Which Days
Days of The Week and Time Expressions
Days of the Week
Days of the week are capitalized.
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Example:
I'm shipping these batches on Tuesday.
I'm buying that ingredient on Monday.
When speaking about an action that is repeated every week on a specific day use the day of the week followed by 's'.
Mondays
Tuesdays
Wednesdays
Thursdays
Fridays
Saturdays
Sundays
You can't trust your first impressions about anything on Mondays.
Most hotels don't have to worry about inventory control on Wednesdays.
The Weekend
British English: at the weekend OR at weekends (in general)
American English: on the weekend OR on weekends (in general)
Example:
Let's tour the parks on the weekend.
They serve fresh bagels on the weekend.
Times of the Day
These time expressions express things that happen during the day. The exception to this form is 'at night'.
in the morning
in the afternoon
in the evening
at night
Example:
One weight reduction tip is to stop eating at night.
The motel usually asks customers to check out in the morning.
In / On time
'In time' expresses that something is done with sufficient time to meet a deadline.
Example:
If you stop to enjoy natural places of beauty on this walk you'll still arrive in time for the lecture.
If you hurry you'll get this into storage in time.
'On time' indicates an action that takes place at the correct, scheduled time.
Example:
The food and beverage director arrived at the training on time.
We turned over all receipts for our alcohol sales on time.