http://tools.ietf.org/html/rfc4791#section-8.2.1.1
as written here
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Restrict time range of syncronisation
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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.
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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.
