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如题,根据时间戳怎么判断是不是昨天呢?
业精于勤,荒于嬉;行成于思,毁于随。
JDK 内置方式
public static boolean isYesterday(long timestamp) { Calendar c = Calendar.getInstance(); clearCalendar(c, Calendar.HOUR_OF_DAY, Calendar.MINUTE, Calendar.SECOND, Calendar.MILLISECOND); c.add(Calendar.DAY_OF_MONTH, -1); long firstOfDay = c.getTimeInMillis(); // 昨天最早时间 c.setTimeInMillis(timestamp); clearCalendar(c, Calendar.HOUR_OF_DAY, Calendar.MINUTE, Calendar.SECOND, Calendar.MILLISECOND); // 指定时间戳当天最早时间 return firstOfDay == c.getTimeInMillis(); } private static void clearCalendar(Calendar c, int... fields) { for (int f : fields) { c.set(f, 0); } }
( ( timestamp - System.currentTimeMillis() ) / (3600 * 24) ) == -1
public boolean isYesterday(long time) { boolean isYesterday = false; Date date; try { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); date = sdf.parse(sdf.format(new Date())); if (time < date.getTime() && time > (date.getTime() - 24*60*60*1000)) { isYesterday = true; } } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } return isYesterday; }
JDK 内置方式