For some reason I can't seem to activate the date option for any of my characters. Sex is available, but date isn't which is a little limiting in trying to improve relationships. 

is it also not available when you only select one character?

Yeah, even when only selecting one and not having the MC selected etc. I ended up restarting entirely. I was only on day 10 so it wasn't that big of a deal. It's working now on this play through. I'm not entirely sure what happened or what caused it to freak out.

Could be corrupted save or bad import.     I've had (saved) imports do strange things before----ie,   import,   play,  save [will save as CURRENT ver]  then LOAD   (loads as CURRENT ver)  Lots of changes between versions.

Same issue here