var hasOwn = require('../internals/has-own-property'); var defineBuiltIn = require('../internals/define-built-in'); var dateToPrimitive = require('../internals/date-to-primitive'); var wellKnownSymbol = require('../internals/well-known-symbol'); var TO_PRIMITIVE = wellKnownSymbol('toPrimitive'); var DatePrototype = Date.prototype; // `Date.prototype[@@toPrimitive]` method // https://tc39.es/ecma262/#sec-date.prototype-@@toprimitive if (!hasOwn(DatePrototype, TO_PRIMITIVE)) { defineBuiltIn(DatePrototype, TO_PRIMITIVE, dateToPrimitive); }