Date filter for Hacknight (fixes #493)#494

stanislawK wants to merge 3 commits intoCodeForPoznan:masterCodeForPoznan/codeforpoznan.pl_v3:masterfrom

stanislawK:493_hacknight_list_date_filterstanislawK/codeforpoznan.pl_v3:493_hacknight_list_date_filterCopy head branch name to clipboard