A digital clock beside a pool shows 20:53 in seven-segment digits. What does its reflection in the pool appear to read?

Water keeps the order of the characters and turns each upside down. 0 and 3 are unchanged, an upside-down 2 looks like a 5 and an upside-down 5 looks like a 2. So 2 0 : 5 3 reads 5 0 : 2 3. 35:02 and 23:50 reverse the order, which only an upright mirror would do.