Questions about example sentences with, and the definition and usage of "Deadline"

A: It should mean Jan 20 midnight just before clock moves to the 21st.
But you might want to ask if you are going to be close to a deadline to be certain.

A: a deadline is a date that something must be done by.

to set a deadline is to create that date.
to meet the deadline is to finish the task before that date.

A: Deadline means : the latest time it should be completed

A: It is indeed a bit confusing. But see it like this.

When saying until Thursday it would mean starting or ending on Thursday. Wether it ends or start will depend on what you are asking for.

"When is the deadline?"
The deadline is until Thursday next week. Since a deadline is something that ends. Thursday would be the last day to make the deadline.

"When does this go on sale?"
This doesn't go on sale until Thursday next week. Since you're asking for when something starts. Thursday would be the first day of the sale

A: You have to get things done by a certain time. Be fast.

A: The deadline for our current project will be due next Friday.

A: - "The project's deadline is on Monday."
-"I have to make the deadline."

A: "I'm going to the gym", " I play the guitar ", " March 29 is the deadline for my project" ," my job is a web developer for a small company ". hope I helped any and did not confuse you. xD

A: I don't think there is a difference in meaning.
#1 sounds more natural.

A: They are pretty much interchangeable.

A: You wouldn't really say either of these things. You could maybe say "I'm busy because I'm trying to meet a/this deadline." But you'd never in any sentence say "I'm busy myself".

A: They're the same. I must say each of these a dozen times each week.

A: Due is a verb, deadline is a noun.
Example: "when is the deadline for this?", vs "when is this due (by)?" ('by' can be left out).
Or: "The deadline for this report is Thursday" vs "This report is due (by) Thursday" (Again, 'by' is optional).
When is 'the due' is incorrect.

A: I want to set the deadline to 10 days.

A: "If I meet the deadline for the school reports, I want to go to beach."

"If I get my reports for school done on time, I want to visit the beach."

A: It means by the end of Monday. Meaning, the last minute you can turn it is by 11:59pm Monday night. Midnight (12am) would technically count as Tuesday.

A: "The deadline is one week after the last day of finals."

A: Meet deadline

A: Both are natural. A sounds a bit more poetic, but B would be more commonly used in day to day language.

I think if you used A, it would sound a little more dramatic! And sometimes you want that.

A: I nearly missed the deadline for my homework that was due Monday.

A: It's almost the deadline to hand in the report.

A: A better way to say it would be something like: "I'm not sure, but, compared to us, it is not as important to them to meet a deadline." - Here, I just rearranged your original sentence.
"I'm not sure about them, but I don't think meeting a deadline is as important to them as it is to us." - Here, I changed things around to make it sound a bit more uncertain (if that's what you were going for.)

Hope this helps!

A: いい質問です！grammatically, the stated date should indeed be excluded. So "i will send this to you by Monday" means "I will send this to you before Monday arrives". But in colloquial English, the meaning of "by" is often changed to INCLUDE the stated date even though grammatically speaking, it should not be.