'Third Day' in the Bible

Turn back, and say to Hezekiah the prince of my people, Thus says LORD, the God of David thy father, I have heard thy prayer, I have seen thy tears. Behold, I will heal thee. On the third day thou shall go up to the house of LORD.

And Hezekiah said to Isaiah, What shall be the sign that LORD will heal me, and that I shall go up to the house of LORD the third day?