[kotlin] 날짜 구하기

// 날짜 구하기 - 방법.1
val cal = Calendar.getInstance()
val year = cal.get(Calendar.YEAR).toString()
val month = (cal.get(Calendar.MONTH) + 1).toString()
val day = cal.get(Calendar.DATE).toString()
Log.d(TAG, "DailyMenuActivity - onCreate is called ${year}-${month}-${day}")

// 날짜 구하기 - 방법.2
val cal = Calendar.getInstance()
cal.time = Date()
val dateFormat: DateFormat = SimpleDateFormat("yyyy-MM-dd")
Log.d(TAG, "DailyMenuActivity - onCreate is called ${dateFormat.format(cal.time)}")

// 날짜 연산
cal.add(Calendar.DATE, 1)
Log.d(TAG, "DailyMenuActivity - onCreate is called ${dateFormat.format(cal.time)}")

// 요일 구하기