Be sure that you already studied all the files about Robert's wife.
You have to walk Robert slowly on each regression.
For you the gamer to know the Date and time: Use the microcassette in tape recorder on Robert and he remembers the time 9:30 PM.
Use the cellphone and then select calendar. See that the Wednesday before October 12 is the 8th.
Do regression again. Click on memory 2: Change the date to October 08, 2008 and the time to 9:30 PM.
Talk to Robert again. He still can't remember their anniversary date.
--- Then work on Station name and Thai restaurant.
Go from there.
I have saved game after Robert's regression; if you want that route.