Is Monthly evaluation on 20th or 31st?

[jenupy2j]

On the seller dashboard,
It shows :

For your next evaluation on 20 Feb, 2013 - blah blah

Then :
Low detailed seller ratings
3 months: 01 Nov, 2012 - 31 Jan, 2013

Do the figures in DSR changed on the 31st or 20th? For instance this month is it going to change to :
3 months: 01 Dec, 2012 - 31 Feb, 2013

?

[boost]

All evaluations are done on the 20th.

[Sandy D]

Then I usually see my increases hit my account around the 27-28th or so.

Have had a few show up after the first of the month.

Good luck, I hope you do well.