isValidDateString

isValidDateString(date): boolean

Validate if a string is a valid date in YYYY-MM-DD format. Checks both format and actual date validity.

Parameters

date

string

Returns

boolean

Example

isValidDateString("2025-12-25"); // true
isValidDateString("2025-02-30"); // false (invalid date)
isValidDateString("25-12-2025"); // false (wrong format)