Date Format Converter

Need to convert a date like 03/21/2026 into 2026-03-21? This tool helps you switch between common date formats without mixing up month and day.

Convert one date format into another in a focused workflow

Use this tool when a spreadsheet, form field, report, import file, or pasted note expects a different date layout than the one you currently have.

Date value

Use the source format that matches your input exactly, then choose the target format you want to copy.

From format To format

YYYY-MM-DD 2026-03-21

MM/DD/YYYY 03/21/2026

DD/MM/YYYY 21/03/2026

MMM D, YYYY Mar 21, 2026

YYYY-MM-DD HH:mm 2026-03-21 14:30

Paste a date value, choose the matching source format, and click Convert.

Converted value

Choose formats and click Convert.

The converted date string and parsed interpretation will appear here.

Not converted yet Interpreted date

Not converted yet ISO-style fallback

Waiting for conversion Format pair

Paste or type the date value you want to convert.
Choose the source format that matches the input exactly.
Choose the target format you want to copy.
Click Convert to review the converted date, parsed interpretation, and ISO-style fallback.
Use Example to load a sample conversion or Clear to reset the tool.

Convert US date to ISO
Input: `03/21/2026`
Output: `2026-03-21`
Why this matters: Many spreadsheets, APIs, and databases expect ISO format. Using the wrong format can break sorting or imports.
Convert European date to US format
Input: `21/03/2026`
Output: `03/21/2026`
Why this matters: This helps when a date from a European report or form needs to be rewritten for a US-facing workflow without swapping day and month by mistake.
Convert written date to numeric format
Input: `March 21, 2026`
Output: `2026-03-21`
Why this matters: Written dates are easy to read, but numeric formats are easier to sort, validate, and paste into forms or CSV files.

The same date string can mean different things in different contexts. A value like `03/04/2026` might mean March 4 in one system and April 3 in another.

Different tools and regions also expect different formats, including ISO-style `YYYY-MM-DD`, US-style `MM/DD/YYYY`, and European-style `DD/MM/YYYY`.

Some inputs are not just different, but invalid or ambiguous. A date like `2024-02-30` should fail, and a short numeric date should not be guessed blindly.

This tool avoids guessing and converts the date based on the exact format you select.

This tool converts one readable date string into another readable date format. Instead of manually moving month, day, and year positions, you choose the input format you already have, choose the output format you need, and copy the converted value.

A date format converter is most useful when the same calendar date has to move between systems or regions. Common examples include changing `03/21/2026` into `2026-03-21` for spreadsheets or databases, rewriting `21/03/2026` for a US-facing form, or converting written dates from notes into a clean numeric format before pasting them into an API payload or CSV file.

`YYYY-MM-DD` is the ISO-style format used in many databases, APIs, and exports because it sorts cleanly and avoids most ambiguity.

`MM/DD/YYYY` is common in the United States, where the month comes first.

`DD/MM/YYYY` is widely used in Europe and many other countries, where the day comes first.

`Month Day, Year` formats such as `March 21, 2026` are easier for people to read in documents, emails, and reports, but they are less convenient for structured data.

Watch for month-first and day-first confusion when you switch between `MM/DD/YYYY` and `DD/MM/YYYY`.

Check that the date is valid before converting. A value like `2024-02-30` should fail because that day does not exist.

Treat short numeric dates such as `03/04/2026` carefully. Without context, it could mean March 4 or April 3.

Use Unix Timestamp Converter when you are working with Unix seconds, milliseconds, or machine timestamps. Use Date Format Converter when your input is already a readable date string and you only need to rewrite it into another human-readable format.

What date format is YYYY-MM-DD?

It is the ISO-style year-month-day format. Many databases, spreadsheets, and APIs prefer it because it is consistent and easy to sort.

How do I convert MM/DD/YYYY to DD/MM/YYYY?

Enter the date, choose `MM/DD/YYYY` as the source format, choose `DD/MM/YYYY` as the target format, and convert it.

Why does the same date look different in different countries?

Different regions use different day-month-year orders. The date is the same, but the local writing convention changes how it appears.

What happens if the input does not match the selected format?

The tool shows an error instead of guessing, which helps avoid converting an ambiguous or invalid date into the wrong value.

Date Format Converter