"I eat dinner at 7 in the evening."
我晚上七点吃饭。I have dinner at seven o'clock in the evening. Literal: I evening/night 7:00 to have a meal/to eat.
晚餐 wǎn cān evening meal dinner
晚饭 wǎn fàn evening meal dinner supper
饮宴 yǐn yàn banquet dinner drinking party feast
See Yabla link for light dinner...