Я записую дату зустрічі в календар.

Because дату is the direct object of записую — it is the thing being written down.

• записую = I am writing down / I write down
• дата = date (dictionary form, nominative)
• дату = accusative singular

So in this sentence, Я записую дату... literally means I am writing down the date...

Because зустрічі is in the genitive singular. Ukrainian often uses the genitive after one noun to show a relationship like of in English.

So:

• дата зустрічі = the date of the meeting
• literally: date + meeting(of)

This is a very common pattern in Ukrainian:

• номер телефону = phone number
• центр міста = city center
• план уроку = lesson plan

So зустрічі here means of the meeting.

This is a very important point.

Here, в календар uses the accusative case because it suggests direction / putting something into something. The idea is:

• I enter/write it into the calendar

So the sentence feels like an action of adding an entry.

Compare:

• в календар = into the calendar → accusative
• в календарі = in the calendar → locative, more about location

For example:

• Я записую дату в календар. = I write the date into the calendar.
• Дата вже є в календарі. = The date is already in the calendar.

So both can make sense in different contexts, but в календар fits the idea of entering the date.

The preposition в / у often means in, into depending on the case used with it.

In this sentence:

• в + accusative = into
• в + locative = in

So:

• в календар = into the calendar
• в календарі = in the calendar

Also, в and у are often just pronunciation variants. Ukrainian chooses one or the other partly for ease of pronunciation.

For example:

• в календар
• у календар

Both are possible in many situations. Speakers often choose whichever sounds smoother in context.

Записую is the 1st person singular present tense form of записувати.

It means:

• I write down
• I am writing down
• I enter / note down

In this sentence, the most natural English meaning is something like:

• I’m writing down the date of the meeting in my calendar
• I’m entering the meeting date into my calendar

Ukrainian present tense often covers both English simple present and present continuous, so записую can mean either I write down or I am writing down, depending on context.

Записую comes from the imperfective verb записувати. Ukrainian aspect is very important.

Here is the basic contrast:

• записувати = imperfective
• записати = perfective

Very roughly:

• imperfective focuses on the process, repeated action, or ongoing action
• perfective focuses on completion

So:

• Я записую дату... = I am writing down / entering the date
• Я запишу дату... = I will write down the date / I’ll enter the date

In your sentence, the speaker is describing the action as ongoing or in progress, so the imperfective makes sense.

Yes, it can sound natural.

Ukrainian often leaves out words like my when they are obvious from context. So:

• в календар can mean in the calendar
• in real context, it may be understood as in my calendar

If the speaker wants to be more explicit, they could say:

• Я записую дату зустрічі в мій календар.

But often that sounds less natural unless the ownership matters. In many everyday situations, the shorter version is preferred.

No. Ukrainian has no articles like a, an, or the.

That means a noun like календар can mean:

• a calendar
• the calendar
• my calendar
• the calendar we are talking about

The exact meaning depends on context.

So in this sentence, English needs an article, but Ukrainian does not.

Yes. Ukrainian word order is more flexible than English word order.

The neutral order here is:

• Я записую дату зустрічі в календар.

But other orders are possible, depending on emphasis:

• Дату зустрічі я записую в календар.
  Emphasis on the date of the meeting
• В календар я записую дату зустрічі.
  Emphasis on where I’m writing it

Even though the order can change, the cases help show the grammatical roles:

• дату = object
• зустрічі = dependent genitive
• в календар = destination/place of entry

So Ukrainian does not rely on word order as heavily as English does.

Not usually in the physical sense of writing on the surface of a calendar.

This sentence more naturally means:

• I write down / enter the meeting date in/into the calendar

If you wanted to emphasize writing on something physically, Ukrainian might use a different wording depending on the context.

So the safest interpretation here is entering the date into a calendar/planner, not writing on top of the calendar page itself.

Here are the dictionary forms:

• Я → я = I
• записую → записувати = to write down, to record
• дату → дата = date
• зустрічі → зустріч = meeting
• в → в / у = in, into
• календар → календар = calendar

This is useful because Ukrainian words change form a lot, especially nouns and verbs.