iCalendar

[westurner]

"A tool that periodically checks downtime information for services you use, indicating any upcoming downtime in your calendar or notify you by email or OS X notification."

iCalendar may be helpful here.

• http://en.wikipedia.org/wiki/ICalendar#Core_object

[madrobby]

Indeed a converter from the downtime.json format to iCalender, ideally in the form of something that you can easily subscribe to would be awesome.

[westurner]

ical2rss and/or rss2ical tools may be helpful here.