How to write dates in Portuguese correctly for everyday writing

Introduction

Writing dates correctly in Brazilian Portuguese is a small but essential skill for everyday communication. This guide explains the common formats, vocabulary, punctuation, formality, and typical mistakes so you can write dates in messages, emails, forms, and notes with confidence.

Basic date order and common formats

The standard date order in Brazilian Portuguese is day-month-year. This appears in both informal and formal writing. For everyday texts and messages, two formats are most common: a full written form with month names and a numeric form using slashes or hyphens.

Full written form (natural): 5 de maio de 2026

Numeric (common): 05/05/2026 or 05-05-2026

When filling forms, check whether they expect day/month/year. In Portuguese-language forms in Brazil, day-month-year is the default.

Writing months: spelling and capitalization

Month names in Brazilian Portuguese are spelled in lowercase unless they start a sentence. Learn the twelve month words and their spelling to avoid mistakes:

janeiro, fevereiro, março, abril, maio, junho

julho, agosto, setembro, outubro, novembro, dezembro

Note that março has a cedilla-like character only in older fonts; the correct spelling is março with a c-cedilla? No — the correct is março with a c-cedilha is not used; use março? Clarification: the correct spelling is março with a ç. Use março in your writing.

How to write the full date in sentences

When writing dates in running text, use the pattern day de month de year. Include the preposition de before the month and year. This is the most natural structure for emails, messages, and notes.

Pattern: dia de mês de ano

Example: A reunião é no dia 12 de junho de 2026.

In casual messages, you can omit dia or combine contractions with no (em + o). Example: Vamos nos ver em 12 de junho de 2026 or Vamos nos ver no dia 12 de junho de 2026.

Ordinal numbers and spoken vs written style

Portuguese speakers sometimes use ordinal numbers when speaking: primeiro, segundo, terceiro. In writing, ordinals are less common for everyday dates. When used, they often appear with the definite article and gender agreement.

Example (spoken-like writing): Hoje é o primeiro de maio de 2026.

For forms, planning, and schedules, prefer the cardinal day: 1 de maio de 2026 or 01/05/2026.

Short forms and numeric formats

Numeric dates are practical for forms and informal notes. The common separators are slashes and hyphens. Brazilians typically use DD/MM/YYYY, often without leading zeros in casual writing but including them in forms.

Examples: 1/5/2026, 01/05/2026, 01-05-2026

For clarity in international contexts, avoid YYYY/MM/DD unless a form asks for it. If you need to write a compact date in messages, DD/MM is often enough: 12/06 (meaning 12 de junho).

Time and date together

When combining time and date, place the time before or after the date depending on emphasis. Use h or : for time. In informal writing, 14:30 is common; in messages you might see 14h30.

Example: A reunião será no dia 12 de junho de 2026 às 14:30.

Note the preposition às (a + as) before the time to indicate at (plural feminine for horas). For 1:00 use à 1:00 because a hora is singular: Exemplo: O evento começa às 9:00. O almoço é à 12:00.

Prepositions and contractions

Common prepositions with dates are em, no, na, de. Use em for general references and no/na when the noun is specified (em + o = no, em + a = na).

Example: Vou viajar em julho. Vou viajar no dia 10 de julho de 2026.

When you want to say on a particular day of the week, use na/ no + dia/nome do dia: Exemplo: A aula é na segunda-feira, 14 de junho de 2026.

Weekdays and month abbreviations

Weekday names are segunda-feira, terça-feira, quarta-feira, quinta-feira, sexta-feira, sábado, domingo. Abbreviations and short forms appear in schedules and messages.

Example: seg., ter., qua., qui., sex., sáb., dom.

Month abbreviations are commonly três-letter forms in calendars: jan, fev, mar, abr, mai, jun, jul, ago, set, out, nov, dez. Use lowercase for these abbreviations in casual contexts.

