When the 15% bonus is finish?

The ICO started on Monday the 22nd at 6:30am (GMT+1). That means the first week will end at Monday the 29th at 6:30AM (GMT+1).

Confirmation: http://www.timeanddate.com/date/durationresult.html?d1=22&m1=02&y1=2016&d2=29&m2=02&y2=2016&h1=6&i1=30&s1=00&h2=6&i2=30&s2=00

To get the correct time: http://wwp.greenwichmeantime.com/time-zone/gmt-plus-1

I hope that helps.