📅 Date Format Converter
By ToolNimba Editorial Team · Updated 2026-06-19
The date is treated as a calendar date (no time zone shift), so every format shows the same day.
This date format converter takes one date and shows it in every common style at once: ISO 8601 (YYYY-MM-DD), US (MM/DD/YYYY), European (DD/MM/YYYY), long (Month D, YYYY), the Unix timestamp, and the day of the week. Pick a date and copy whichever format you need, no manual reformatting and no guessing whether 05/06 means May or June.
What is the Date Format Converter?
A date is a single calendar day, but the way we write it down is far from universal. The same day, the sixth of May 2026, is written 2026-05-06 in ISO 8601, 05/06/2026 in the United States, and 06/05/2026 across most of Europe. Because the US and European orders swap the day and month, a string like 05/06/2026 is genuinely ambiguous unless you already know which convention produced it. This tool removes that guesswork by showing one chosen day in all the major formats side by side.
ISO 8601 (YYYY-MM-DD) is the international standard and the safest choice for anything technical. It sorts correctly as plain text, it is unambiguous worldwide, and it is what databases, spreadsheets, APIs and file names should use. The long form (Month D, YYYY) spells the month out, so it can never be misread, which is why it suits letters, articles and printed documents. The Unix timestamp is a different idea entirely: it is the number of seconds since 1 January 1970 at midnight UTC, the format computers prefer for storing and comparing moments in time.
This converter treats your input as a pure calendar date with no time-of-day and no time-zone offset, so every output describes the exact same day you picked. The Unix timestamp shown is that day at midnight UTC. The weekday is computed from the date itself using the same rules the Gregorian calendar follows, so 19 June 2026, for example, always resolves to the correct day name regardless of where you are reading this.
When to use it
- Rewriting a US date (MM/DD/YYYY) into the European order (DD/MM/YYYY) or vice versa without misreading the day and month.
- Converting a human date into ISO 8601 (YYYY-MM-DD) for a database field, spreadsheet column, file name or API request.
- Finding the Unix timestamp for a given calendar day to use in code or a config file.
- Looking up which day of the week a past or future date falls on.
- Turning a plain date into the long written form (Month D, YYYY) for a letter, report or invitation.
How to use the Date Format Converter
- Pick a date in the date field, or click Use today to load the current date.
- Read off the date in ISO 8601, US, European, long, weekday and Unix timestamp form.
- Click Copy next to any format to put that exact string on your clipboard.
- Change the date at any time to update every format instantly.
Formula & method
Worked examples
You have the date 2024-06-19 and want it in every common format.
- ISO 8601: keep the parts in year, month, day order = 2024-06-19
- US: place month first, then day, then year = 06/19/2024
- European: place day first, then month, then year = 19/06/2024
- Long: spell the month and add the day and year = June 19, 2024
- Weekday: 19 June 2024 falls on a Wednesday
- Unix timestamp: seconds from 1970-01-01 UTC to 2024-06-19 midnight UTC = 1718755200
Result: ISO 2024-06-19, US 06/19/2024, EU 19/06/2024, long June 19, 2024, Wednesday, Unix 1718755200
You see the US date 12/25/2000 and want to confirm the day and other formats.
- Read it as US order: month 12, day 25, year 2000
- ISO 8601: 2000-12-25
- European: 25/12/2000
- Long: December 25, 2000
- Weekday: 25 December 2000 was a Monday
- Unix timestamp: 2000-12-25 midnight UTC = 977702400
Result: ISO 2000-12-25, EU 25/12/2000, long December 25, 2000, Monday, Unix 977702400
The same day (1 January 2025) written in each format
| Format | Pattern | Output |
|---|---|---|
| ISO 8601 | YYYY-MM-DD | 2025-01-01 |
| US | MM/DD/YYYY | 01/01/2025 |
| European | DD/MM/YYYY | 01/01/2025 |
| Long | Month D, YYYY | January 1, 2025 |
| Weekday | day name | Wednesday |
| Unix timestamp | seconds since 1970 UTC | 1735689600 |
Where each date format is commonly used
| Format | Typical use |
|---|---|
| ISO 8601 (YYYY-MM-DD) | Databases, spreadsheets, APIs, file names, anything that must sort or be unambiguous |
| US (MM/DD/YYYY) | Everyday writing in the United States |
| European (DD/MM/YYYY) | Everyday writing across most of Europe and much of the world |
| Long (Month D, YYYY) | Letters, articles, invitations and printed documents |
| Unix timestamp | Code, logs and config files that store moments as a single number |
Common mistakes to avoid
- Reading an ambiguous slash date the wrong way. A date like 05/06/2026 is May 6 in the US and 6 May in Europe. Always confirm which order the source uses before converting, the day and month can swap meaning entirely.
- Expecting the Unix timestamp to include a time of day. This tool treats the input as a calendar day, so the Unix value is that day at midnight UTC. If you need a specific hour or minute, you want a full date-and-time tool instead.
- Assuming the weekday depends on your location. The day of the week is a property of the calendar date itself. 19 June 2026 is a Friday everywhere, it does not change with your time zone.
- Using a written month order in technical fields. Spreadsheets and databases sort and compare dates best in ISO 8601. Storing 06/19/2024 or June 19, 2024 in a data field often breaks sorting and parsing.
Glossary
- ISO 8601
- The international date standard that writes dates as YYYY-MM-DD, which sorts correctly and reads the same everywhere.
- Unix timestamp
- The number of whole seconds elapsed since 1 January 1970 at midnight UTC, used by computers to store a moment in time.
- UTC
- Coordinated Universal Time, the global reference time zone with no daylight saving offset.
- Long date
- A date with the month spelled out, such as June 19, 2026, so it can never be misread.
- Gregorian calendar
- The civil calendar used worldwide today, which fixes which weekday each date falls on.
Frequently asked questions
What is the ISO 8601 date format?
ISO 8601 writes a date as YYYY-MM-DD, for example 2026-06-19. It is the international standard because it is unambiguous worldwide and sorts correctly as plain text, which is why databases, spreadsheets and APIs prefer it.
What is the difference between US and European date formats?
The US format is MM/DD/YYYY (month first) while the European format is DD/MM/YYYY (day first). The same string can mean two different days, so 05/06/2026 is May 6 in the US and 6 May in Europe.
How do I convert a date to a Unix timestamp?
Pick the date and read the Unix timestamp field. It shows the number of seconds from 1 January 1970 at midnight UTC to your chosen day at midnight UTC. The converter calculates it for you automatically.
Does this tool change the date for my time zone?
No. The date is treated as a pure calendar day, so every format, including the weekday and the Unix timestamp at midnight UTC, describes the exact same day you picked, with no time-zone shift.
How is the day of the week worked out?
The weekday is derived directly from the calendar date using the Gregorian calendar rules. It depends only on the date, not on your location, so a given date always returns the same day name.
Which date format should I use in a spreadsheet or database?
Use ISO 8601 (YYYY-MM-DD). It sorts in chronological order as text, is never ambiguous, and is the format spreadsheets, databases and APIs parse most reliably. Save the written or slash forms for documents people read.