| 'use strict'; | 
| 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); | 
| } |