In English, years are designated with the letters AD (anno Domini, ‘year of the Lord’ in Latin); or, for years before that, BC (before Christ).

(But the BBC has suggested that presenters should use “religiously neutral” terms to avoid causing non-Christians offence. The secular terms they want to use are BCE (Before Common Era) and CE (Common Era).

And it gets funnier, in Australia there are plans for schools to use BCE, CE and BP – “before present” – in preference to the traditional language.  Surely everything in the past would be BP.)

More vocabulary on expressing the day / date here.