Simplify forward_day and backward_day
Simplify forward_day and backward_day

pmattern/server,pmattern/server,pollopolea/core,sharidas/core,bluelml/core,Ardinis/server,pixelipo/server,jbicha/server,jbicha/server,owncloud/core,pixelipo/server,andreas-p/nextcloud-server,IljaN/core,whitekiba/server,lrytz/core,whitekiba/server,jbicha/server,sharidas/core,pmattern/server,owncloud/core,sharidas/core,pmattern/server,bluelml/core,Ardinis/server,pollopolea/core,cernbox/core,whitekiba/server,pixelipo/server,pollopolea/core,xx621998xx/server,nextcloud/server,bluelml/core,andreas-p/nextcloud-server,xx621998xx/server,xx621998xx/server,lrytz/core,pollopolea/core,cernbox/core,bluelml/core,michaelletzgus/nextcloud-server,xx621998xx/server,sharidas/core,michaelletzgus/nextcloud-server,IljaN/core,endsguy/server,nextcloud/server,Ardinis/server,bluelml/core,pixelipo/server,lrytz/core,endsguy/server,IljaN/core,andreas-p/nextcloud-server,nextcloud/server,michaelletzgus/nextcloud-server,owncloud/core,whitekiba/server,cernbox/core,sharidas/core,Ardinis/server,cernbox/core,jbicha/server,phil-davis/core,michaelletzgus/nextcloud-server,Ardinis/server,owncloud/core,endsguy/server,endsguy/server,pmattern/server,nextcloud/server,andreas-p/nextcloud-server,lrytz/core,IljaN/core,endsguy/server,cernbox/core,pollopolea/core,andreas-p/nextcloud-server,whitekiba/server,lrytz/core,pixelipo/server,owncloud/core,xx621998xx/server,IljaN/core,jbicha/server