Date now = new Date();
Calendar cal1 = Calendar.getInstance();
cal1.setTime(now);
// 将时分秒,毫秒域清零
cal1.set(Calendar.HOUR_OF_DAY, 0);
cal1.set(Calendar.MINUTE, 0);
cal1.set(Calendar.SECOND, 0);
cal1.set(Calendar.MILLISECOND, 0);
Date date = cal1.getTime();
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