【javascript】日付を指定の形式で出力（追記2個） - Qiita

// d : [0.year, 1.month, 2.date, 3.hour, 4.minute, 5.sec, 6.msec, 7, 8.day] const dateFormats = { 'YYYY': d => d[0], 'YY': d => d[0].slice(-2), 'MM': d => d[1], 'M': d => +d[1], 'DD': d => d[2], 'D': d => +d[2], 'HH': d => d[3], 'H': d => +d[3], 'mm': d => d[4], 'm': d => +d[4], 'ss': d => d[5], 's': d => +d[5], 'fff': d => d[6], 'DDD': d => ['Sun', 'Mon', 'Tue', 'Wed', 'Thr', 'Fri', 'Sat'][d[8]],