学步园

awk -v s="2013-08-19" -v t="2013-08-20" 'BEGIN{"date +%s -d "s|getline a;"date +%s -d "t|getline b;print (b/3600-a/3600)/24}'

awk 'BEGIN{"date +%s -d " "22:28:24"|getline a;"date +%s -d " "22:28:26" |getline b;print (b-a)}'