const sDate = moment(this.state.startDate,'YYYY-MM-DD').format('YYYY-MM-DD');
const eDate = moment(this.state.endDate,'YYYY-MM-DD').format('YYYY-MM-DD');

if(item.created ? item.created : 0 >= sDate|| item ? item.resolution : 0 <= eDate){

if(this.state.startDate && this.state.endDate){
  // if start date and end date is defined
} else {
  // filter all the data
}