Bez obzira na vreme, selidba počinje danas.

It is a very common fixed expression meaning regardless of, irrespective of, or sometimes despite in a broad sense.

It is best learned as a whole chunk:

• bez obzira na + accusative

Examples:

• bez obzira na vreme = regardless of the weather
• bez obzira na cenu = regardless of the price
• bez obzira na okolnosti = regardless of the circumstances

Literally, the words come from ideas like without consideration for, but in practice you should treat bez obzira na as one unit.

Because bez obzira na is a fixed phrase, and the noun after it goes with na.

So you do not usually build this freely word by word. You learn the pattern:

• bez obzira na vreme
• bez obzira na problem
• bez obzira na uslove

Even if English uses regardless of, Serbian uses bez obzira na.

It is in the accusative singular, because bez obzira na takes the accusative.

The noun vreme is a neuter noun. In the singular, many neuter nouns have the same form in the nominative and accusative, so:

• nominative: vreme
• accusative: vreme

That means the form does not change here, even though the case does.

It can mean both.

• vreme = time
• vreme = weather

The context tells you which one is meant. In this sentence, it means weather, because bez obzira na vreme naturally means regardless of the weather.

If the context were different, it could mean time, but here weather is the natural reading.

Selidba is a noun, not a verb.

It means the move, the moving process, or relocation.

So in this sentence:

• selidba = the move
• počinje = begins / starts

Together:

• Selidba počinje = The move begins / The moving starts

Also, selidba is a feminine noun, which is why the verb agrees with a third-person singular subject.

Because počinjati / početi can be used without se when something itself is beginning.

Here, the subject is selidba, so:

• Selidba počinje. = The move is beginning / The move begins.

You do not need se.

Compare:

• Film počinje. = The film starts.
• Sastanak počinje. = The meeting starts.

So this is a normal intransitive use of the verb.

Because in Serbian, just like in English, the present tense can be used for a scheduled, planned, or imminent future event.

So:

• Selidba počinje danas.

literally looks present, but it means something like:

• The move starts today.

This is very natural with things that are already arranged or expected.

Počinje is from počinjati, which is the imperfective verb.

Aspect pair:

• počinjati = imperfective
• početi = perfective

In this sentence, the imperfective present počinje is natural because Serbian often uses the imperfective present for scheduled or current events.

Related forms:

• Selidba počinje danas. = The move starts today.
• Selidba je počela. = The move started.
• Selidba će početi sutra. = The move will start tomorrow.

The phrase Bez obzira na vreme is an introductory concessive phrase, and the comma separates it from the main clause:

• Bez obzira na vreme, selidba počinje danas.

This is a very natural way to write it. The comma helps show the structure clearly:

• introductory phrase: Bez obzira na vreme
• main clause: selidba počinje danas

In practice, Serbian often uses a comma after this kind of fronted phrase, especially when it functions like regardless of X or despite X.

Yes, Serbian word order is fairly flexible, though some versions sound more neutral than others.

The given sentence is very natural:

• Bez obzira na vreme, selidba počinje danas.

You could also hear or say:

• Selidba počinje danas, bez obzira na vreme.
• Selidba danas počinje, bez obzira na vreme.

But the original version is good because it puts the regardless of the weather idea first, which gives it emphasis.

Yes. That is a longer, more explicit version.

Compare:

• Bez obzira na vreme, selidba počinje danas.
• Bez obzira na to kakvo je vreme, selidba počinje danas.

The second one is closer to:

• Regardless of what the weather is like, the move starts today.

The shorter version with just vreme is more compact and very natural.

A rough pronunciation is:

• počinje ≈ PO-chee-nye

A few details:

• č sounds like ch in chocolate
• nj is like the ny sound in canyon or Spanish ñ
• stress is typically on the first syllable here: PO-činje

So:

• počinje ≈ PO-chee-nye

That is a dialect/standard variation.

• vreme = Ekavian
• vrijeme = Ijekavian

Both are standard in different varieties of Serbian/Croatian/Bosnian/Montenegrin usage.

So this sentence in an Ijekavian form would be:

• Bez obzira na vrijeme, selidba počinje danas.

The grammar stays the same.