diff --git a/app/src/main/kotlin/com/simplemobiletools/clock/adapters/SelectTimeZonesAdapter.kt b/app/src/main/kotlin/com/simplemobiletools/clock/adapters/SelectTimeZonesAdapter.kt
new file mode 100644
index 00000000..809aca63
--- /dev/null
+++ b/app/src/main/kotlin/com/simplemobiletools/clock/adapters/SelectTimeZonesAdapter.kt
@@ -0,0 +1,89 @@
+package com.simplemobiletools.clock.adapters
+
+import android.support.v7.widget.RecyclerView
+import android.util.SparseArray
+import android.view.View
+import android.view.ViewGroup
+import com.simplemobiletools.clock.R
+import com.simplemobiletools.clock.activities.SimpleActivity
+import com.simplemobiletools.clock.extensions.config
+import com.simplemobiletools.clock.models.MyTimeZone
+import com.simplemobiletools.commons.extensions.getAdjustedPrimaryColor
+import com.simplemobiletools.commons.interfaces.MyAdapterListener
+import kotlinx.android.synthetic.main.item_add_time_zone.view.*
+import java.util.*
+
+class SelectTimeZonesAdapter(val activity: SimpleActivity, val timeZones: ArrayList<MyTimeZone>) : RecyclerView.Adapter<SelectTimeZonesAdapter.ViewHolder>() {
+    private val itemViews = SparseArray<View>()
+    private val selectedPositions = HashSet<Int>()
+    private val config = activity.config
+    private val textColor = config.textColor
+    private val backgroundColor = config.backgroundColor
+    private val primaryColor = activity.getAdjustedPrimaryColor()
+
+    init {
+        val selectedTimeZones = config.selectedTimeZones
+        timeZones.forEachIndexed { index, myTimeZone ->
+            if (selectedTimeZones.contains(myTimeZone.id.toString())) {
+                selectedPositions.add(index)
+            }
+        }
+    }
+
+    private fun toggleItemSelection(select: Boolean, pos: Int) {
+        if (select) {
+            if (itemViews[pos] != null) {
+                selectedPositions.add(pos)
+            }
+        } else {
+            selectedPositions.remove(pos)
+        }
+
+        itemViews[pos]?.time_zone_checkbox?.isChecked = select
+    }
+
+    private val adapterListener = object : MyAdapterListener {
+        override fun toggleItemSelectionAdapter(select: Boolean, position: Int) {
+            toggleItemSelection(select, position)
+        }
+
+        override fun getSelectedPositions() = selectedPositions
+
+        override fun itemLongClicked(position: Int) {}
+    }
+
+    fun getSelectedItemsSet(): HashSet<String> {
+        val selectedItemsSet = HashSet<String>(selectedPositions.size)
+        selectedPositions.forEach { selectedItemsSet.add(timeZones[it].id.toString()) }
+        return selectedItemsSet
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): ViewHolder {
+        val view = activity.layoutInflater.inflate(R.layout.item_add_time_zone, parent, false)
+        return ViewHolder(view, adapterListener)
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val timeZone = timeZones[position]
+        itemViews.put(position, holder.bindView(timeZone, textColor, primaryColor, backgroundColor))
+        toggleItemSelection(selectedPositions.contains(position), position)
+    }
+
+    override fun getItemCount() = timeZones.size
+
+    class ViewHolder(view: View, val adapterListener: MyAdapterListener) : RecyclerView.ViewHolder(view) {
+        fun bindView(timeZone: MyTimeZone, textColor: Int, primaryColor: Int, backgroundColor: Int): View {
+            itemView.apply {
+                time_zone_title.text = timeZone.title
+                time_zone_title.setTextColor(textColor)
+
+                time_zone_checkbox.setColors(textColor, primaryColor, backgroundColor)
+                time_zone_holder.setOnClickListener {
+                    adapterListener.toggleItemSelectionAdapter(!time_zone_checkbox.isChecked, adapterPosition)
+                }
+            }
+
+            return itemView
+        }
+    }
+}
diff --git a/app/src/main/kotlin/com/simplemobiletools/clock/dialogs/AddTimeZonesDialog.kt b/app/src/main/kotlin/com/simplemobiletools/clock/dialogs/AddTimeZonesDialog.kt
new file mode 100644
index 00000000..946b6c8c
--- /dev/null
+++ b/app/src/main/kotlin/com/simplemobiletools/clock/dialogs/AddTimeZonesDialog.kt
@@ -0,0 +1,31 @@
+package com.simplemobiletools.clock.dialogs
+
+import android.support.v7.app.AlertDialog
+import com.simplemobiletools.clock.R
+import com.simplemobiletools.clock.activities.SimpleActivity
+import com.simplemobiletools.clock.adapters.SelectTimeZonesAdapter
+import com.simplemobiletools.clock.extensions.config
+import com.simplemobiletools.clock.helpers.getAllTimeZones
+import com.simplemobiletools.commons.extensions.setupDialogStuff
+import kotlinx.android.synthetic.main.dialog_select_time_zones.view.*
+
+class AddTimeZonesDialog(val activity: SimpleActivity, private val callback: () -> Unit) {
+    private var view = activity.layoutInflater.inflate(R.layout.dialog_select_time_zones, null)
+
+    init {
+        view.select_time_zones_list.adapter = SelectTimeZonesAdapter(activity, getAllTimeZones())
+
+        AlertDialog.Builder(activity)
+                .setPositiveButton(R.string.ok, { dialog, which -> dialogConfirmed() })
+                .setNegativeButton(R.string.cancel, null)
+                .create().apply {
+            activity.setupDialogStuff(view, this)
+        }
+    }
+
+    private fun dialogConfirmed() {
+        val selectedTimeZones = (view?.select_time_zones_list?.adapter as? SelectTimeZonesAdapter)?.getSelectedItemsSet() ?: LinkedHashSet()
+        activity.config.selectedTimeZones = selectedTimeZones
+        callback()
+    }
+}
diff --git a/app/src/main/kotlin/com/simplemobiletools/clock/fragments/ClockFragment.kt b/app/src/main/kotlin/com/simplemobiletools/clock/fragments/ClockFragment.kt
index 182e0734..9ca73b53 100644
--- a/app/src/main/kotlin/com/simplemobiletools/clock/fragments/ClockFragment.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/clock/fragments/ClockFragment.kt
@@ -7,6 +7,8 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import com.simplemobiletools.clock.R
+import com.simplemobiletools.clock.activities.SimpleActivity
+import com.simplemobiletools.clock.dialogs.AddTimeZonesDialog
 import com.simplemobiletools.clock.extensions.config
 import com.simplemobiletools.commons.extensions.beVisibleIf
 import com.simplemobiletools.commons.extensions.updateTextColors
@@ -99,6 +101,8 @@ class ClockFragment : Fragment() {
     }
 
