When is primeiro used in Portuguese dates?

European Portuguese commonly uses the ordinal primeiro for the first of the month, as in o primeiro de junho. Brazilian usage also accepts the cardinal um, so both primeiro de junho and dia primeiro are correct depending on register.

Where does the conjunction e go in a Portuguese year?

Portuguese inserts e between the hundreds and the final group, and between tens and units. So 2026 is dois mil e vinte e seis, with e before vinte and again before seis, which is standard Portuguese number phrasing.

Why are there de connectors in the date?

Portuguese joins the parts of a date with de, giving the pattern day de month de year, for example quatro de junho de dois mil e vinte e seis. The de connectors are mandatory and distinguish Portuguese date phrasing.

Are Portuguese months capitalised?

No. Since the 1990 Orthographic Agreement, Portuguese month names like janeiro, junho, and dezembro are written in lower case unless they begin a sentence. The tool keeps months lower case as standard.

Portuguese Date in Words

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Writing a Portuguese date in full words uses de connectors between the day, month, and year, plus the conjunction e inside the year phrase. The first of the month is commonly the ordinal primeiro in European Portuguese.

How it works

The phrase follows the pattern day de month de year:

day:   1   → primeiro (European Portuguese ordinal)
       2–31 → cardinal: dois, três … trinta e um
month: 1–12 → janeiro, fevereiro … dezembro (lower case)
year:  cardinal with e connectors, e.g. 2026 → dois mil e vinte e seis

The conjunction e appears between hundreds and the remainder, and between tens and units, so 2025 is dois mil e vinte e cinco and 1999 is mil novecentos e noventa e nove.

Example and notes

01/06/2026 becomes o primeiro de junho de dois mil e vinte e seis, while 04/06/2026 becomes quatro de junho de dois mil e vinte e seis. Note the e before the final units group is always present in Portuguese, unlike English which omits the conjunction before tens.