如何从从timepicker获取的Hours+Minutes中减去System.currentTimeMillis()？

// 获取timepicker选择的小时和分钟数
int selectedHours = timePicker.getHours();
int selectedMinutes = timePicker.getMinutes();

// 将选择的时间转换为毫秒数
long selectedMilliseconds = (selectedHours * 60 * 60 * 1000) + (selectedMinutes * 60 * 1000);

// 获取当前系统时间的毫秒数
long currentMilliseconds = System.currentTimeMillis();

// 计算时间差
long timeDifference = selectedMilliseconds - currentMilliseconds;

// 将时间差转换为小时和分钟数
int hoursDifference = (int) (timeDifference / (60 * 60 * 1000));
int minutesDifference = (int) ((timeDifference % (60 * 60 * 1000)) / (60 * 1000));

// 输出结果
System.out.println("时间差为：" + hoursDifference + "小时 " + minutesDifference + "分钟");