Here are 7 important times or parts of the day in English.

MIDNIGHT
This is the middle of the night (00:00 hours).

MIDDAY
This is the middle of the day, also called "NOON" (12:00 hours).

MORNING
This is the time from midnight to midday.

AFTERNOON
This is the time from midday (noon) to evening.
From 12:00 hours to approximately 18:00 hours.

EVENING
This is the time from the end of the afternoon to midnight.
From approximately 18:00 hours to 00:00 hours.

DAWN
This is the time when the sun rises or comes up (sunrise).

DUSK
This is the time when the sun sets or goes down (sunset).