В дополнение к принятому ответу

, Если Вы хотите слушать изменения времени , в то время как Ваше приложение не работает , я зарегистрировался бы в декларации:

<receiver android:name="com.your.pacakge.TimeChangeBroadcastReceiver">
    <intent-filter>
        <action android:name="android.intent.action.TIME_SET"/>
        <action android:name="android.intent.action.TIMEZONE_CHANGED"/>
    </intent-filter>
</receiver>

, Если Вы делаете это, явно не регистрируйте получатель в коде с registerReceiver и unregisterReceiver.

Снова, это - просто дополнение к принятому ответу.

Для обнаружения изменения на дате необходимо зарегистрироваться к этим действиям:

• Намерение. ACTION_TIME_CHANGED - "Время был установлен".
• Намерение. ACTION_DATE_CHANGED - "Дата изменился".
• Намерение. ACTION_TIMEZONE_CHANGED - "Часовой пояс изменился"

, Вот одно решение, которое я записал, таким образом, все, что необходимо сделать, должно расширить класс и register& нерегистр от него на Действии/Фрагменте:

abstract class DateChangedBroadcastReceiver : BroadcastReceiver() {
    private var curDate = LocalDate.now()

    /**called when the receiver detected the date has changed. You should still check it yourself, because you might already be synced with the new date*/
    abstract fun onDateChanged(previousDate: LocalDate, newDate: LocalDate)

    @Suppress("MemberVisibilityCanBePrivate")
    fun register(context: Context, date: LocalDate) {
        curDate = date
        val filter = IntentFilter()
        filter.addAction(Intent.ACTION_TIME_CHANGED)
        filter.addAction(Intent.ACTION_DATE_CHANGED)
        filter.addAction(Intent.ACTION_TIMEZONE_CHANGED)
        context.registerReceiver(this, filter)
        val newDate = LocalDate.now()
        if (newDate != curDate) {
            curDate = newDate
            onDateChanged(date, newDate)
        }
    }

    /**a convenient way to auto-unregister when activity/fragment has stopped. This should be called on the onResume method of the fragment/activity*/
    fun registerOnResume(activity: AppCompatActivity, date: LocalDate, fragment: androidx.fragment.app.Fragment? = null) {
        register(activity, date)
        val lifecycle = fragment?.lifecycle ?: activity.lifecycle
        lifecycle.addObserver(object : LifecycleObserver {
            @Suppress("unused")
            @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
            fun onPause() {
//                Log.d("AppLog", "onPause, so unregistering")
                lifecycle.removeObserver(this)
                activity.unregisterReceiver(this@DateChangedBroadcastReceiver)
            }
        })
    }

    override fun onReceive(context: Context, intent: Intent) {
        val newDate = LocalDate.now()
//        Log.d("AppLog", "got intent:" + intent.action + " curDate:" + curDate + " newDate:" + newDate)
        if (newDate != curDate) {
//            Log.d("AppLog", "cur date is different, so posting event")
            val previousDate = curDate
            curDate = newDate
            onDateChanged(previousDate, newDate)
        }
    }

}

, Если Вы не можете использовать LocalDate (поскольку он использует относительно новый API: 26, который в настоящее время используется приблизительно на 21% устройств), можно использовать это вместо этого:

abstract class DateChangedBroadcastReceiver : BroadcastReceiver() {
    private var curDate = Calendar.getInstance()

    /**called when the receiver detected the date has changed. You should still check it yourself, because you might already be synced with the new date*/
    abstract fun onDateChanged(previousDate: Calendar, newDate: Calendar)

    companion object {
        fun toString(cal: Calendar): String {
            return "${cal.get(Calendar.YEAR)}-${cal.get(Calendar.MONTH)}-${cal.get(Calendar.DAY_OF_MONTH)}"
        }

        fun resetDate(date: Calendar) {
            date.set(Calendar.HOUR_OF_DAY, 0)
            date.set(Calendar.MINUTE, 0)
            date.set(Calendar.SECOND, 0)
            date.set(Calendar.MILLISECOND, 0)
        }

        fun areOfSameDate(date: Calendar, otherDate: Calendar) =
            date.get(Calendar.DAY_OF_YEAR) == otherDate.get(Calendar.DAY_OF_YEAR) &&
                    date.get(Calendar.YEAR) == otherDate.get(Calendar.YEAR)
    }

    @Suppress("MemberVisibilityCanBePrivate")
    fun register(context: Context, date: Calendar) {
        curDate = date.clone() as Calendar
        resetDate(curDate)
        val filter = IntentFilter()
        filter.addAction(Intent.ACTION_TIME_CHANGED)
        filter.addAction(Intent.ACTION_DATE_CHANGED)
        filter.addAction(Intent.ACTION_TIMEZONE_CHANGED)
        context.registerReceiver(this, filter)
        val newDate = Calendar.getInstance()
        resetDate(newDate)
        if (!areOfSameDate(newDate, curDate)) {
            val previousDate = curDate.clone() as Calendar
            curDate = newDate
            onDateChanged(previousDate, curDate)
        }
    }

    /**a convenient way to auto-unregister when activity/fragment has stopped. This should be called on the onResume method of the fragment/activity*/
    fun registerOnResume(activity: AppCompatActivity, date: Calendar, fragment: Fragment? = null) {
        register(activity as Context, date)
        val lifecycle = fragment?.lifecycle ?: activity.lifecycle
        lifecycle.addObserver(object : LifecycleObserver {
            @Suppress("unused")
            @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
            fun onPause() {
//                Log.d("AppLog", "onPause, so unregistering")
                lifecycle.removeObserver(this)
                activity.unregisterReceiver(this@DateChangedBroadcastReceiver)
            }
        })
    }

    override fun onReceive(context: Context, intent: Intent) {
        val newDate = Calendar.getInstance()
        resetDate(newDate)
//        Log.d("AppLog", "got intent:${intent.action} curDate:${toString(curDate)} newDate:${toString(newDate)}")
        if (!areOfSameDate(newDate, curDate)) {
//            Log.d("AppLog", "cur date is different, so posting event")
            val previousDate = curDate.clone() as Calendar
            curDate = newDate
            onDateChanged(previousDate, newDate)
        }
    }

}

использование В качестве примера:

class MainActivity : AppCompatActivity() {
    var curDate = Calendar.getInstance()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }

    override fun onResume() {
        super.onResume()
        object : DateChangedBroadcastReceiver() {
            override fun onDateChanged(previousDate: Calendar, newDate: Calendar) {
                Log.d("AppLog", "MainActivity: ${DateChangedBroadcastReceiver.toString(previousDate)} -> ${DateChangedBroadcastReceiver.toString(newDate)}")
                curDate = newDate.clone() as Calendar
                //TODO handle date change
            }
        }.registerOnResume(this, curDate)
    }
}