【Java开发基础】计算两个毫秒之间相差多少天

 

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private long daysBeforeExpire() {     return daysBetween(System.currentTimeMillis(), getExpireDate().getTime()); }   private long daysAfterProduce() {     return daysBetween(getProducedDate().getTime(), System.currentTimeMillis()); }     public static long daysBetween(long from, long to) {     long gap = to - from;     if (gap < 0) {         return -1;     }     return gap / (24 * 3600 * 1000); }