Rok izvođenja je dogovoren.

A useful literal breakdown is:

• rok = deadline, time limit, term
• izvođenja = of carrying out / of execution / of performance
• je = is
• dogovoren = agreed

So the structure is roughly:

deadline of carrying-out is agreed

That is not natural English word order, but it helps show how Croatian is putting the idea together.

In this sentence, rok does not mean time in a general sense. It means something more specific:

• deadline
• time limit
• agreed term / period

So rok izvođenja is something like:

• the deadline for carrying out the work
• the completion deadline
• the agreed time frame for execution/performance

This word is very common in formal, business, legal, and technical Croatian:

• rok plaćanja = payment deadline
• rok isporuke = delivery deadline
• rok trajanja = expiration period / shelf life

Because it is in the genitive singular.

The basic noun is izvođenje. Its forms include:

• nominative: izvođenje
• genitive: izvođenja

After a noun like rok, Croatian often uses another noun in the genitive to express an of relationship.

So:

• rok izvođenja = deadline of execution / deadline for carrying out

This is very normal in Croatian. Compare:

• cijena proizvoda = price of the product
• plan rada = plan of work
• vrijeme dolaska = time of arrival

Izvođenje is a verbal noun, based on the verb izvoditi / izvesti.

Depending on context, it can mean:

• carrying out
• execution
• performance
• implementation

In technical or contract language, rok izvođenja often means the deadline for:

• carrying out works
• completing a project
• executing agreed tasks

In other contexts, izvođenje can also mean performance, especially in music or theatre:

• izvođenje skladbe = performance of a composition

So the exact English wording depends on the situation.

Dogovoren is a passive/adjectival participle formed from the verb dogovoriti.

It agrees with rok, which is:

• masculine
• singular

So the form is dogovoren.

You can compare the agreement:

• rok je dogovoren = the deadline is agreed
• cijena je dogovorena = the price is agreed
• vrijeme je dogovoreno = the time is agreed
• rokovi su dogovoreni = the deadlines are agreed

So the ending changes to match the noun it describes.

Because this sentence is not active. It is expressing a passive/resulting state.

• dogovorio means agreed in an active sense, used for a male subject who did the agreeing

  • Ivan je dogovorio rok izvođenja. = Ivan agreed the completion deadline.

• je dogovoren means has been agreed / is agreed, focusing on the deadline itself

  • Rok izvođenja je dogovoren.

So:

• dogovorio = someone agreed it
• dogovoren = it has been agreed

In practice, it is often closer to has been agreed.

Croatian biti + participle can describe either:

• a state: is agreed
• or the result of a completed action: has been agreed

In English, the most natural translation in many contexts would be:

• The deadline has been agreed.

In more formal or legal English, you might also see:

• The deadline is agreed.
• The deadline is agreed upon.

But for normal English, has been agreed is usually the safest choice.

Yes, it sounds fairly formal, administrative, or contract-like.

You would often see wording like this in:

• contracts
• project documentation
• business emails
• technical reports

A more everyday way to express a similar idea might be:

• Dogovorili smo rok. = We agreed the deadline.
• Rok smo dogovorili. = We agreed the deadline.
• Dogovoren je rok za izvođenje radova. = The deadline for carrying out the works has been agreed.

So the given sentence is correct and natural, but it belongs more to formal usage.

Yes. Croatian word order is fairly flexible.

These are all possible:

• Rok izvođenja je dogovoren.
• Dogovoren je rok izvođenja.
• Rok je dogovoren. (if izvođenja is already understood)

The basic meaning stays the same, but the emphasis changes a little.

• Rok izvođenja je dogovoren sounds neutral.
• Dogovoren je rok izvođenja puts a bit more focus on the fact that agreement has been reached.

In formal Croatian, the version starting with Dogovoren je... is also very common.

Because Croatian has no articles.

There is no direct equivalent of English the or a/an. Croatian usually leaves that idea to be understood from context.

So Rok izvođenja je dogovoren could mean:

• The deadline for execution has been agreed
• or, depending on context, A deadline for execution has been agreed

In real usage, it will usually be understood as the deadline, because the context normally makes it specific.

This is about aspect, which is very important in Croatian.

• dogovarati = imperfective, focusing on the process of agreeing
• dogovoriti = perfective, focusing on reaching an agreement successfully

Here the sentence describes a completed result, so the perfective verb is the natural choice:

• Rok se još dogovara. = The deadline is still being negotiated.
• Rok je dogovoren. = The deadline has been agreed.

So the sentence is not about the discussion process. It is about the fact that the agreement is already finished.