How many days after the signing did Díaz and Corral have to resign under the Treaty of Ciudad Juárez?
return the  signing ;return Díaz and  Corral have to resign under the  Treaty of Ciudad Juárez ;return when  was  #1 ;return when  was  #2 ;return difference of #4 and  #3 in  days
['select', 'select', 'project', 'project', 'arithmetic']