I believe it's like 949 years between the two.

For further reference (and character background ideas), some of the high point mentioned in ESO stories, so you can put things in relation:

Mages Guild forms - 2E 230 (Vanus Galerion is no spring chicken...)

Syffrim form - 2E 320 (later become "Fighters Guild")

Dark Brotherhood forms - 2E 358 (or rather, splits from Morag Tong)

Orsinium sacked - 2E 431 (Yes, that grudge is 150 years old at the time of ESO!)

Reachmen invade High Rock - 2E 541 (Black Drake)
Daggerfall Covenant forms - 2E 542 (Only breton kings alliance at this time)

Knarhaten Flu - 2E 560 (Kothringi and Lilmothiit become extinct in the following years)

Ransers War - 2E 566
DC reforms in aftermath - 2E 567 (now with redguards and orcs as well)

Akaviri Invasion, EP forms - 2E 572

Varens Rebellion - 2E 576

Varen becomes emperor - 2E 577

Soulburst - 2E 578 (fall of the Emperor, begin of the interregnum)

Ayrenn crowned, AD forms - 2E 580 (and the three banners war begins in earnest)

ESO - 2E 582+
(the mainstory is set in 582, Imperial City would fit in there just as well, the "after mainstroy" regions like Craglorn, Orsinium or the guild DLCs in 583, and the "dadric conspiracy" storyline with Vvardenfell and clockwork city might be happening 584 or so as time moves on in tamriel...)

...no major fixed events in lore... (meaning ZOS can practically do whatever) until...

AD reforms - 2E 830

Tiber wars begin - 2E 856

Dargoth Ur awakens - 2E 882

TES-A:Redguard - 2E 864

Tiber Septim finally conquers all and becomes emperor - 2E 896 (end of the second era)

...

TES-L:Battlespire - 3E 398

TES:Arena - 3E 399

TES-2:Daggerfall - 3E 405

TES-3:Morrowind - 3E 427

TES-4:Oblivion - 3E 433 (end of the third era)

TES-5:Skyrim - 4E 201