Date Formatter

Format any date in 20+ formats including Unix timestamp and ISO variants

What is it and how does it work?

A date formatter takes a date and rewrites it in whatever format you need — from a Unix timestamp to ISO 8601, from "January 5, 2025" to "05/01/2025" and dozens of variations in between. Dates are deceptively messy because the same moment can be written countless ways, and different systems, countries and APIs each expect their own. Converting between formats by hand means remembering which pattern goes where and getting the order of day, month and year right, which is exactly where mistakes creep in.

The format that matters most for software is ISO 8601 (like 2025-01-05T14:30:00Z), because it is unambiguous and sorts correctly as plain text, which is why APIs and databases favour it. At the other end, a Unix timestamp counts seconds since 1970 and is how computers store time internally. A formatter lets you move freely between these machine formats and the human-readable ones, so you can take a date from a log, a spreadsheet or an API and present it however the next step requires. This tool runs in your browser.

Common use cases

• Converting for an API: turn a human date into ISO 8601 or a Unix timestamp that a system expects.
• Making a date readable: format a timestamp from a log or database into a clear, human-friendly string.
• Matching a regional style: reformat a date into the day-month-year or month-day-year order a document needs.

Frequently asked questions

What is ISO 8601 and why is it preferred?

ISO 8601 writes dates as year-month-day with time and timezone (2025-01-05T14:30:00Z). It is unambiguous worldwide and sorts correctly as text because the most significant part comes first, which is why APIs, databases and logs favour it over regional formats.

What is a Unix timestamp?

A Unix timestamp is the number of seconds (or milliseconds) since 1 January 1970 UTC, the moment computers use as their starting point for time. It is a single number with no formatting, which makes it compact and timezone-independent — ideal for storage, and easily converted back to a readable date.

Why do day-month-year and month-day-year cause confusion?

Different countries order dates differently, so 05/01/2025 is 5 January in much of the world but 1 May in the US. This ambiguity is exactly why ISO format exists. A formatter lets you output the unambiguous order a given audience or system expects.

Does formatting change the timezone?

Formatting presents the same moment in a chosen layout, but timezone handling is separate: a timestamp is usually UTC, and displaying it in a local zone shifts the visible time. Check whether a format includes a timezone (like the Z in ISO) so you know which zone the shown time refers to.

Time

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