The JavaScript exception "invalid date" occurs when an invalid date is attempted to be converted to an ISO date string.

Message

RangeError: Invalid time value (V8-based)RangeError: invalid date (Firefox)RangeError: Invalid Date (Safari)

Error type

What went wrong?

You are converting aninvalid date value to an ISO date string. This usually happens in one of three ways:

• Calling thetoISOString() method
• Calling thetoJSON() method, which implicitly callstoISOString
• UsingJSON.stringify() to stringify the date, which implicitly callstoJSON

Aninvalid date is produced when you attempt to parse an invalid date string, or set the timestamp to an out-of-bounds value. Invalid dates usually cause all date methods to returnNaN or other special values. However, such dates do not have valid ISO string representations, so an error is thrown when you attempt to do so.

Examples

Invalid cases

const invalid = new Date("nothing");invalid.toISOString(); // RangeError: invalid dateinvalid.toJSON(); // RangeError: invalid dateJSON.stringify({ date: invalid }); // RangeError: invalid date

However, most other methods return special values:

invalid.toString(); // "Invalid Date"invalid.getDate(); // NaN

For more details, see theDate.parse() documentation.

Valid cases

new Date("05 October 2011 14:48 UTC").toISOString(); // "2011-10-05T14:48:00.000Z"new Date(1317826080).toISOString(); // "2011-10-05T14:48:00.000Z"

See also

• Date
• Date.prototype.parse()
• Date.prototype.toISOString()