noun
dinnertime; suppertime
Refers to the time of the evening meal. Commonly used in everyday conversation.
夕食時に電話がかかってきた。
The phone rang at dinnertime.
夕食時には家族がそろう。
The family gathers at suppertime.
夕方 means 'evening' (a broader time period), while 夕食時 is specifically the time when dinner is eaten.
Compound of 夕食 (yūshoku, 'evening meal') and 時 (ji, 'time').