cljs-time.extend

### Optional namespace to extend goog.date.* DateTime types

Equality of goog.date.* DateTime types works differently to
clj-time/Joda's equality. Optionally require this namespace
to extend cljs.core/IEquiv protocol for:

 * goog.date.Date
 * goog.date.DateTime
 * goog.date.UtcDateTime

hash-parts

(hash-parts type-hash ms-since-epoch offset)