The theme supported by the details in the text is:
People’s moods often change with the time of day.
In the excerpt, Gortsby reflects on how dusk appeals to him and aligns with his mood. He associates the falling darkness with an atmosphere of defeat and the presence of people who have experienced loss, suggesting that the time of day influences how individuals feel and how they choose to engage with the world around them. This connection between mood and the time of day is a central element of the passage.