Introduction
Learning how to write dates, times, and days correctly in Brazilian Portuguese can prevent misunderstandings in messages, emails, travel plans, and schedules. This guide explains common mistakes English-speaking learners make and gives clear, practical examples you can copy into real-life writing situations.
- Why dates, times, and days cause problems
- Times: 24-hour vs 12-hour and punctuation
- Common prepositions and contractions
- Days of the week: spelling, capitalization, and articles
- Punctuation and accent marks that change meaning
- Common mistakes with abbreviations and numbers
- Practical sentence patterns and templates
- Beginner tips to avoid mistakes
- Common error checklist
- Real-world small writing exercises
- Quick reference: useful words and prepositions
- Conclusion
Why dates, times, and days cause problems
English and Portuguese use different word order, punctuation, and prepositions for dates and times. Learners often translate directly from English, creating forms that look unnatural or are ambiguous for native speakers. This section highlights the typical differences to watch for.
Date format: day first, not month first
Portuguese uses day-month-year order. Writing month-day-year is a frequent error when translating from English.
Wrong: 07/04/2026 (could be read as July 4 in English contexts)
Correct: 04/07/2026 or 4/7/2026 (in Brazil this reads as quatro de julho de 2026)
Beginner example to copy into a message: Eu chego em 04/07/2026.
Writing full dates in words
When spelling dates, include the preposition de between day, month, and year. Omitting de is a common mistake.
Wrong: 4 julho 2026
Correct: 4 de julho de 2026
Practical sentence: A reunião é dia 4 de julho de 2026 às 10h.
Months and capitalization
Months are not capitalized in Portuguese. Learners sometimes use English-style capitalization.
Wrong: Novembro
Correct: novembro
Example in an email: Vou viajar em novembro.
Times: 24-hour vs 12-hour and punctuation
Brazilian Portuguese commonly uses both 24-hour and 12-hour formats. Know when to use each and how to write them correctly.
24-hour format and the letter h
In writing, people often use the letter h instead of a colon to separate hours and minutes. Using a colon is not wrong but less common in informal Portuguese contexts. Avoid mixing styles.
Common: 14h30 or 14:30
Less common but acceptable: 14.30 (avoid unless copying a local template)
Example for a schedule: O trem parte às 14h30.
12-hour format and specifying manhã/tarde/noite
If you use 12-hour time, indicate manhã, tarde, or noite to avoid ambiguity. Using AM/PM is not typical in written Portuguese.
Wrong: 8 PM
Correct: 20h or 8h da noite
Message example: Podemos nos ver às 8h da noite?
Using horas vs h
Informal notes often use h, while formal writing may spell out horas. Beginners sometimes mix these, making the tone inconsistent.
Informal: Chego às 9h.
Formal: A conferência começa às 9 horas.
Common prepositions and contractions
Choosing the right preposition with dates and days is crucial. Prepositions and contractions are often a major source of mistakes.
Preposition em and contraction no/na
Use em + day/month unless you specify a definite article where na/no are required. Many learners forget to contract em + o/a into no/na.
Correct: em janeiro, no dia 5, na sexta-feira
Examples: Vou viajar em janeiro.
O evento é no dia 5.
Temos aula na sexta-feira.
Use de for full dates and for possession
Always use de between parts of a full date. Incorrect omission leads to unnatural phrases.
Correct: 15 de agosto de 2026
Beginner sentence: Meu aniversário é em 15 de agosto de 2026.
Days of the week: spelling, capitalization, and articles
Days of the week are lowercase and often preceded by na/na terça, no sábado. Students sometimes capitalize or forget to use articles.
Lowercase days and month names
Correct: segunda-feira, terça-feira, quarta, quinta-feira, sexta-feira, sábado, domingo
Example in a text: A reunião é na terça-feira.
Omit feira for casual use but be careful
Abbreviating feira is common in speech but avoid abbreviations in writing unless you are certain: terça is sometimes used informally, but terça-feira is safest for learners.
Safe: terça-feira
Casual chat: Vamos na terça?
Punctuation and accent marks that change meaning
Accent marks (acentos) are essential. Missing or misplaced accents can change words and confuse readers. Pay attention to accents in days, months, and time-related words.
