frequency of update

How frequently does update maps from openstreetmap? Below the map image it says Slippy map and Garmin maps are based on OpenStreetMap data. Map version: 07-11-2015, is the map I downloaded really from 7-11-15?

“weekly/varies” according to this comparison chart.

I see it now says “Map version: 22-11-2015” …so yeah. That must be the date it was updated from OpenStreetMap.

Keep in mind that the date is displayed according to the Dutch formatting, so days before months ! 7-11-2015 is November 7.
This is clear from Harry’s post where 22-11-2015 wouldn’t be a valid date according to US-formatting. It means November 22, 2015