把毫秒转换成日期、天数
把一个毫秒转换成日期

private String timeToString(Long millisecond){String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Timestamp ts = new Timestamp(millisecond);str = sdf.format(ts);return str;}

private String periodToString(Long millisecond){String str = "";long day = millisecond /  86400000;long hour = (millisecond % 86400000) / 3600000 ;long minute = (millisecond %  86400000 % 3600000) / 60000;if(day > 0){str = String.valueOf(day) + "天";}if(hour > 0){str += String.valueOf(hour) + "小时";}if(minute > 0){str += String.valueOf(minute) + "分钟";}return str;}