Writing dates in emails and formal documents

In formal email closings or official documents, write the full date clearly. Use the pattern city, day de month de year if needed in headings, but for simple messages the standard day de month de year works.

Example: São Paulo, 12 de junho de 2026.
Com relação ao contrato, a assinatura será em 12 de junho de 2026.

In formal contexts avoid numeric ambiguity. Prefer 12 de junho de 2026 over 12/06/2026 when clarity matters.

Practical message and email examples a beginner might write

Short message confirming a meeting: Reunião dia 12 de junho de 2026 às 15:00. Confirma?

Rescheduling via chat: Posso adiar para 14/06/2026? Estou livre depois das 10h.

Email to a teacher: Olá professora, minha prova será no dia 05 de maio de 2026? Obrigado.

Booking a table: Gostaria de uma mesa para 2 no dia 20/06 às 20:30.

Filling a form: Data de nascimento: 01/01/1995

Common beginner mistakes and how to avoid them

Using month/day/year order like English speakers. Remember Brazilian Portuguese uses day/month/year, so write 07/08/2026 for 7 August 2026, not July.

Omitting de between day and month in full written form. Incorrect: 12 junho 2026. Correct: 12 de junho de 2026.

Capitalizing month names. Incorrect: 12 de Junho de 2026. Correct: 12 de junho de 2026.

Mixing English month names with Portuguese prepositions. Incorrect: 12 de May de 2026. Always use Brazilian Portuguese month names.

Forgetting the accent marks in words like sábado and ação when they appear near dates. Example: Sábado, 10 de julho de 2026 (remember the acute accent on sábado).

Quick patterns and templates to memorize

Pattern for messages: [evento] dia [D] de [mês] de [YYYY]. Example: Encontro dia 8 de agosto de 2026.

Pattern for invitations: [Dia da semana], [D] de [mês] de [YYYY] às [hora]. Example: Sábado, 10 de julho de 2026 às 19:00.

Pattern for forms: DD/MM/YYYY. Example: 08/08/2026.

Pattern for casual chat: D/M ou DD/MM. Example: 8/8 or 08/08.

Practice exercises for learners

Convert English date 14 July 2026 into Portuguese written form: 14 de julho de 2026.

Write a short WhatsApp message to confirm a meeting on 3 September 2026 at 10:00: Reunião dia 03 de setembro de 2026 às 10:00. Confirma?

Fill a form with birthday 2 March 1998 using numbers: 02/03/1998.

Write a polite email line setting a deadline of 25 December 2026: O prazo é 25 de dezembro de 2026.

Tone and formality tips

For friends and chat: short numeric forms and omitting formal prepositions are acceptable. Example: Vamo nos ver 12/06?

For work, school, and official messages: always use full written forms with prepositions and correct accents. Example: A entrega será no dia 12 de junho de 2026.

In invitations, use a slightly formal tone: Exemplo: Convidamos você para a festa no dia 20 de agosto de 2026, às 18h.

Useful vocabulary related to dates

hoje — today

amanhã — tomorrow

ontem — yesterday

dia — day

mês — month

ano — year

data de nascimento — date of birth

Examples of short writing tasks a beginner might do

Writing your birthdate on a form: 15/11/1990

Sending a simple plan in chat: Vamos almoçar 10/06 às 12h?

Replying to an invitation: Posso ir no dia 20 de julho de 2026. Obrigado!

Noting a deadline in a planner: Entrega do trabalho — 30/09/2026

Final practical tips

Always check the requested format when filling official forms.

Use the full written form when clarity or formality is needed.

Memorize month names and weekday spelling to avoid capitalization and accent errors.

When in doubt, write out the month name rather than rely on numbers to reduce ambiguity.

Conclusion

Mastering how to write dates in Brazilian Portuguese takes a little attention to order, prepositions, and month spelling. Use day de month de year for clear sentences, DD/MM/YYYY for forms, and be mindful of formality and accents. With the patterns and examples here you can confidently write dates in messages, emails, forms, and everyday notes.