مدة الإعارة وتاريخ الاستحقاق في الرسالة.

It can be understood either way, depending on context.

• In a user interface, heading, or notice, it is very natural as a label/phrase: Loan period and due date in the message.
• In context, it can also be read as an elliptical nominal sentence meaning something like The loan period and due date are in the message.

Arabic often omits the present-tense verb to be (is/are), so a verb does not need to appear.

Because Arabic commonly uses an iḍāfa construction, often called the construct phrase.

This pattern is:

• noun 1 + noun 2
• and it often means noun 1 of noun 2

So here:

• مدة الإعارة = the duration/period of the loan
• تاريخ الاستحقاق = the date of being due, which is naturally the due date

English uses of; Arabic usually just puts the two nouns together in this structure.

That is a key rule of iḍāfa.

In an iḍāfa:

• the first noun normally does not take الـ
• the second noun determines whether the whole phrase is definite or indefinite

So:

• مدة الإعارة is definite because الإعارة is definite
• even though مدة itself does not have الـ

This is why Arabic says مدة الإعارة, not المدة الإعارة.

The same applies to:

• تاريخ الاستحقاق

A common analysis is:

• مدة الإعارة وتاريخ الاستحقاق = the subject/topic
• في الرسالة = the predicate/complement, meaning in the message

If fully vocalized as a sentence, it would be roughly:

• مُدَّةُ الإعارةِ وتاريخُ الاستحقاقِ في الرسالةِ

That means:

• مدةُ: nominative
• الإعارةِ: genitive, because it is the second part of an iḍāfa
• تاريخُ: nominative, coordinated with مدة
• الاستحقاقِ: genitive, as the second part of another iḍāfa
• الرسالةِ: genitive, because it comes after في

In normal unvowelled writing, you usually do not see these endings.

Most naturally, it applies to the whole combined idea:

• The loan period and the due date are in the message

So في الرسالة is not just describing تاريخ الاستحقاق alone; it most naturally tells you where both pieces of information are found.

Arabic often places this kind of prepositional phrase at the end.

و means and. It joins two parallel noun phrases:

• مدة الإعارة
• تاريخ الاستحقاق

These are two coordinated items. In other words, Arabic is listing two pieces of information:

1. the loan period
2. the due date

Because they are parallel, they function together in the sentence.

Literally, استحقاق has meanings related to:

• being deserved
• being owed
• becoming due
• maturity/entitlement

In administrative, library, billing, or formal contexts, تاريخ الاستحقاق is a standard expression for due date.

So even though the noun is broader in meaning, the full phrase has a very natural fixed sense here.

This is because مدة ends in ة (tāʾ marbūṭa).

On its own, it is usually pronounced like:

• mudda or muddah

But in an iḍāfa construction, that ending is pronounced with a t sound:

• مدة الإعارة → muddat al-iʿāra

So this is a very common pattern:

• standalone: مدة
• in construct: مدة الإعارة → muddat al-iʿāra

It can mean several things depending on context, including:

• a letter
• a message
• an email
• a written communication more generally

In modern everyday contexts, especially in apps or online systems, الرسالة often means message or email, not necessarily a paper letter.

So the exact English translation depends on where the sentence appears.