Date Formatter — Pick a date and see it formatted in eight common ways at once. Useful for picking the right format for a CSV export, an API payload, a log line, or a UI display. The ISO week format (2026-W03) is a standard in project management and finance.
All formatting happens in your browser. No data leaves your device.
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What is Date Formatter?
Pick a date and see it formatted in eight common ways at once. Useful for picking the right format for a CSV export, an API payload, a log line, or a UI display. The ISO week format (2026-W03) is a standard in project management and finance.
You can also paste a Unix timestamp in seconds and see the same eight formats. The tool uses the browser's locale for the human-readable forms, so "long" and "short" reflect the user's language.
How to use it
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Pick a date
Use the date/time picker, or paste a Unix timestamp in seconds.
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Read the formats
All eight formats update live.
Examples
A modern ISO timestamp
The format most APIs use.
Result: 2026-01-15T12:34:56.000Z
A human-readable date
For a UI or report.
Result: Thursday, January 15, 2026
Frequently asked questions
Related guides
What Is a Unix Timestamp and Why Do Programmers Use It?
A Unix timestamp is the number of seconds (or milliseconds) since January 1, 1970, UTC. This guide explains why it exists, how it works, and the practical consequences — including the Y2038 problem and the 2038 bug.
How to Calculate Age Exactly (in Years, Months, and Days)
A practical guide to age math: the difference between calendar years and elapsed time, why "years old" is fuzzier than you think, how to handle leap years and time zones, and how to get an exact result in your browser without uploading your birth date to anyone.
How to Calculate Days Between Two Dates (and Add or Subtract Days)
Calculating the days between two dates, or adding days to a date, looks simple but has edge cases. Learn the rules for days, weeks, months, and years, and how to avoid the month-end and leap-year traps.
Related tools
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Last reviewed: 2026-09-28