Yeah this is heartbreaking - the first time it happened I thought I'd just forgotten to save (and lost the autosave when it crashed), just come back to it this morning after redoing my mission last night and saving (and checking the saves were present and correct in the load save section- yup!) aaaaand it's back to Year One, Day 59 - 3h, 58m (all the saves are this time and date- isn't that odd? Even the quicksave 7 which I made before I quit last night- it's like it reverted back despite it showing correctly before I switched off).
The game is epic, I feel for you all having this issue too!! I'll try some of these temporary fixes but really it's not good enough, this needs to be fixed properly. I don't want to play feeling that I could well just lose everything I've done... I am meant to be studying :-P