PlaceTime TimeZones
I've also added support for timezones on the PlaceTime gregorian instant URIs so you can now write the date of the Apollo 11 moon landing in Eastern Daylight Time as:
http://placetime.com/instant/gregorian/1969-07-20T16:17:43-04:00
which is the same time as
http://placetime.com/instant/gregorian/1969-07-20T20:17:43Z
which in the UK would have been:
http://placetime.com/instant/gregorian/1969-07-20T21:17:43+01:00