Date Formatter

Convert and format dates between standards. Auto-detect input format, preview results, and download formatted dates. All in your browser.

Custom format tokens: YYYY (year), MM (month), DD (day), HH (24h), mm (minute), ss (second), ddd (short day), dddd (full day), MMM (short month), MMMM (full month)

About Date Formatter

Format and convert dates between various standards. Perfect for cleaning up date columns in spreadsheets, preparing data for APIs, or standardizing date formats across datasets. All processing is local and private.

Auto-Detect

Automatically detects the input date format — ISO 8601, US, EU, RFC 2822, Unix timestamps, and more.

7+ Output Formats

Convert to ISO 8601, US (MM/DD/YYYY), EU (DD/MM/YYYY), RFC 2822, Unix timestamps, or custom patterns.

Timezone Support

Convert dates in local timezone or UTC. Ideal for working with data from multiple timezones.

Batch Processing

Process hundreds of dates at once. Preview original and converted side by side. Download results.

📋 Common Use Cases

Pre-Analysis Data Prep

Clean CSV and spreadsheet data before analysis. Standardize formats, remove duplicates, and fix inconsistent values that would skew results.

PII Redaction

Remove or mask personally identifiable information before sharing datasets with third parties or publishing open data. Comply with privacy regulations.

Text File Parsing

Convert unstructured text files into organized columns. Extract structured data from logs, reports, or exported text dumps.

Database Cleanup

Prepare data for database import by fixing malformed records, standardizing field formats, and removing invalid characters.

🪜 How to Use This Tool

  1. Load your data
    Paste raw text or upload a file. The tool auto-detects delimiters and structure in CSV, TSV, and fixed-width formats.
  2. Choose cleaning operations
    Select what to do — remove duplicates, trim whitespace, anonymize PII, split columns, or standardize formats.
  3. Preview changes
    Review a before/after comparison of your data. Adjust cleaning rules if needed before applying to the full dataset.
  4. Download cleaned data
    Export as CSV, JSON, or copy to clipboard. Original data is never uploaded — all cleaning happens locally.

📚 Related Guides

Frequently Asked Questions

Is this data tool free?▼
Yes. All data tools are completely free. No signup needed.
Is my data sent to a server?▼
No. All data processing happens in your browser. Your JSON, CSV, SQL, and text data never leaves your device.
Can these handle large files?▼
JSON formatter and CSV tools comfortably handle files up to ~10MB in browser. Performance depends on your device for larger datasets.