负数为当前时间往前-1为昨天的当前时间 Calendar c = Calendar.getInstance(); c.add(Calendar.DAY_OF_MONTH, -1); System.out.println(formatter.format(c.getTime())); 获取次日凌晨 Calendar calendar = Calendar.getInstance(); calendar.add(Calendar.DAY_OF_MONTH, -1); calendar.set(Calendar.HOUR_OF_DAY, 0); calendar.set(Calendar.MINUTE, 0); calendar.set(Calendar.SECOND, 0); calendar.set(Calendar.MILLISECOND, 0); System.out.println(formatter.format(calendar.getTimeInMillis())); 根据当前年月日获取是周几 SimpleDateFormat sdf = new SimpleDateFormat("EEEE"); String week = sdf.format(date);
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