validateDate

validateDate(string, pattern?) → boolean · Date & Time

Validate whether a string is a valid date (ISO 8601 or custom pattern).

• string (required): the date string to validate

• pattern (optional): format pattern to validate against

validateDate("2026-05-01")               // true
validateDate("2026-13-01")               // false (month 13 invalid)
validateDate("01/05/2026", "dd/MM/yyyy") // true