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Standardize Date Formats in CSV - Convert to YYYY-MM-DD

Standardize date formats in CSV files. Convert all dates to YYYY-MM-DD format. Fix inconsistent dates. processed locally in your browser.

Quick start

Built for convert mixed dates into one standard format (yyyy-mm-dd).

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: A new file or report produced locally in your browser.

  1. 1Choose a supported file or use sample data when available.
  2. 2Set the options shown for this workflow.
  3. 3Process the file locally, inspect the result, and download a new copy.
Preparing your private workspace…

How to Standardize Dates

  1. 1Upload your CSV file with mixed date formats
  2. 2Tool detects and converts dates to YYYY-MM-DD format
  3. 3Download standardized CSV file

Why Use This Tool?

  • ✓Universal Format - ISO 8601 standard (YYYY-MM-DD)
  • ✓Auto-Detection - Recognizes common date formats
  • ✓Database-Ready - Compatible with SQL databases
  • ✓Fix Inconsistencies - Unify mixed formats
  • ✓Preserve Non-Dates - Only affects date-like values

Frequently Asked Questions

What date formats are recognized?

The tool recognizes common formats like MM/DD/YYYY, DD-MM-YYYY, and text dates like "Jan 15, 2024". All are converted to YYYY-MM-DD.

What if a date cannot be parsed?

Values that cannot be reliably parsed as dates are left unchanged. This prevents accidental corruption of non-date data.

Why YYYY-MM-DD format?

It's the ISO 8601 international standard, sorts correctly alphabetically, and is universally accepted by databases and programming languages.