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/**
 * 取得 現在年月日時分
 * @return{string} 現在時刻をベースにした YYYYMMDDHHmm
 */
function get_datetime_string() {
	const datetime = new Date();
	const year     = datetime.getFullYear();
	const month    = datetime.getMonth() + 1;
	const day      = datetime.getDate();
	const hours    = datetime.getHours();
	const minutes  = datetime.getMinutes();
	return String(
		year    * 100000000
		+ month * 1000000
		+ day   * 10000
		+ hours * 100
		+ minutes
	);
}