Common accent mistakes
Examples of words with accents: às (contraction of a + as), há (there is/ago), hoje (no accent), mês (month) — incorrect accents can alter meaning.
Wrong: as 9h (means plural article as, not contraction às)
Correct: às 9h
Practical sentence: A aula começa às 9h.
Using há vs tem for past time expressions
Use há to mean ago. Tem is informal and colloquial but becomes unclear in writing. Beginners often translate there is/there are directly and misuse tem.
Correct: Ele chegou há dois dias.
Less formal but common spoken: Ele chegou tem dois dias (avoid in writing).
Common mistakes with abbreviations and numbers
Abbreviations like dia, seg., ter., and numerical shortcuts can be ambiguous. Use standard forms for clarity in emails, schedules, and forms.
Writing days in short form
Avoid unclear abbreviations. For formal writing or messages that need clarity, write the full day or use well-known abbreviated forms like seg., ter., qua., qui., sex., sáb., dom.
Clear: Reunião na segunda-feira às 10h.
Avoid: Reunião seg. 10h (unless the recipient expects that shorthand).
Ordinal numbers with dates
Portuguese often omits the ordinal indicator for dates in everyday writing. Avoid adding unnecessary rd/th as in English. When you want to use ordinals, know the correct forms.
Common: 1 de maio, 2 de junho
Ordinal form (more formal): primeiro de maio, segundo de junho
Example in a form field: Data do evento: 1 de maio de 2026.
Practical sentence patterns and templates
Here are ready-to-use patterns for messages, emails, and notes. Copy and adapt them to avoid common errors.
Scheduling a meeting: Podemos marcar a reunião para dia 12 de abril de 2026 às 15h?
Confirming a time: Confirmo que chego às 9h do dia 04/07/2026.
Changing a date: Desculpe, preciso adiar para 10 de maio de 2026.
Asking about schedules: Você está disponível na sexta-feira à tarde?
Travel plan note: Voo SA123, partida 21h45, chegada em 06/04/2026 às 07h30.
Short chat messages
Chatting casually allows contractions and simpler formats, but keep key rules: day-month, use de, and specify manhã/tarde/noite if needed.
Example: Vamos almoçar sábado às 12h?
Example: Chego dia 03/06 às 22h30, te ligo quando pousar.
Beginner tips to avoid mistakes
Follow these simple rules to reduce errors and sound natural.
Always write day-month-year: 05/11/2026 means cinco de novembro de 2026 in Brazil.
Use de between day, month, and year: 5 de novembro de 2026.
Lowercase months and days: novembro, segunda-feira.
Use às for time contractions: às 14h, às 8h da manhã.
Prefer 24-hour format for schedules: 18h30 instead of 6:30 PM.
Common error checklist
Quick checklist to proofread your writing before sending messages, emails, or filling forms.
Did you use day-month-year? If not, correct it.
Did you include de between date parts? Add de if missing.
Are months and weekdays lowercase? Change capitalization if needed.
Did you write às for specific times? Replace as with às for clarity.
Did you add manhã/tarde/noite when using 12-hour format? If not, use 24-hour time or add the period of day.
Real-world small writing exercises
Practice these small exercises and compare with the correct answers below.
Exercise 1 (fill a calendar invite): Meeting on July 4, 2026 at 10 AM — write it in Portuguese.
Exercise 2 (reply to friend): Are you free next Tuesday evening?
Exercise 3 (travel note): Flight on May 1, arrives at 23:15 — write a short reminder.
Suggested answers
Answer 1: Reunião em 4 de julho de 2026 às 10h.
Answer 2: Você está disponível na terça-feira à noite?
Answer 3: Voo dia 1 de maio, chega às 23h15.
Quick reference: useful words and prepositions
Keep this mini glossary handy when writing dates and times in Brazilian Portuguese.
dia — day
mês — month
ano — year
hoje — today
amanhã — tomorrow
ontem — yesterday
amanhã de manhã — tomorrow morning
à tarde — in the afternoon
à noite — at night
às — contraction of a + as for times (use before time)
de — used between day, month, year
Conclusion
Writing dates, times, and days correctly in Brazilian Portuguese is mostly about following consistent patterns: day-month-year, use de between date parts, use às for times, lowercase months and days, and include manhã/tarde/noite when needed. Use the templates and checklist above to proofread messages, emails, and schedules before sending.
