Change date format

Convert date formats instantly in your browser. Auto-detect date input, choose exact input and output formats, convert multiple lines at once, and keep invalid values clearly marked.

⚙️ Date format options
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Line Status Detected input Original Result

Change date format - Explanation & examples

The Change date format tool helps you convert dates between common patterns like DD-MM-YYYY, MM/DD/YYYY, YYYY-MM-DD, month-name formats, ISO date-time strings, and Unix timestamps. You can process many lines at once with instant live preview.

⭐ What this date format converter can do

  • Convert between popular date formats in one click
  • Auto-detect input format where possible
  • Choose input format manually for precise conversion
  • Convert multiple date lines in bulk — one date per line or dates embedded in running text
  • Keep invalid or unrecognized dates unchanged and flag them
  • Adjust separators using dash, slash, or dot
  • Switch month names between long and short style
  • Output times in 12-hour or 24-hour format
  • Preserve source timezone or convert to local/UTC
  • Support 2-digit year input (e.g. 1-1-25)
  • Control leading zeros and full/short year format in output

⚙️ How to use the date converter

  1. Paste one or more lines in the input box. Each line can hold a single date or text with one or more dates embedded in it.
  2. Choose Auto detect or set the exact input format.
  3. Select your target output format and formatting options.
  4. Check the live output preview and line-by-line status table.
  5. Copy your result or download TXT/CSV output.

🔎 Example conversions

Examples:

31-12-2025           ->  2025-12-31
07/04/2026           ->  2026-07-04
2026-05-07T14:30:00Z ->  07-05-2026 16:30
1-1-25               ->  01-01-2025
Meeting on March 9, 2025 at noon  ->  Meeting on 09-03-2025 at noon

✅ Why this bulk date format tool is useful

  • Standardize date values before import/export jobs
  • Normalize logs and reports from different regions
  • Prepare consistent dates for spreadsheets and databases
  • Reduce manual edits and conversion mistakes

⚠️ Notes about invalid dates and detection

  • Invalid entries are not deleted and remain in place.
  • Auto detection handles common patterns, but ambiguous values (like 01-02-03) can be set manually.
  • Two-digit years are interpreted using a pivot: 00–49 → 2000–2049, 50–99 → 1950–1999.
  • Timezone conversion affects date-time values (for example ISO strings and Unix timestamps).

This tool is also known as

  • date format converter
  • change date format online
  • convert dates between formats
  • text date reformatter
  • date pattern converter

Frequently Asked Questions

It converts dates from one format to another, including DD-MM-YYYY, MM/DD/YYYY, YYYY-MM-DD, month-name dates, ISO date-time values, and Unix timestamps.

Yes. Paste multiple lines and the tool converts them in bulk with instant live preview. Each line can hold a single date or a sentence with one or more dates embedded anywhere in the text.

Yes. Auto detect is available for common patterns. You can also choose an exact input format manually.

They remain unchanged in the output and are clearly labeled as invalid in the line status table.

Yes. For numeric output formats you can select dash, slash, or dot separators.

Yes. When using month-name output you can switch between long names like January and short names like Jan.

Yes. You can choose either 12-hour or 24-hour time formatting for date-time output.

Yes. You can preserve source timezone behavior or convert date-time values to local time or UTC.

Yes. Use Copy for quick clipboard export, or Download as TXT/CSV for files.

Yes. Two-digit years are accepted in numeric date formats. Years 00–49 are mapped to 2000–2049 and years 50–99 are mapped to 1950–1999.

Yes. Use the Leading zeros option to choose between 05-05-2025 (with zeros) and 5-5-2025 (without). You can also select a 2-digit year output (YY) or a full 4-digit year (YYYY).

No. All processing runs locally in your browser to keep your date data private.