no issue
- client dates are sent as ISO format (moment(..).format())
- server dates are in JS Date format
>> when bookshelf fetches data from the database, all dates are transformed into JS dates
>> see `parse` helper function
- Bookshelf updates the model with the client data via Bookshelf's `set` function
- therefor Bookshelf uses a simple `isEqual` function from lodash to detect changes
- .previous(attr) and .get(attr) return false
- that has the concequence that dates are always marked as "changed"
- internally we use our `hasDateChanged` if we have to compare previous/updated dates
- but Bookshelf is not in our control for this case
f2fd075075