I tried to make a digital clock but got stuck on the last number 23.
$0 = (7 + 1 + 2) * 0$
$1 = (2 + 7 + 1) ^ 0$
$2 = (7 + 1) * 0 + 2$
$3 = 7 * 0 + 2 + 1$
$4 = 2 * 7 - 10$
$5 = 7 - 2 + 1 * 0$
$6 = 7 - 1 + 2 * 0$
$7 = 7 + 1 * 2 * 0$
$8 = 7 + 1 + 0 * 2$
$9 = 7 + 2 + 1 * 0$
$10 = 1 + 2 + 7 + 0$
$11 = 12 - 7^0$
$12 = 12 + 7 * 0$
$13 = 12 + 7 ^ 0$
$14 = 7 * 2 + 1 * 0$
$15 = 7 * 2 + 1 + 0$
$16 = (7 +1) * 2 + 0$
$17 = (7 + 1) * 2 + 0!$
$18 = (7 + 2) * (1 + 0!)$
$19 = 10 + 2 + 7$
$20 = 17 + 2 + 0!$
$21 = 7 * (2 + 1 + 0)$
$22 = 7 * (2 + 1) + 0!$
$23 = $