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German Phrase

An welchem Tag ist die Party?

/an ˈvɛlçəm taːk ɪst diː ˈpaʁti/
Meaning"On which day is the party?"
💡

Meaning

This question asks for the specific calendar day on which a party will take place. It is a polite, neutral way to inquire about the date of an event.

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When to use

Use this sentence when you’re coordinating plans with friends, confirming invitations, or need to mark the date on your calendar. It works in both casual and semi‑formal contexts.

✦Grammar Breakdown

AnwelchemTagistdieParty?

1

An (preposition)

The preposition 'an' is used with the dative case to indicate a point in time (e.g., 'an einem Tag').

2

welchem (interrogative adjective)

Because 'an' governs the dative, the interrogative adjective takes the dative masculine form 'welchem'.

3

Tag (masculine noun)

‘Tag’ is a masculine noun; in the dative singular it becomes 'Tag' (no ending change) but the article would be 'dem'.

4

ist (verb ‘sein’)

The verb ‘sein’ is used here as a copula linking the subject ‘die Party’ with the temporal complement.

5

die Party (subject)

‘Party’ is a feminine noun borrowed from English; it stays in the nominative case as the subject of the sentence.

🗨In Conversation

A

An welchem Tag ist die Party?

On which day is the party?

Sie ist am Samstag, den 12. Mai.

It’s on Saturday, May 12th.

B

✕Common Mistakes

  • An welcher Tag ist die Party?

    ‘Welcher’ is nominative; after ‘an’ you need the dative form ‘welchem’.

  • Auf welchem Tag ist die Party?

    ‘Auf’ is used for location (on a surface), not for points in time.

  • Die Party ist an welchem Tag?

    Word order is incorrect for a standard question; the interrogative phrase should come first.

↔Alternatives

  • Wann findet die Party statt?

    When does the party take place?

  • An welchem Datum ist die Party?

    On which date is the party?

  • Welcher Tag ist die Party?

    Which day is the party?

de

Cultural Tip

In German‑speaking countries, it’s common to specify both the day of the week and the calendar date when talking about events. If you’re unsure about formality, ‘An welchem Tag…’ is safe for friends, colleagues, and even acquaintances. Remember that ‘Party’ is a loanword and is treated as feminine (die Party).