Sleep records, problem with dates

I have slept:

during the night from 7 to 8 February for 5:21, going to sleep at 1:50 on 8 February
during the night from 8 to 9 February for 7:06, going to sleep at 2:20 on 9 February

Why does the Cronometer record show the two entries on 8 February?

Answers