count改

src/test/java/count/Count.java

@@ -21,7 +21,7 @@ public class Count {
 		try {
 			Date date1 = df.parse(beginReceiveTime);
 			Date date2 = df.parse(lastReceiveTime);
-			long diff = date1.getTime() - date2.getTime();
+			long diff = date2.getTime() - date1.getTime();
 			long minutes = diff / (1000 * 60);
 			return minutes;
 		} catch (Exception e) {