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

Standardize date formats in CSV files. Convert all dates to YYYY-MM-DD format. Free CSV date formatter. Fix inconsistent dates. 100% private.

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Standardize Dates

Convert mixed dates into one standard format (YYYY-MM-DD).

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.