Mötet flyttades till den sjätte januari, så jag måste ändra min kalender.

Because mötet is the definite form of möte.

• ett möte = a meeting
• mötet = the meeting

So Swedish is marking the meeting directly on the noun with -t because möte is an ett-word.

The base form is möte, which means meeting.

Its forms are:

• ett möte = a meeting
• mötet = the meeting
• möten = meetings
• mötena = the meetings

This is a very common Swedish noun pattern for many ett-words.

The -s here marks the passive voice.

• Någon flyttade mötet = Someone moved the meeting
• Mötet flyttades = The meeting was moved

So flyttades means was moved.

This is a very common Swedish way to form the passive, especially in writing and formal speech.

You can think of it as:

• flytta = to move
• flyttade = moved
• flyttades = was moved

Yes. Flyttades is the past tense passive form.

Compare:

• Mötet flyttas = The meeting is being moved / gets moved
• Mötet flyttades = The meeting was moved
• Mötet har flyttats = The meeting has been moved

So in your sentence, the rescheduling already happened.

After a verb like flytta when something is rescheduled, Swedish commonly uses till for the new date:

• Mötet flyttades till fredag = The meeting was moved to Friday
• Mötet flyttades till januari = The meeting was moved to January
• Mötet flyttades till den sjätte januari = The meeting was moved to the sixth of January

So till here means to in the sense of rescheduled to.

That is a standard Swedish way to say a date:

• den + ordinal number + month

So:

• den första maj = the first of May
• den tredje juni = the third of June
• den sjätte januari = the sixth of January

In everyday Swedish, dates are often said this way.

Another common written form is:

• 6 januari

But in full written-out Swedish, den sjätte januari is very natural.

Because sjätte is the ordinal form of sex.

• sex = six
• sjätte = sixth

This is an irregular-looking form, so it usually just has to be learned.

A few examples:

• första = first
• andra = second
• tredje = third
• fjärde = fourth
• femte = fifth
• sjätte = sixth

In Swedish dates, den is commonly used before the ordinal number.

So:

• den sjätte januari
• den tionde april
• den tjugoförsta september

Also, when an adjective or ordinal is used in a definite expression like this, Swedish typically uses the weak form of the adjective/ordinal, which is why you see sjätte here.

For a learner, the easiest rule is simply:

Dates are often written as den + ordinal + month.

Because in Swedish, months are not capitalized unless they begin a sentence.

So:

• januari
• februari
• mars

This is different from English, where months are always capitalized.

Because så here works like so, linking two clauses:

• Mötet flyttades till den sjätte januari
• så jag måste ändra min kalender

After så used this way, Swedish usually keeps normal main clause word order:

• jag måste ändra
• not måste jag ändra

So this is very similar to English: ..., so I have to change my calendar.

Because måste is a modal verb, and modal verbs in Swedish are followed directly by the infinitive without att.

Examples:

• Jag måste gå = I must go / I have to go
• Hon kan simma = She can swim
• Vi vill äta = We want to eat

So:

• jag måste ändra = I have to change

No att is used after måste.

Because Swedish often uses the present tense to talk about something that is true now or will happen next.

Here, the meaning is:

• the meeting was moved
• therefore, now I need to change my calendar

So jag måste ändra min kalender literally uses present tense, but in English we also often do this with I have to change my calendar.

Swedish does not always need a special future form.

Here ändra means change or update, not replace with a new one.

So ändra min kalender means something like:

• change my calendar entry
• update my calendar
• adjust my schedule/calendar

If you wanted to say replace the calendar itself, Swedish would more likely use another verb depending on context, such as byta.

• ändra kalendern = change/update the calendar
• byta kalender = switch to a different calendar

Because kalender is an en-word:

• en kalender = a calendar

For en-words, the possessive is:

• min = my

Compare:

• en kalender → min kalender
• ett möte → mitt möte

So:

• min bok
• min kalender
• mitt hus
• mitt möte

No. Kalender can refer to:

• a paper calendar
• a planner
• a digital calendar
• a schedule/calendar app

In this sentence, it very naturally could mean a digital calendar, like the one on your phone or computer.

Not always strictly required, but it is natural here.

Swedish punctuation uses commas a bit more selectively than English, but a comma can be used to separate two related clauses for clarity:

• Mötet flyttades till den sjätte januari, så jag måste ändra min kalender.

You may also see similar sentences without a comma in less formal writing. The version with the comma is clear and perfectly normal.

Yes. A few common alternatives are:

• den sjätte januari = the sixth of January
• 6 januari = 6 January / January 6
• sometimes in speech simply sjätte januari

But den sjätte januari is a very standard full form, especially in careful writing or when spelling the date out in words.