The [@@toPrimitive]() method converts a Date object to a primitive value.

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Return value

The primitive value of the given Date object. Depending on the argument, the method can return either a string or a number.


The [@@toPrimitive]() method of the Date object returns a primitive value, that is either of type number or of type string.

If hint is string or default, [@@toPrimitive]() tries to call the toString method. If the toString property does not exist, it tries to call the valueOf method and if the valueOf does not exist either, [@@toPrimitive]() throws a TypeError.

If hint is number, [@@toPrimitive]() first tries to call valueOf, and if that fails, it calls toString.

JavaScript calls the [@@toPrimitive]() method to convert an object to a primitive value. You rarely need to invoke the [@@toPrimitive]() method yourself; JavaScript automatically invokes it when encountering an object where a primitive value is expected.


Returning date primitives

const testDate = new Date(1590757517834);
// "Date Fri May 29 2020 14:05:17 GMT+0100 (British Summer Time)"

// Returns "Date Fri May 29 2020 14:05:17 GMT+0100 (British Summer Time)"

// Returns "1590757517834"

// Returns "Date Fri May 29 2020 14:05:17 GMT+0100 (British Summer Time)"


ECMAScript Language Specification
# sec-date.prototype-@@toprimitive

Browser compatibility

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See also