Hours node lets you specify hours during which it will be active.
The hours node uses double clock face to display full 24-hour clock. Inner ring represents hours during the day (from 6:00 to 18:00) while the outer represents the night hours (from 18:00 to 6:00).
The only arrow on the clock is the hours arrow (there are no minute or second arrows).
On the edges of the clock faces there are dark handles that allow you to adjust time span that the hours node is active.