diff --git a/app/src/main/java/iam/thevoid/epic/timeapp/MainActivity.kt b/app/src/main/java/iam/thevoid/epic/timeapp/MainActivity.kt
index d08be6e..a58201f 100644
--- a/app/src/main/java/iam/thevoid/epic/timeapp/MainActivity.kt
+++ b/app/src/main/java/iam/thevoid/epic/timeapp/MainActivity.kt
@@ -1,10 +1,22 @@
 package iam.thevoid.epic.timeapp
 
-import androidx.appcompat.app.AppCompatActivity
+import android.annotation.SuppressLint
+import android.graphics.Color
 import android.os.Bundle
+import android.text.format.DateUtils
 import android.widget.Button
 import android.widget.EditText
 import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
+import io.reactivex.rxjava3.core.Observable
+import io.reactivex.rxjava3.disposables.Disposable
+import io.reactivex.rxjava3.schedulers.Schedulers
+import java.text.SimpleDateFormat
+import java.time.LocalTime
+import java.time.format.DateTimeFormatter
+import java.util.*
+import java.util.concurrent.TimeUnit
 
 // Дан экран с готовой разметкой
 // Реализовать при помощи RxJava
@@ -39,8 +51,120 @@ class MainActivity : AppCompatActivity() {
     // Секундомер
     private lateinit var stopwatchText: TextView
     private lateinit var stopwatchMillisText: TextView
-    private lateinit var stopwatchStartButton: EditText
-    private lateinit var stopwatchEndButton: EditText
+    private lateinit var stopwatchStartButton: Button
+    private lateinit var stopwatchEndButton: Button
+
+    enum class StopwatchState { RUN, STOP, PAUSE }
+
+    private var disposableCountdown: Disposable? = null
+    private var disposableStopwatch: Disposable? = null
+
+    private fun disposeCountdown() {
+        disposableCountdown?.dispose()
+        disposableCountdown = null
+    }
+
+    private fun disposeStopwatch() {
+        disposableStopwatch?.dispose()
+        disposableStopwatch = null
+    }
+
+    @SuppressLint("NewApi")
+    override fun onStart() {
+        super.onStart()
+
+        //1) Отображение часов
+        Observable.interval(1, TimeUnit.SECONDS)
+            .map {
+                SimpleDateFormat.getTimeInstance()
+                    .format(Calendar.getInstance().time)
+            }
+            .subscribeOn(Schedulers.io())
+            .observeOn(AndroidSchedulers.mainThread())
+            .subscribe { i -> clockText.text = i }
+
+        //2) Таймер
+        countdownStartButton.setOnClickListener {
+            disposeCountdown()
+            val countdown = countdownSecondsEditText.text.toString()
+                .toLongOrNull() ?: 0L
+            disposableCountdown = Observable.interval(1, TimeUnit.SECONDS, Schedulers.io())
+                .takeUntil { it >= countdown }
+                .map { s ->
+                    DateUtils
+                        .formatElapsedTime(countdown - s)
+                }
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(
+                    { i ->
+                        countdownText.text = i
+                        countdownText.setTextColor(Color.BLACK)
+                    },
+                    {}
+                )
+                {
+                    disposeCountdown()
+                    countdownText.setTextColor(Color.RED)
+                    countdownSecondsEditText.text = null
+                }
+        }
+
+        //3) Секундомер
+        var stopwatchState = StopwatchState.STOP
+        var milliseconds = 0L
+        stopwatchStartButton.setOnClickListener {
+            when (stopwatchState) {
+                StopwatchState.PAUSE, StopwatchState.STOP -> {
+                    stopwatchState = StopwatchState.RUN
+                    stopwatchStartButton.text = "START"
+                    stopwatchEndButton.text = "PAUSE"
+                }
+                StopwatchState.RUN -> {
+                    milliseconds = 0L
+                    disposeStopwatch()
+                }
+            }
+            //disposeStopwatch()
+            disposableStopwatch = Observable.interval(1, TimeUnit.MILLISECONDS, Schedulers.io())
+                .takeWhile { stopwatchState == StopwatchState.RUN }
+                .map { milliseconds + it }
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe {
+                    stopwatchText.text = LocalTime.ofSecondOfDay(it / 1000)
+                        .format(DateTimeFormatter.ofPattern("HH:mm:ss"))
+                    stopwatchMillisText.text = (it % 1000).toString()
+                }
+        }
+
+        stopwatchEndButton.setOnClickListener {
+            disposeStopwatch()
+            when (stopwatchState) {
+                StopwatchState.RUN -> {
+                    stopwatchState = StopwatchState.PAUSE
+                    stopwatchStartButton.text = "RUN"
+                    stopwatchEndButton.text = "STOP"
+                    milliseconds = LocalTime.parse(
+                        stopwatchText.text,
+                        DateTimeFormatter.ofPattern("HH:mm:ss")
+                    ).toSecondOfDay() * 1000L
+                }
+                StopwatchState.PAUSE -> {
+                    stopwatchState = StopwatchState.STOP
+                    milliseconds = 0L
+                    stopwatchText.setText("00:00:00")
+                    stopwatchMillisText.setText("00")
+                    stopwatchStartButton.text = "START"
+                    stopwatchEndButton.text = "PAUSE"
+                    disposeStopwatch()
+                }
+            }
+        }
+    }
+
+    override fun onStop() {
+        super.onStop()
+        disposeCountdown()
+    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -57,4 +181,9 @@ class MainActivity : AppCompatActivity() {
         stopwatchStartButton = findViewById(R.id.stopwatchStartButton)
         stopwatchEndButton = findViewById(R.id.stopwatchEndButton)
     }
-}
\ No newline at end of file
+
+    companion object {
+        private val LOG_TAG = MainActivity::class.simpleName
+    }
+
+}