It was confirmed to be 819 at the start of 2011, and Igiss always heavily hinted that the Sirius calendar syncs with ours for simplicities sake, so people would know the date. What about people dating posts using Sirius dates, for diaries, journals and story posts? How is anyone supposed to know what the date is if it's not synced?
The lore dates can be shifted up to match the super delayed release of 4.86.