Date Format Converter Convert dates between US, European, ISO, and other popular formats simultaneously.

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Date Format Converter

Convert dates between US, European, ISO, and other popular formats simultaneously.

Select a Date

Pick a date using the date picker.

View All Formats

See the date displayed in 12+ different formats simultaneously.

Copy Any Format

Click the copy button next to any format to copy it to your clipboard.

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What Is Date Format Converter?

The Date Format Converter takes a single date input and instantly displays it in over 12 different date format conventions used around the world. See your date in ISO 8601 (YYYY-MM-DD), US format (MM/DD/YYYY), European format (DD/MM/YYYY), UK format (DD-MM-YYYY), long US format (January 15, 2024), long European format (15 January 2024), short format, dot-separated, compact (YYYYMMDD), Unix timestamp, relative time, and RFC 2822. Each format has a one-click copy button for immediate use. This eliminates the guesswork and manual reformatting that comes with working across different regional date conventions, making it perfect for developers, data analysts, and international communicators.

Why Use Date Format Converter?

Over 12 date formats generated at once
One-click copy for each format
Covers US, European, ISO, RFC, and compact formats
Includes Unix timestamp and relative time
No sign-up or installation needed
Updates in real-time as you change the date

Common Use Cases

International Communication

Clarify date ambiguity when communicating across US and European conventions.

Data Import/Export

Reformat dates for CSV imports, API requests, or database migrations.

Document Formatting

Find the right date format for formal documents, reports, or legal filings.

Localization

Preview how dates will appear in different regional formats for app localization.

Log Timestamps

Convert between human-readable dates and machine formats like Unix timestamps.

Technical Guide

The converter parses the input date using JavaScript's Date constructor with a midnight time component (T00:00:00) to avoid timezone shifts. Each format is constructed using a combination of getFullYear(), getMonth()+1, getDate(), and toLocaleDateString() with specific locale and option parameters. The US long format uses {month: "long", day: "numeric", year: "numeric"}, while the European long format reorders these fields. The compact format concatenates zero-padded year, month, and day without separators. The Unix timestamp divides getTime() by 1000 and floors the result. The relative time calculation compares the date to Date.now() and expresses the difference in the most appropriate unit (days, months, or years ago/from now). RFC 2822 format is constructed manually following the standard's specification.

Tips & Best Practices

1
Use ISO format (YYYY-MM-DD) for databases and APIs — it sorts correctly alphabetically
2
Be cautious with MM/DD and DD/MM formats — they can cause confusion between US and EU users
3
The compact format (YYYYMMDD) is ideal for file names and version strings
4
RFC 2822 format is required for email headers and some HTTP headers
5
Unix timestamps are timezone-independent — they always represent UTC

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Frequently Asked Questions

Q What is the safest date format to use?

ISO 8601 (YYYY-MM-DD) is the international standard and avoids ambiguity between US (MM/DD) and European (DD/MM) conventions.

Q Why are US and European formats confusing?

The US uses MM/DD/YYYY while Europe uses DD/MM/YYYY. A date like 03/04/2024 could mean March 4 or April 3 depending on convention.

Q What is RFC 2822 format used for?

RFC 2822 is the standard for email message headers and is also used in HTTP headers. It looks like: Mon, 15 Jan 2024 00:00:00 +0000.

Q Can I convert from any input format?

The tool uses a date picker for unambiguous input. Type-based parsing is limited to formats that JavaScript's Date constructor can interpret.

Q What does the relative time show?

It shows how long ago or how far in the future the date is from today, expressed in the most natural unit (e.g., "3 months ago" or "2 days from now").

About This Tool

Date Format Converter is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.