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Everyday Life

What Day Was It? Day of the Week Finder

Find out what day of the week any date falls on — past, present, or future. Works for any year.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

Como Funciona

A fórmula de Zeller calcula o dia para qualquer data no calendário gregoriano. O 7 de setembro de 1822 (Independência do Brasil) era um sábado. O 15 de novembro de 1889 (Proclamação da República) era uma sexta-feira.

Curiosidades

O 13 cai numa sexta 1-3 vezes por ano. O calendário se repete a cada 400 anos (146.097 dias).

⚡ CalcWolf Insight

The day-of-week calculator is one of the most frequently used "curiosity" calculators — people check their birthday, historical events, and future holidays. Users often check multiple dates in one session, driving excellent time-on-page metrics.

Frequently asked questions
Qual dia eu nasci?▾
Insira sua data para descobrir.
Como calcular de cabeça?▾
Método Doomsday de John Conway — aprende-se em 30 min.
✓ Math logic verified against primary sources → See our verification process
Kevin Glover
Founder, CalcWolf · GLVTS · Blickr
All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →
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