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 going to recalculate the carrying cost tomorrow.
I'm inspecting the machinery and equipment on Tuesday.
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
Most companies don't have to do maintenance on Mondays.
Most retailers don't recalibrate the catch weight for orders on Saturdays.
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 inspect the property for maintenance and repair, and start handling tenant complaints on the weekend.
Let's measure the clear height of every tunnel in New Jersey 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:
Frank usually refuses to refer to our product as a commodity in the morning, but by mid-afternoon he's not so idealistic.
The workers stop thinking about manufacturing at night.
In / On time
'In time' expresses that something is done with sufficient time to meet a deadline.
Example:
They knew the manufacturing expenses in time.
We will switch to a computer-integrated manufacturing process in time to increase production in the next fiscal year.
'On time' indicates an action that takes place at the correct, scheduled time.
Example:
New consumer goods arrive exactly on time every morning.
They will assign the manufacturing overheads to the products on time for shipping.