Potvrđujem dolazak na sastanak sutra u šest.

In Croatian, the subject pronoun is often omitted because the verb ending already shows who is doing the action.

• potvrđujem = I confirm
• the ending -em tells you it is 1st person singular

So Ja potvrđujem dolazak... is possible, but ja is usually unnecessary unless you want emphasis.

Potvrđujem is the 1st person singular present tense of potvrđivati / potvrditi in the sense I confirm.

In a sentence like this, Croatian often uses the present tense the same way English uses:

• I confirm...
• or more formally, I am confirming...
• or even I hereby confirm...

So this is a very natural form in emails, messages, and formal replies.

Dolazak is a noun meaning arrival or coming.

It comes from the verb doći = to come / to arrive.

In this sentence, dolazak na sastanak means something like:

• arrival at the meeting
• coming to the meeting
• in natural English, often simply attendance at the meeting

So Croatian uses a noun here where English might prefer a verb or a different noun.

Because potvrditi / potvrđivati often takes a noun phrase as its object.

So Croatian naturally says:

• Potvrđujem dolazak. = I confirm my arrival / attendance.

Rather than:

• Potvrđujem da ću doći. = I confirm that I will come.

Both are possible, but Potvrđujem dolazak is shorter, more formal, and very common in business or administrative language.

It is the direct object of potvrđujem, so it is in the accusative case.

However, dolazak is a masculine inanimate noun, and for many masculine inanimate nouns, the nominative and accusative singular look the same.

So:

• nominative: dolazak
• accusative: dolazak

Even though the form does not change, its role in the sentence is accusative.

Because na changes meaning depending on the case:

• na + accusative = motion toward something
• na + locative = location at/on something

Here, dolazak na sastanak means arrival to / coming to the meeting, so Croatian uses na + accusative:

• na sastanak

Compare:

• Idem na sastanak. = I am going to the meeting.
• Sam na sastanku. = I am at the meeting.

So na sastanku would mean at the meeting, not to the meeting.

Yes. Sutra u šest means tomorrow at six.

• sutra = tomorrow
• u šest = at six

Croatian commonly says just u šest without adding a word for o’clock.

So:

• u pet = at five
• u šest = at six
• u osam = at eight

This is completely normal and natural.

In practice, it usually refers to the time of the meeting you are confirming attendance for, but grammatically it can also feel connected to the arrival/coming.

So the sentence is understood as:

• I confirm that I will attend the meeting tomorrow at six.

Context usually makes this clear. If needed, Croatian can be made more explicit, for example:

• Potvrđujem dolazak na sastanak sutra u šest sati.
• Potvrđujem dolazak na sutrašnji sastanak u šest.

These make the time reference a bit clearer.

No, Croatian word order is fairly flexible.

The sentence:

• Potvrđujem dolazak na sastanak sutra u šest.

is natural, but other orders are also possible, depending on emphasis:

• Sutra u šest potvrđujem dolazak na sastanak.
  This sounds marked and emphasizes the time.

• Potvrđujem sutrašnji dolazak na sastanak u šest.
  Possible, but less natural in many contexts.

• Potvrđujem dolazak na sutrašnji sastanak u šest.
  Also natural.

The original version is a good neutral choice.

Yes, it sounds neutral to formal and is especially common in:

• emails
• work communication
• administrative contexts
• RSVP-style replies

It is a very natural way to confirm attendance.

In more casual speech, people might say something like:

• Dolazim sutra u šest na sastanak.
• Vidimo se sutra u šest na sastanku.

But Potvrđujem dolazak... is especially suitable when you want to sound polite and professional.

Not necessarily. Croatian often leaves possession implied when it is obvious from context.

So:

• Potvrđujem dolazak
  already naturally means I confirm my arrival / my attendance

You could make it explicit, but it is usually unnecessary:

• Potvrđujem svoj dolazak...

That is grammatically fine, but it may sound slightly more emphatic than needed. In most real situations, the original sentence is better.