Tools

Date Format Validator for Common Patterns

Validate and normalize dates across popular formats.

Date Format Validator

Validate and normalize common date formats so input is consistent. This helps avoid parsing errors and ambiguous data in forms or imports.

How to use the Date Format Validator

  1. Paste the date value.
  2. Click Validate.
  3. Review the normalized result.

Common use cases

  • Validating user-submitted date fields.
  • Cleaning date columns in CSV files.
  • Normalizing dates for APIs.
  • Reviewing ambiguous regional formats.

Tips & notes

  • Prefer ISO YYYY-MM-DD for clarity.
  • Watch for day/month swaps in ambiguous dates.
  • Use a format converter after validation.

Related time tools

  • Date Format Converter
  • ISO 8601 Formatter
  • Date to Timestamp Converter

FAQ

Which formats?
YYYY-MM-DD, MM/DD/YYYY, and DD-MM-YYYY.
Does it detect ambiguous dates?
It flags ambiguity when a date could match multiple formats.
Does it validate real dates?
Yes. Invalid dates are rejected.