Yes, it seems that way. Previously, the zero day was 12/31/1987, so the time since that day was the basis for the sine and cosine formulas. And because of the 12-year disparity between real dates and game dates, that zero day would equate to 12/31/1999 for the in-game date.
This is now changed and the zero day appears to be 12/31/1999 (12/31/2027 in-game with the new 28-year disparity), so the sine and cosine functions are based on the elapsed time since this new date. Again, I haven't performed extensive tests yet, but I assert that this is the case. I've updated the spreadsheet, and it is attached. I've updated the file format to xlsx, and updated the chart to look a little sharper.
+EP+
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Thanks for the work you put in doing this again and 'finding the Easter Egg' or however one might want to put it.