Migrate content based on publish date content i use d2d migrate module to migrate content between D6 and D7 websites.Actually my migration class do partially the job for all content of a type (some issue on mapping custom fields), but i would to add an argument about specifying to migrate content publish after a specific date, this to add content to current website, or ask to migrate to ignore content created yet on system..how can i do this ?

thanks
Have you had a look at the "Highwater mark" part of the migration documentation? this may be what you are looking for.
http://drupal.org/node/1223936