For a workaround you could use a technique similar to this: [how-to] Use a global lookup array on all of your apps in your organization's javascript settings.
Store your global momentjs formats like:
window.dataFormat = ""MMM d, yyyy""
Then you could this in all of your data output: moment(myDate.value).format(dataFormat)
A similar technique (maybe on an app level instead) would also get your time zones.