houmonbi ha getuyou desu.

It is read:

ほうもんび は げつよう です。
Romanization: hōmonbi wa getsuyō desu

A few pronunciation notes:

• 訪問日 = ほうもんび
• The particle は is pronounced wa here, not ha
• 月曜 = げつよう
• です is often pronounced something like des in natural speech

Because when は is used as the topic particle, it is pronounced wa.

So in this sentence:

• 訪問日 = topic
• は = topic marker, pronounced wa
• 月曜です = what is being said about the topic

This is one of the first big spelling-vs-pronunciation points in Japanese:

• は as a normal syllable = ha
• は as a particle = wa

訪問日 is a compound noun made of:

• 訪問 = visit, call, visit to a place/person
• 日 = day, date

Together, 訪問日 means something like:

• the day of the visit
• the visit date
• the visitation date

In this sentence, it is the topic being discussed.

Japanese kanji often have multiple readings, especially in compounds.

For 日, common readings include:

• ひ
• び
• にち
• じつ

In 訪問日, the natural reading is び, so:

• 訪問日 = ほうもんび

This is something you usually learn word by word, because compound readings are not always predictable from simple rules.

Japanese sentence structure is different from English.

This sentence follows a very common pattern:

A は B です

which means:

As for A, it is B.

So here:

• 訪問日 = A
• は = topic marker
• 月曜 = B
• です = polite copula, roughly is

Japanese often puts the topic first, and the main statement comes after it.

は marks 訪問日 as the topic of the sentence.

That means the sentence is not just mechanically saying A equals B. It is more like:

• As for the visit date, it is Monday.

This is slightly different from an English subject marker.
A topic is what the sentence is about.

So the structure is:

• 訪問日 は = as for the visit date
• 月曜です = it is Monday

Both 月曜 and 月曜日 mean Monday.

• 月曜 is a common shortened form
• 月曜日 is the full form

Both are natural, and both are widely used.

So these are both fine:

• 訪問日は月曜です。
• 訪問日は月曜日です。

The shorter form often sounds a bit more compact and conversational, though it also appears in writing.

It is similar, but not exactly the same.

In beginner-level translations, です is often treated like is / am / are, and that is good enough for understanding many sentences.

Here:

• 月曜です = is Monday

But です is really a polite copula, and Japanese does not always match English grammar one-to-one.

The important beginner point is:

• です makes the sentence polite
• it is commonly used in A は B です sentences

Yes, in casual speech you often can.

Polite:

• 訪問日は月曜です。

Casual:

• 訪問日は月曜。

In casual conversation, Japanese often drops the copula after certain nouns and na-adjectives.
But if you are learning basic polite Japanese, keeping です is the safest choice.

Japanese does not use articles the way English does.

So 訪問日 does not need a word like the, and 月曜 does not need a.

Whether something means:

• the visit date
• a visit date
• the day of the visit

depends on context.

That is normal in Japanese. Context does a lot of work that English articles do.

Yes. In normal Japanese writing, it would usually be written without spaces:

訪問日は月曜です。

Spaces are often added only in beginner materials to make the sentence easier to read.

So:

• 訪問日　は　月曜　です。 = learner-friendly spacing
• 訪問日は月曜です。 = normal writing

It is a noun.

Days of the week in Japanese are nouns, so they can appear before です in this kind of sentence:

• 月曜です = it is Monday
• 火曜です = it is Tuesday
• 水曜です = it is Wednesday

So in this sentence, 月曜 is the noun that identifies the visit date.

Usually, this sentence is most natural with は.

• 訪問日は月曜です。 = As for the visit date, it is Monday.

If you used が, it would sound different because が marks the subject more directly and can add a sense of focus or identification depending on context.

A sentence with が is not impossible in all situations, but for a simple statement of topic like this, は is the standard choice.

So for a learner, the best version to remember is:

訪問日は月曜です。

Here are a few levels:

Polite neutral

• 訪問日は月曜です。

Casual

• 訪問日は月曜。
• 訪問日は月曜日だ。 ← more direct/plain style

More formal wording may depend more on vocabulary than just grammar, but the original sentence is already polite and perfectly normal for many situations.

So if you are studying basic polite Japanese, 訪問日は月曜です。 is a very good standard form.