I know that to pronounce dates you have to divide the date of the year in two parts: 1850 eighteen fifty. But what if you have to pronouce a year like 155 a.d? I would say one hundred and fiftyfive. is it correct?
There are various ways for various dates, Rip, somewhat dependent on context. Here, if the topic is ancient Rome, and a date or two has been mentioned already, I'd just say 'one fifty-five'.
. . . . and PLEASE nobody ask about 2012.