See pic related for one example. Some additional evidence I've found:
Tertullian tells us that this was also recorded in the Roman archives:
>In the same hour, too, the light of day was withdrawn, when the sun at the very time was in his noon blaze. Those who were not aware that this had been predicted about Christ thought it an eclipse. You yourselves have the account of this portent still in your archives.
That can be read here: ccel.org
And on the subject of official archives, the historian Movses Khorenatsi reports that the official archives of Osroene contained an exchange between its king, Abgar, and Tiberius Caesar. They discuss Christ, and King Abgar reports:
>During the time that they were crucifying him, the sun was darkened, the earth was moved, shaken…
That can be read here: newadvent.org
Plus there's geological evidence for the earthquake. the paper at academia.edu
It seems to me that any genuine examination of the evidence would have to conclude that, while Christ was on the cross, there truly was an inexplicable darkness and an earthquake.