Restrict time range of syncronisation

[AutoImport-khades]

http://tools.ietf.org/html/rfc4791#section-8.2.1.1
as written here

[AutoImport-ghost]

This would be nice. Syncing my calendar takes quite a bit of time (30-60 seconds), presumably because it’s syncing years worth of information every time?

Ideally the initial (and perhaps a manual “full/force resync”) sync would sync the complete calendar history, but automatic syncs would only sync events >= one week ago or so.

[rfc2822]

It doesn’t sync the information every time but at least the ETag (hash) for every iCal.

Partial syncs will be a very challenging task, but I will have a look at it when other things are stable.