So I noticed that none of the characters' birthdays are celebrated, nor do we know when Shinra came to join the 8th, and we haven't really seen seasons change, (well also there's little no vegetation except in where Vulcan lived) so it's hard to tell the passing of time.
I'd like to know kind of where on the calendar this whole thing started, and I'm kinda curious why 8th wouldn't celebrate each others' birthdays. I know it's not important and/or something they just don't show. By the whole thing, I mean the start of the anime with Shinra in the first episode.
Lastly we don't get any information on when Hika and Hina were born.