Saying and Writing Dates

Dates are where Polish ordinals earn their keep, and they catch English speakers off guard for one specific reason: the same date appears in two different cases depending on the job it is doing in the sentence. "Today is the fifteenth" uses one form; "on the fifteenth of May" uses another — and neither of them looks like the English. This page drills the two patterns side by side, shows the month always in the genitive, handles the year, and gives you the standard written form so you can fill in a form or sign a letter correctly. For the ordinal forms themselves (pierwszy, drugi, trzeci…), see Ordinal Numbers.

"Today is the…": the nominative ordinal

To ask and answer what today's date is, Polish uses the ordinal in its plain dictionary form — the nominative, masculine (because the unspoken noun is dzień, "day", which is masculine):

The question Który dzisiaj jest? literally asks "Which [day] is today?" and the answer is the bare ordinal: piętnasty (15th), pierwszy (1st), trzydziesty (30th). Because it is the subject complement of jest, it sits in the nominative — exactly the form you would find in a list of ordinals.

Note the diacritic in piętnasty — the ę is obligatory; pietnasty is simply misspelled. The same nasal vowel runs through piąty (5th), dziewiąty (9th), dziesiąty (10th), and piętnasty (15th).

"On the…": the bare genitive, with no preposition

Now the surprise. To say something happens on a date — "I'm arriving on the fifteenth", "the meeting is on Monday the third" — Polish does not use a preposition like English "on". Instead, the ordinal goes into the genitive, and that genitive ending alone carries the meaning "on that day":

Compare the two forms of the same number directly:

The genitive ending -ego is the engine here. There is no Polish word for "on" in a date — the case does the work. This is the hardest single point on the page for English speakers, because English forces you to choose a preposition ("on the 15th") and Polish forbids it.

The month is always genitive: maja, stycznia, grudnia

Whichever case the day takes, the month name in a date is always in the genitive — think of it as "of May", "of January". So "on the fifteenth of May" stacks a genitive day onto a genitive month:

Here are the twelve months in their dictionary (nominative) form and the genitive form you actually use in dates:

Notice how several months drop a vowel when they take the genitive ending: styczeń → stycznia, kwiecień → kwietnia, wrzesień → września, grudzień → grudnia. That dropped -e- is a "fleeting vowel", a regular feature of Polish noun stems. And note that month names are not capitalized mid-sentence in Polish: it is maja, stycznia, never Maja, Stycznia.

"In which year?": the year and the rule that only the last word is ordinal

For the year, Polish has its own quirk that trips up even confident learners. In a full year like 2026, only the final element is an ordinal — the rest stay cardinal. So 2026 is read dwa tysiące dwudziesty szósty ("two thousand twenty-sixth"), where dwa tysiące is the cardinal "two thousand" and only dwudziesty szósty ("twenty-sixth") is ordinal.

To ask and answer the year:

Two things are happening at once here. First, "in the year" is w roku, and the year-ordinal goes into the locative to match (that -ym ending: dziesiątym, dziewięćdziesiątym). Second — the rule the brief flags — only the last component is the ordinal: 1990 is tysiąc dziewięćset dziewięćdziesiąty (cardinal "one thousand nine hundred" + ordinal "ninetieth"), not a string of ordinals.

The full spoken date vs the written form

Put the day, month and year together in speech and you get a genitive day + genitive month + genitive year:

In writing, Polish uses a compact convention. The standard form is the day as a plain numeral, the month spelled out (or as a Roman numeral), the year, and the abbreviation r. for roku ("of the year"):

• 15 maja 2026 r. — day in figures, month in words, r. for "year"
• 15 V 2026 r. — month as a Roman numeral (common on official stamps and forms)
• 15.05.2026 — all figures, used on forms and in casual writing

Crucially, even though you write "15 maja 2026 r.", you still read it aloud in the full genitive: piętnastego maja dwa tysiące dwudziestego szóstego roku. The written 15 is pronounced piętnastego, not piętnaście. For the full conventions on abbreviations and numerals in writing, see Numerals, Dates and Abbreviations.

Common Mistakes

(The single biggest error: importing English "on" as na or w. The genitive ending -ego already means "on that day"; adding a preposition is wrong.)

(When the date is what "today" equals, it is nominative: piętnasty. The genitive piętnastego is only for "on the 15th".)

(The dictionary form maj never appears in a date; it is always maja ("of May"). Every month behaves this way.)

(In a compound year-ending like "twenty-sixth", both the tens and units of that final block are ordinal: dwudziestym szóstym, not the cardinal dwadzieścia. The cardinal part is only the dwa tysiące lead-in.)

(Unlike English, Polish writes months in lower case: stycznia, maja, grudnia.)

Key Takeaways

• "Today is the 15th" → nominative: Dzisiaj jest piętnasty. The date is a subject complement.
• "On the 15th" → genitive, no preposition: piętnastego. The case ending alone means "on".
• The month is always genitive in a date: maja, stycznia, grudnia — and lower-case.
• In a year, only the final word is ordinal: 2026 = dwa tysiące dwudziesty szósty; "in 2026" puts that ordinal in the locative (dwudziestym szóstym).
• Written form: 15 maja 2026 r., but read aloud in the full genitive.