On elite is says:

Start Date: 2012-03-31 1:00am, End Date: 2012-03-31 4:00am

If you scroll down a little bit more it says the normal thing about enlisting minutes before the start time but has PDT, which is the English version of BST.

Basically this means that the Clan Operations start at 1am in america and looking on Internet it starts at 8:00am in the morning in the UK.

I hope i got that right if anyone wants to elaborate on it

All I know is that the Xbox one is 11am - 2pm Aus EDST

and the PS3 one is 12pm - 3pm Aus EDST