syuusyuubi ha doyou desu.

It is read:

しゅうしゅうび は どよう です。
Romanized: shūshūbi wa doyō desu

A few parts:

• 収集日（しゅうしゅうび） = collection day
• は = topic marker, pronounced wa here
• 土曜（どよう） = Saturday
• です = polite ending, similar to is / it is

収集日（しゅうしゅうび） literally means collection day.

It is often used in practical contexts such as:

• garbage collection
• recycling collection
• pickup schedules

So depending on context, it could mean:

• The collection day
• The pickup day
• The day when something is collected

In everyday life, this word is very commonly seen on signs, notices, and municipal schedules.

This is one of the first unusual things learners notice.

The character は is normally read ha, but when it is used as the topic particle, it is pronounced wa.

So in this sentence:

• written: は
• pronounced: wa

This is just a standard grammar rule in Japanese:

• 今日は → きょうは but pronounced kyō wa
• 私は → わたしは but pronounced watashi wa

は marks the topic of the sentence.

So 収集日は土曜です is structurally like:

• As for the collection day, it is Saturday.

That sounds a little unnatural in English, but it shows what は does. It sets up 収集日 as the thing being talked about.

A natural English translation would usually just be:

• The collection day is Saturday.
• Collection day is Saturday.

Both are correct.

• 土曜（どよう） = Saturday
• 土曜日（どようび） = Saturday

土曜日 is the full form.
土曜 is a shorter form that is very common in schedules, calendars, notices, and concise writing.

So:

• 収集日は土曜です。
• 収集日は土曜日です。

Both mean essentially the same thing.

Yes, but it is small.

• 土曜日 sounds a little more complete or neutral
• 土曜 sounds a bit shorter, more schedule-like, and slightly more concise

You often see 土曜 in:

• timetables
• headings
• charts
• notices

You can think of it a bit like:

• Saturday vs.
• Sat.

That is not a perfect one-to-one comparison, but it gives the right feeling.

Because 収集日 is already a single noun meaning collection day.

You do not need の here.

Compare:

• 収集日 = collection day
• ごみの収集日 = garbage collection day

In ごみの収集日, の connects ごみ and 収集日:

• ごみ = garbage
• ごみの収集日 = garbage collection day

But in your sentence, 収集日 is already complete by itself.

です makes the sentence polite and complete.

In this sentence, it works like a polite is.

So:

• 収集日は土曜です。 = polite
• 収集日は土曜だ。 = plain / less polite
• 収集日は土曜。 = very casual or note-like

In normal polite conversation or formal writing, です is the standard choice.

Yes, it can be used by itself, but Japanese often relies on context.

For example, if you see this on a sign or notice, the full implied meaning might be:

• The garbage collection day is Saturday.
• The recycling pickup day is Saturday.

Japanese often leaves out information that is obvious from context.

So 収集日は土曜です。 may sound slightly incomplete in isolation to a learner, but in real life it is perfectly natural if the topic is already understood.

Japanese normally does not use spaces between words.

The standard writing would be:

収集日は土曜です。

Spaces are often added in learning materials to help beginners see the parts of the sentence more clearly.

So:

• learner-friendly version: 収集日 は 土曜 です。
• normal Japanese writing: 収集日は土曜です。

Usually day is better than date here.

• 日 can sometimes relate to a calendar date, but in this kind of phrase, 収集日 usually means the day of the week on which collection happens.
• Since 土曜 means Saturday, the sentence is clearly about a weekday, not a numbered date like the 14th or 21st.

So the most natural translations are:

• Collection day is Saturday.
• The collection day is Saturday.

You usually would not in this basic sentence unless you want a different emphasis.

• 収集日は土曜です。 = As for the collection day, it is Saturday.
• 収集日が土曜です。 = possible in some contexts, but it sounds more like you are specifically identifying the collection day as the thing that is Saturday

For most neutral statements like this, は is the natural choice.

A beginner rule of thumb:

• use は for the general topic
• use が when you need stronger focus, identification, or contrast depending on context

Yes, more or less.

Japanese often forms these simple A is B statements like this:

• A は B です

So here:

• 収集日 = A
• 土曜 = B
• です = polite copula

That gives:

• 収集日は土曜です。
• The collection day is Saturday.

So 土曜です is basically is Saturday, though in Japanese grammar it is better to think of です as the polite copula rather than exactly the English verb to be.

Both are natural, but 土曜日です may sound a little more complete in ordinary speech.

• 収集日は土曜です。 = concise, very natural, especially in notices or schedules
• 収集日は土曜日です。 = also natural, slightly fuller

In conversation, either one is fine. In written notices, the shorter 土曜 is especially common.