对比俩个日期的间隔

String start_date = (String)data.get("start_date");
String end_date = (String)data.get("end_date");

Date a1 = DateUtils.parseDate(start_date,"yyyy-MM-dd");
Date b1 = DateUtils.parseDate(end_date,"yyyy-MM-dd");

long day = (b1.getTime()-a1.getTime())/(24*60*60*1000);