diff --git a/app/src/main/java/com/simplemobiletools/calendar/activities/MainActivity.java b/app/src/main/java/com/simplemobiletools/calendar/activities/MainActivity.java
deleted file mode 100644
index 69c4428f7..000000000
--- a/app/src/main/java/com/simplemobiletools/calendar/activities/MainActivity.java
+++ /dev/null
@@ -1,111 +0,0 @@
-package com.simplemobiletools.calendar.activities;
-
-import android.content.Intent;
-import android.os.Bundle;
-import android.view.Menu;
-import android.view.MenuItem;
-import android.view.View;
-
-import com.simplemobiletools.calendar.Config;
-import com.simplemobiletools.calendar.Constants;
-import com.simplemobiletools.calendar.Formatter;
-import com.simplemobiletools.calendar.R;
-import com.simplemobiletools.calendar.adapters.MyPagerAdapter;
-import com.simplemobiletools.calendar.fragments.MonthFragment;
-import com.simplemobiletools.calendar.views.MyViewPager;
-
-import org.joda.time.DateTime;
-import org.joda.time.DateTimeZone;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import butterknife.BindDimen;
-import butterknife.BindView;
-import butterknife.ButterKnife;
-import butterknife.OnClick;
-
-public class MainActivity extends SimpleActivity implements MonthFragment.NavigationListener {
-    @BindView(R.id.view_pager) MyViewPager mPager;
-
-    @BindDimen(R.dimen.day_text_size) float mDayTextSize;
-    @BindDimen(R.dimen.today_text_size) float mTodayTextSize;
-
-    private static final int PREFILLED_MONTHS = 73;
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_main);
-        ButterKnife.bind(this);
-
-        final String today = new DateTime().toString(Formatter.DAYCODE_PATTERN);
-        fillViewPager(today);
-    }
-
-    @Override
-    protected void onDestroy() {
-        super.onDestroy();
-        Config.newInstance(getApplicationContext()).setIsFirstRun(false);
-    }
-
-    @Override
-    public boolean onCreateOptionsMenu(Menu menu) {
-        getMenuInflater().inflate(R.menu.menu, menu);
-        return true;
-    }
-
-    @Override
-    public boolean onOptionsItemSelected(MenuItem item) {
-        switch (item.getItemId()) {
-            case R.id.settings:
-                startActivity(new Intent(getApplicationContext(), SettingsActivity.class));
-                return true;
-            case R.id.about:
-                startActivity(new Intent(getApplicationContext(), AboutActivity.class));
-                return true;
-            default:
-                return super.onOptionsItemSelected(item);
-        }
-    }
-
-    @OnClick(R.id.calendar_fab)
-    public void fabClicked(View view) {
-        final Intent intent = new Intent(getApplicationContext(), EventActivity.class);
-        final String tomorrowCode = Formatter.getDayCodeFromDateTime(new DateTime(DateTimeZone.getDefault()).plusDays(1));
-        intent.putExtra(Constants.DAY_CODE, tomorrowCode);
-        startActivity(intent);
-    }
-
-    private void fillViewPager(String targetMonth) {
-        final List<String> codes = getMonths(targetMonth);
-        final MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager(), codes, this);
-        mPager.setAdapter(adapter);
-        mPager.setCurrentItem(codes.size() / 2);
-    }
-
-    private List<String> getMonths(String code) {
-        final List<String> months = new ArrayList<>(PREFILLED_MONTHS);
-        final DateTime today = Formatter.getDateTimeFromCode(code);
-        for (int i = -PREFILLED_MONTHS / 2; i <= PREFILLED_MONTHS / 2; i++) {
-            months.add(Formatter.getDayCodeFromDateTime(today.plusMonths(i)));
-        }
-
-        return months;
-    }
-
-    @Override
-    public void goLeft() {
-        mPager.setCurrentItem(mPager.getCurrentItem() - 1);
-    }
-
-    @Override
-    public void goRight() {
-        mPager.setCurrentItem(mPager.getCurrentItem() + 1);
-    }
-
-    @Override
-    public void goToDateTime(DateTime dateTime) {
-        fillViewPager(Formatter.getDayCodeFromDateTime(dateTime));
-    }
-}
diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/activities/MainActivity.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/activities/MainActivity.kt
new file mode 100644
index 000000000..c0845cdf5
--- /dev/null
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/activities/MainActivity.kt
@@ -0,0 +1,91 @@
+package com.simplemobiletools.calendar.activities
+
+import android.content.Intent
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import butterknife.OnClick
+import com.simplemobiletools.calendar.Config
+import com.simplemobiletools.calendar.Constants
+import com.simplemobiletools.calendar.Formatter
+import com.simplemobiletools.calendar.R
+import com.simplemobiletools.calendar.adapters.MyPagerAdapter
+import com.simplemobiletools.calendar.fragments.MonthFragment
+import kotlinx.android.synthetic.main.activity_main.*
+import org.joda.time.DateTime
+import org.joda.time.DateTimeZone
+import java.util.*
+
+class MainActivity : SimpleActivity(), MonthFragment.NavigationListener {
+    private val PREFILLED_MONTHS = 73
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        val today = DateTime().toString(Formatter.DAYCODE_PATTERN)
+        fillViewPager(today)
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        Config.newInstance(applicationContext).isFirstRun = false
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        menuInflater.inflate(R.menu.menu, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        when (item.itemId) {
+            R.id.settings -> {
+                startActivity(Intent(applicationContext, SettingsActivity::class.java))
+                return true
+            }
+            R.id.about -> {
+                startActivity(Intent(applicationContext, AboutActivity::class.java))
+                return true
+            }
+            else -> return super.onOptionsItemSelected(item)
+        }
+    }
+
+    @OnClick(R.id.calendar_fab)
+    fun fabClicked(view: View) {
+        val intent = Intent(applicationContext, EventActivity::class.java)
+        val tomorrowCode = Formatter.getDayCodeFromDateTime(DateTime(DateTimeZone.getDefault()).plusDays(1))
+        intent.putExtra(Constants.DAY_CODE, tomorrowCode)
+        startActivity(intent)
+    }
+
+    private fun fillViewPager(targetMonth: String) {
+        val codes = getMonths(targetMonth)
+        val adapter = MyPagerAdapter(supportFragmentManager, codes, this)
+        view_pager.adapter = adapter
+        view_pager.currentItem = codes.size / 2
+    }
+
+    private fun getMonths(code: String): List<String> {
+        val months = ArrayList<String>(PREFILLED_MONTHS)
+        val today = Formatter.getDateTimeFromCode(code)
+        for (i in -PREFILLED_MONTHS / 2..PREFILLED_MONTHS / 2) {
+            months.add(Formatter.getDayCodeFromDateTime(today.plusMonths(i)))
+        }
+
+        return months
+    }
+
+    override fun goLeft() {
+        view_pager.currentItem = view_pager.currentItem - 1
+    }
+
+    override fun goRight() {
+        view_pager.currentItem = view_pager.currentItem + 1
+    }
+
+    override fun goToDateTime(dateTime: DateTime) {
+        fillViewPager(Formatter.getDayCodeFromDateTime(dateTime))
+    }
+}