firefly-iii/resources/lang/en_US/config.php

<?php
declare(strict_types=1);

/**
 * config.php
 * Copyright (c) 2017 thegrumpydictator@gmail.com
 *
 * This file is part of Firefly III.
 *
 * Firefly III is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Firefly III is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
 */

return [
    'html_language'    => 'en',
    'locale'           => 'en, English, en_US, en_US.utf8, en_US.UTF-8',
    'month'            => '%B %Y',
    'month_and_day'    => '%B %e, %Y',
    'date_time'        => '%B %e, %Y, @ %T',
    'specific_day'     => '%e %B %Y',
    'week_in_year'     => 'Week %W, %Y',
    'year'             => '%Y',
    'half_year'        => '%B %Y',
    'month_js'         => 'MMMM YYYY',
    'month_and_day_js' => 'MMMM Do, YYYY',
    'date_time_js'     => 'MMMM Do, YYYY, @ HH:mm:ss',
    'specific_day_js'  => 'D MMMM YYYY',
    'week_in_year_js'  => '[Week] w, YYYY',
    'year_js'          => 'YYYY',
    'half_year_js'     => 'Q YYYY',
];