Well, subtracted, but yeah. What I don't get is how you'd decide who got the Jersey on the third day if, for example, someone came first on the first day and second on the second day and someone else did the opposite.
In the GC I think they use the actual stage time (down to tenths/hundredths of a second) from the riders concerned rather than rounding them down and giving them the same time. whoever has the fastest time gets the jersey.
Think that makes sense