Read the text and answer the following question carefully!

    That day was Saturday night. My friends and I went to Bromo Mountain for camping. We went there by bus. We arrived on the slope of Bromo Mountain on Sunday at 5 a.m. We climbed the Bromo Mountain on Sunday Morning. We built a tent for staying. We stayed in the area of Bromo Mountain for two days night. My friend, Damar had duty to look for some firewood for cooking. Dino had duty to look for some clean water. Roni and I had duty for cooking. Riko had duty to keep the tent clean and tidy. We had different duty.

    In the noon, my friends and I cooked together. We cooked some rice and also vegetables. After that we had lunch together. In the night, there were some interesting and fun games. We had to join the games. At 10 p.m. we made the fire and we sat making a circle around the fire. We also sang a song and one of us played a guitar. In the night, we went to sleep in the tent. I felt so cold. I could not steep anymore. I stayed up until the morning came. We decided to go home. I felt so tired. We went home by bus. Although we felt tired, we were happy because it was our first time to go to Bromo Mountain for camping.

When did they arrive on the slope of Bromo Mountain?