When are they updating clan rank ?

Wrong.

They update the points every day, however since the patch it has been messed up. They have fixed some issues with members joining/leaving but the points system is still not showing the new amounts and so the clan rank is also fixed on an old rank.

The weekly update is only when they deduct 5% off the points.

Edit: OK, so i've read the FAQ again.

Clans are ranked by clan points, which are received by clan members who are playing online. For every 500 EXP earned by a clan member one (1) clan point is awarded to that player’s clan. Clan points can also be earned by playing and winning clan matches and through special events and promotions to be announced. At the end of each week, 5% of all clan points will be taken/removed from all clans. Clans will then be ranked according their number of remaining clan points.

and according to that the clan rank WILL be updated AFTER the 5% deduction each week?

Nice of someone to tell us this changed, so we won't all be posting there is something wrong with it???

The points are still updated every day as I can those in the points log, but the rank is based on the points from the 21st Dec. Maybe on 28th Dec the ranks will get updated?