Date Format (YYYY-MM-DD) Regex Pattern

Match and validate ISO 8601 date format (YYYY-MM-DD) using regex. Includes month and day range validation.

The Pattern

/\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])/g

How It Works

Token	Meaning
`\d{4}`	Exactly 4 digits for the year
`-`	Literal dash separator
`(?:0[1-9]\|1[0-2])`	Month: 01-09 or 10-12
`-`	Literal dash separator
`(?:0[1-9]\|[12]\d\|3[01])`	Day: 01-09, 10-29, or 30-31

Test Cases

✅2024-01-15Match

✅2024-12-31Match

✅2025-06-01Match

❌2024-13-01No match

❌2024-00-15No match

❌2024-01-32No match

Code Examples

javascript

const dateRegex = /\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])/g;
const text = "Events on 2024-01-15, 2024-12-31, and invalid 2024-13-01";
const matches = text.match(dateRegex);
console.log(matches); // ["2024-01-15", "2024-12-31"]

python

import re
date_regex = r'\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])'
text = "Events on 2024-01-15, 2024-12-31, and invalid 2024-13-01"
matches = re.findall(date_regex, text)
print(matches)  # ['2024-01-15', '2024-12-31']

Common Use Cases

Form validation - ensure correct date format input
Log parsing - extract dates from structured logs
Data migration - identify date fields in datasets
API validation - enforce ISO date format in requests

Related Patterns

Phone Number Semantic Version (SemVer)UUID

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