1 has different meanings.
The main explanation of "arrival date" is "expiration", and the full name should be "arrival date". According to different usage scenarios, there are generally two understandings of catching due: the first one can be understood as rushing to submit an application, and the more common meaning is rushing to hand in homework or papers.
Ddl is a popular word in universities, called deadline, which means deadline, and mainly refers to various tasks to be completed in universities.
2. Different backgrounds
The meaning of catching the due date is more inclined to "the thing itself to be handed in", which can be said to be "I have several due dates to catch". DDL is the abbreviation of "deadline", which means "deadline for submission".
3. Different usages
DDL accounts for a higher proportion in spoken language. "due? "Date" is used more frequently in academics and magazines.