No if you write it out day by day
W1-D1, W1-D2, W1-D3, W1-D4, W1-D5, W1-D6, W1-D7
W2-D1, W2-D2, W2-D3, W2-D4, W2-D5, W2-D6, W2-D7
then count the days, you will find that week 4, day 2 is 30
Plus if you go back and check other people's scores and the number of days they have on the leaderboard, you will find that is the case.
edit - I think metro may have made a mistake on that particular one because all the other entries (well the ones I just checked) follow the example I just gave.