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 submit the patent on Sunday.
He applied for the patent on Friday.
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
Short-term debt is recalculated on Thursdays.
Most futures traders don't have to work on Sundays.
The Weekend
British English: at the weekend OR at weekends (in general)
American English: on the weekend OR on weekends (in general)
Example:
All deposits made on the weekend will be registered in personal accounts on the next business day.
I can't access my bank account 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:
Jim calculates pre-tax profit at night, to make sure all the figures have come in.
Kevin calculates his pre-tax profit at night.
In / On time
'In time' expresses that something is done with sufficient time to meet a deadline.
Example:
The buyer said their minimum payment would arrive in time.
The deferred payments were able to be paid in time last month.
'On time' indicates an action that takes place at the correct, scheduled time.
Example:
My flight was delayed, I won't make it to the family reunion on time.
The customer needs to endorse their check and mail it in on time, otherwise they will have to pay a late fee.