A kölcsönzési határidő holnap lesz.

It means borrowing deadline or, in many contexts, due date.

• kölcsönzés = borrowing, loaning
• -i = an adjective-forming ending, roughly related to
• határidő = deadline, due date

So kölcsönzési határidő literally means the deadline related to borrowing.

In a library context, a very natural English translation would often be The due date is tomorrow.

The -i ending often turns a noun into an adjective in Hungarian.

Here:

• kölcsönzés = borrowing
• kölcsönzési = borrowing-related

So kölcsönzési határidő works like:

• borrowing deadline
• or more literally, deadline of/for borrowing

This -i is very common in Hungarian:

• iskola → iskolai = school, school-related
• nyár → nyári = summer, summer-related

A is the Hungarian definite article, meaning the.

So:

• A kölcsönzési határidő = The borrowing deadline

Hungarian has two forms of the definite article:

• a before most consonants
• az before vowels

For example:

• a könyv = the book
• az iskola = the school

Since kölcsönzési begins with a consonant sound, it takes a.

lesz is the future form of to be.

• van = is / exists
• lesz = will be

So:

• A kölcsönzési határidő holnap van would sound odd here
• A kölcsönzési határidő holnap lesz = The due date will be tomorrow

In natural English, we often simply say The due date is tomorrow, but Hungarian commonly uses lesz when referring to something that will occur in the future.

Because holnap by itself already means tomorrow.

It functions as a time adverb, so it does not need a case ending here.

Examples:

• Ma van a vizsga. = The exam is today.
• Holnap lesz a vizsga. = The exam will be tomorrow.
• Tegnap volt a vizsga. = The exam was yesterday.

So in this sentence, holnap simply tells you when.

No, Hungarian word order is flexible, but changing it changes the emphasis.

This version:

• A kölcsönzési határidő holnap lesz. puts the topic first (the borrowing deadline) and then gives the new information (tomorrow).

You might also see:

• Holnap lesz a kölcsönzési határidő.

That version emphasizes tomorrow more strongly, something like:

• It will be tomorrow that the due date falls
• or simply The due date will be tomorrow

Both are grammatical, but they do not sound identical in emphasis.

Not always exactly, but it is often close.

határidő can mean:

• deadline
• due date
• time limit

In this sentence, the best English translation depends on context:

• in a library: due date
• in a formal administrative context: deadline

So even though the Hungarian word is the same, the most natural English choice may vary.

Sometimes Hungarian uses the present tense for future meaning, just like English can.

For example:

• Holnap van a határidő. = The deadline is tomorrow.

That is possible and natural in many contexts.

But lesz makes the future reference more explicit:

• A kölcsönzési határidő holnap lesz. = The borrowing deadline will be tomorrow.

So both present and future can be used for future time in Hungarian, depending on style and emphasis.

A rough pronunciation guide is:

A kölcsönzési határidő holnap lesz
aw KUHL-chuhn-zay-shee HAW-taar-ee-duh HOL-nawp less

A few helpful notes:

• ö and ő are rounded vowels not found in standard English
• cs sounds like ch in church
• sz sounds like s in see
• s by itself sounds like sh
• á is a longer a sound
• ő is a long version of ö

The stress in Hungarian is always on the first syllable of each word:

• KÖL-csön-zé-si
• HÁ-tár-i-dő
• HOL-nap
• LESZ