Before present time

Because of the ambiguity of the dating of events, Before Present Time (BPT) is used after dates. An event that takes place 500 years ago would be written as 500 BPT. This purposefully leaves the era and date ambiguous compared to our history. However, Gregorian calendar dates still apply, such as January 10th, 500 BFT. As present time moves forward, the BFT date becomes larger. After 1 year has passed in the present, 500 BFT becomes 501 BFT, then 502 BFT, and so forth.