Today's round starts two hours later than usual, which means approximately one hour from this writing (4 p.m. London Time = 11 a.m. ET = 5 p.m. CET). Tomorrow and through round 6, play will start at the "normal" time - the same as in round 1, 2 p.m./9 a.m. ET/3 p.m. CET, and then the last round starts two hours early: noon local time/7 a.m. ET/1 p.m. CET.
This is also a useful place to mention that there will be a rest day this upcoming Monday, after round 5.