Skip to main content

Date Format Converter

Quick answer

One date in every common notation: ISO 8601, US, EU and RFC 2822, so day-first vs month-first ambiguity is resolved.

  • Free, no sign-up, works on any device.

Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.

How the Date Format Converter Works

The same date is re-rendered through each standard format: October 16, 2026 becomes 2026-10-16 (ISO 8601), 10/16/2026 (US), 16/10/2026 (day-first) and Fri, 16 Oct 2026 (RFC 2822). ISO 8601 always puts the year first, which is why it is the safe interchange format.

Use Cases

Convert dates for use in programming and databases

Standardize date formats in official documents

Convert dates between US and European formats

Get Unix timestamps for technical applications

Format dates for reports and presentations

Tips

  • 1

    Use ISO 8601 format for international compatibility

  • 2

    Understand the difference between DD/MM and MM/DD

  • 3

    Use Unix timestamps for precision in programming

Common Mistakes

  • Confusing US format (month/day) with European format (day/month)

  • Forgetting that Unix timestamp starts from January 1, 1970

  • Not accounting for timezone in conversions

FAQs

What is ISO 8601 format?

It is the international standard for writing dates as YYYY-MM-DD (year-month-day), and is the recommended format for international and programming use.

What is the difference between US and European formats?

US format writes the month first (MM/DD/YYYY), while European writes the day first (DD/MM/YYYY). For example: 03/05/2024 means March 5 in the US and May 3 in Europe.

What is a Unix timestamp?

It is the number of seconds elapsed since January 1, 1970 at 00:00:00 UTC. It is widely used in programming for storing dates.

Related tools

Pick another tool to continue your calculation.

⏳

Countdown Calculator

Live countdown in days, hours and minutes to any future date. Great for launches, exams and travel; works down to any date you pick, past or future.

🌙

Ramadan Countdown

Calculate days remaining until next Ramadan.

✝️

Holy Week Dates Calculator

Free Holy Week calculator. Find exact dates for Palm Sunday, Maundy Thursday, Good Friday, and Easter for any year.

📅

Date Difference Calculator

Calculate difference between two dates.

📆

Add Days to Date Calculator

Date arithmetic done on real calendar months: Oct 16, 2026 plus 45 days lands on Nov 30, 2026. Subtraction works the same way for deadlines and back-planning.

➕

Date Adder

Add days, months, or years to a date.