from zope.interface import Interface
from zope.publisher.interfaces.browser import IDefaultBrowserLayer


ISO_DATE_FORMAT = '%Y-%m-%d'


class IBrowserLayer(IDefaultBrowserLayer):
    """plone.app.event specific browser layer.
    """


class IICalendarImportEnabled(Interface):
    """Marker interface for contexts, where icalendar import is enabled.
    """
