Why is the Polish day in the genitive?

A Polish date answers 'on which day', so the ordinal day takes the genitive. The fourth becomes czwartego, the first pierwszego, the twenty-first dwudziestego pierwszego. Both parts of a compound ordinal inflect.

Why is the month in the genitive case?

The month follows the day in a 'of June' relationship, so it is genitive. June, czerwiec, becomes czerwca; May, maj, becomes maja. Each month has its own genitive form that the tool supplies.

How is the year written in Polish?

The year is a compound ordinal in the genitive agreeing with roku. 2026 becomes dwa tysiące dwudziestego szóstego roku, where dwa tysiące stays cardinal and only dwudziestego szóstego carries the ordinal genitive ending.

Why do both the tens and units inflect in 26?

Polish inflects every element of a compound ordinal. Twenty-sixth in the genitive is dwudziestego szóstego, with both dwudziestego and szóstego taking the -ego ending, unlike some Slavic languages that inflect only the last word.

Does it use correct Polish diacritics?

Yes. The output includes ą, ę, ó, ś, ż and other Polish letters where required, so forms such as tysiące, szóstego, and września are spelled exactly as in standard Polish.

Polish Date in Words

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A Polish date written in words is needed on invoices, contracts, and formal correspondence. Polish grammar puts the day and year in the genitive ordinal and the month in the genitive, closing with the word roku. This tool assembles all parts with the correct case endings and diacritics.

How it works

The Polish date phrase has three inflected parts:

Day — an ordinal in the genitive. Both elements of a compound inflect: pierwszego, czwartego, dwudziestego pierwszego, up to trzydziestego pierwszego.
Month — the genitive form: stycznia, lutego, marca, kwietnia, maja, czerwca, lipca, sierpnia, września, października, listopada, grudnia.
Year + roku — a compound ordinal in the genitive. The thousands stay cardinal (dwa tysiące) and the remainder is a genitive ordinal (dwudziestego szóstego).

The number speller produces genitive ordinals by combining genitive ordinal stems for hundreds, tens, and units, and joins them with the cardinal thousands word.

Example

04.06.2026 produces:

czwartego czerwca dwa tysiące dwudziestego szóstego roku

That is czwartego (fourth, genitive), czerwca (of June), and dwa tysiące dwudziestego szóstego roku (of the two-thousand-twenty-sixth year).

Notes

For an exact thousand year such as 2000 the year becomes dwutysięcznego roku, a special single ordinal form.
Polish always closes the spelled-out year with roku, matching usage on official Polish documents.