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Date enrollDate = inter.getEnrollDate(); //可以自己创个时间节点 Date today = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); if (enrollDate != null) { String end = sdf.format(enrollDate); String time = sdf.format(today); try { enrollDate = sdf.parse(end); today = sdf.parse(time); } catch (ParseException e) { e.printStackTrace(); } } long enrollDays = (today.getTime() - enrollDate.getTime()) / (24 * 60 * 60 * 1000);