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Android Calendar 的好寫法 

val cal = Calendar.getInstance()cal.set(Calendar.YEAR, calObject.get(Calendar.YEAR))//cal.set(Calendar.DAY_OF_YEAR, 1)cal.set(Calendar.MONTH,5)cal.set(Calendar.DAY_OF_MONTH, 12)cal.set(Calendar.HOUR_OF_DAY, 0) // ! clear would not reset the hour of day !val bb = cal.time.toString()cal.clear(Calendar.MINUTE)cal.clear(Calendar.SECOND)cal.clear(Calendar.MILLISECOND)val cc = cal.timeInMillis.toString()calObject.set(Calendar.HOUR_OF_DAY, 0)calObject.clear(Calendar.MINUTE)calObject.clear(Calendar.SECOND)calObject.clear(Calendar.MILLISECOND)val dd = calObject.timeInMillis.toString()val touchTime = if (calObject.get(Calendar.HOUR_OF_DAY) >= 8) calObject.timeInMillis else calObject.timeInMillis + calObject.timeZone.rawOffset
val nowDateMills = touchTime / (3600000 * 24) * (3600000 * 24) - calObject.timeZone.rawOffset
val ee = nowDateMills.toString()//val sqlMonthBase = cal

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