
    else { echo 'NG!'.PHP_EOL; }

    //$theDay = new DateTime('1970-03-33');
    //if (get_annual_year($theDay) == '1970') { echo 'OK!'.PHP_EOL; }
//else { echo 'NG!'.PHP_EOL; }
}