Omission of the definite article it’s happen before nouns used in a general sense.
Life is short
Time waits for nobody.
Time is money.
If abstract nouns are used in a particular sense, the definite article is used.
The music of Pink Floyd is beautiful.
What is the time, please?
The pride of the young.
Also before material nouns used in a general sense. The definite article is used if they are used in a particular sense.
Give me a glass of water, please?
We buy sugar at the grocer’s.
I’ll take bread and milk.
Before the names of meals used in a general sense. If they are used in a particular sense the definite article is used.
What do you want for lunch?
We can talk over breakfast?
At what time do you have dinner?
Before the nouns home, church, table, bed, school, college, hospital indicating the use of the building or object. The definite article is used when we refer to the building or object as such.
They were at table when we come into the room.
My daughter is at school now.
David was in hospital for two weeks.
I left college year ago.
I will stay in bed today.
Before names of bridges, parks, railway stations, airports and squares.
The definite article is not used with nouns denoting the part of the day if they are preceded by the propositions at or by.
Also with the proposition in or during.
during the day
during the night
in the morning
in the evening
in the afternoon