Date Validator
Validate dates in ISO, US, or European formats — catches Feb 30 and leap-year errors.
Runs locally in your browser. Your input is not uploaded.
How to Use
- 1
Pick the format
ISO, US, European, or dotted.
- 2
Paste dates
One per line.
- 3
Read the verdicts
Valid dates show the weekday; failures explain exactly why.
Frequently Asked Questions
- Out-of-range months, days beyond the month's length (April 31), and February 29 in non-leap years — all checked against real calendar rules, not just format patterns.
Related Tools
Email ValidatorValidate email address syntax with detailed feedbackURL ValidatorCheck URL format and parse components for validityIP Address ValidatorValidate IPv4 and IPv6 address formatMAC Address ValidatorValidate MAC address format in multiple notationsUUID ValidatorValidate UUID format and detect version (v1–v5)Credit Card ValidatorValidate credit card numbers with Luhn algorithm (no data sent)Phone Number ValidatorValidate international phone number formatsDomain ValidatorValidate domain name and hostname syntax