Add Date.now()
Add Date.prototype.toISOString()
Removed outdated comments
Make Date.prototype.toJSON() (builtinJSON_toJSON) correspond to the 15.9.5.44 algorithm
Fix: Object setter should be called with only 1 argument, the assigned value

8.6.1, Table 6 — Attributes of a Named Accessor Property [[Set]]
Fix: Call getter/setter with correct this value, [[Get]] 8.12.3(.6) [[Put]] 8.12.5(.5b)
Add ES5 getter/setter syntax, 11.1.5