figure 1 (timeline of the Anno Domini era)

* year 1 ₁ year 2 ₂ year 3 ₃ ……… _{time
(in years)}

in which year 1 is the starting year of our era

figure 2 (timeline of the complete Christian era)

……… _-3 year -3 _-2 year -2 _-1 year -1 ₀ year 1 ₁ year 2 ₂ year 3 ₃ ……… _{time (in years)}

in which year -x = the year x before Christ

……… _-3 year -2 _-2 year -1 _-1 year 0 ₀ year 1 ₁ year 2 ₂ year 3 ₃ ……… _{time
(in years)}

in which year 0 began two days earlier and ended one day earlier than the year 1 before Christ