Why is the Czech day in the genitive?

A Czech date answers 'on which day', so the ordinal day takes the genitive ending -ého. The fourth is čtvrtého, the first prvního, the twenty-first dvacátého prvního, with both elements of a compound inflected.

Why is the month in the genitive case?

The month stands in a 'of June' relationship to the day, so it is genitive. June, červen, becomes června; May, květen, becomes května. Each month has its own genitive form that the tool supplies.

How is the year written in Czech?

The year is a compound ordinal in the genitive agreeing with roku. 2026 becomes dva tisíce dvacátého šestého roku, where dva tisíce stays cardinal and only dvacátého šestého carries the ordinal genitive ending.

Why do both tens and units inflect in 26?

Czech inflects every element of a compound ordinal. Twenty-sixth in the genitive is dvacátého šestého, with both dvacátého and šestého taking the -ého ending, the same pattern Czech uses throughout its ordinal system.

Does it use Czech diacritics correctly?

Yes. The output includes č, ř, š, ž, ě, ý and other Czech letters where needed, so forms like čtvrtého, šestého, září, and tisíce are spelled exactly as in standard Czech.

Czech Date in Words — Gera Tools

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A Czech date in words appears on contracts, invoices, and formal letters. Czech grammar puts the day and year in the genitive ordinal and the month in the genitive, closing with the word roku. This tool builds all parts with the correct case endings and diacritics.

How it works

The Czech date phrase has three inflected parts:

Day — an ordinal in the genitive, ending in -ého (or -ího): prvního, čtvrtého, dvacátého prvního, up to třicátého prvního.
Month — the genitive form: ledna, února, března, dubna, května, června, července, srpna, září, října, listopadu, prosince.
Year + roku — a compound ordinal in the genitive. The thousands stay cardinal (dva tisíce) and the remainder is a genitive ordinal (dvacátého šestého).

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

Example

04.06.2026 produces:

čtvrtého června dva tisíce dvacátého šestého roku

That is čtvrtého (fourth, genitive), června (of June), and dva tisíce dvacátého šestého roku (of the two-thousand-twenty-sixth year).

Notes

For an exact thousand year such as 2000 the year becomes dvoutisícího roku, a special single ordinal form.
Czech closes the spelled-out year with roku, matching the convention on Czech official documents.