使用a
Calendar来获取本地纪元处的偏移量，然后将其添加到本地纪元时间戳中。
public static long getLocalToUtcDelta() { Calendar local = Calendar.getInstance(); local.clear(); local.set(1970, Calendar.JANUARY, 1, 0, 0, 0); return local.getTimeInMillis();}public static long converLocalTimeToUtcTime(long timeSinceLocalEpoch) { return timeSinceLocalEpoch + getLocalToUtcDelta();}
