What is the regex pattern for date (iso 8601 yyyy-mm-dd)?

The regex pattern for date (iso 8601 yyyy-mm-dd) is: ^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$.

How does the date (iso 8601 yyyy-mm-dd) regex work?

^: Start of string. \d{4}: Four-digit year. -: Dash separator. (0[1-9]|1[0-2]): Month: 01-12. -: Dash separator. (0[1-9]|[12]\d|3[01]): Day: 01-31. $: End of string.

Regex for Date (ISO 8601 YYYY-MM-DD)

Matches dates in ISO 8601 format (YYYY-MM-DD). The international standard for date representation.

Pattern

/^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$/

Pattern Breakdown

Token	Explanation
^	Start of string
\d{4}	Four-digit year
-	Dash separator
(0[1-9]\|1[0-2])	Month: 01-12
-	Dash separator
(0[1-9]\|[12]\d\|3[01])	Day: 01-31
$	End of string

Test Examples

Input	Match?
2026-03-15	Match
1999-12-31	Match
2026-13-01	No match
2026-3-5	No match

Common Use Cases

API date field validation
Database date parsing
Log file date extraction
International date formatting

Variations

^\d{4}-\d{2}-\d{2}$

Without month/day range validation

Other Regex Patterns

Email Address US Phone Number International Phone Number URL IPv4 Address IPv6 Address Date (MM/DD/YYYY)Time (HH:MM, 24-hour)Credit Card Number US Social Security Number US ZIP Code Hex Color Code

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