     private fun fabClicked() {
+        AddTimeZonesDialog(activity as SimpleActivity) {
 
+        }
     }
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Config.kt b/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Config.kt
index 3c587904..f92bcc9c 100644
--- a/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Config.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Config.kt
@@ -15,4 +15,8 @@ class Config(context: Context) : BaseConfig(context) {
     var displayOtherTimeZones: Boolean
         get() = prefs.getBoolean(DISPLAY_OTHER_TIME_ZONES, false)
         set(displayOtherTimeZones) = prefs.edit().putBoolean(DISPLAY_OTHER_TIME_ZONES, displayOtherTimeZones).apply()
+
+    var selectedTimeZones: Set<String>
+        get() = prefs.getStringSet(SELECTED_TIME_ZONES, HashSet())
+        set(selectedTimeZones) = prefs.edit().putStringSet(SELECTED_TIME_ZONES, selectedTimeZones).apply()
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Constants.kt b/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Constants.kt
index a75889bf..374f0fc5 100644
--- a/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Constants.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Constants.kt
@@ -5,10 +5,11 @@ import com.simplemobiletools.clock.models.MyTimeZone
 // shared preferences
 const val SHOW_SECONDS = "show_seconds"
 const val DISPLAY_OTHER_TIME_ZONES = "display_other_time_zones"
+const val SELECTED_TIME_ZONES = "selected_time_zones"
 
 const val TABS_COUNT = 3
 
-val timezones = arrayListOf(
+fun getAllTimeZones() = arrayListOf(
         MyTimeZone(1, "GMT-11:00 Midway", "Pacific/Midway"),
         MyTimeZone(2, "GMT-10:00 Honolulu", "Pacific/Honolulu"),
         MyTimeZone(3, "GMT-09:00 Anchorage", "America/Anchorage"),
diff --git a/app/src/main/res/layout/dialog_select_time_zones.xml b/app/src/main/res/layout/dialog_select_time_zones.xml
new file mode 100644
index 00000000..fbe873de
--- /dev/null
+++ b/app/src/main/res/layout/dialog_select_time_zones.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/select_time_zones_holder"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <com.simplemobiletools.commons.views.MyRecyclerView
+        android:id="@+id/select_time_zones_list"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:clipToPadding="false"
+        android:scrollbars="vertical"
+        app:layoutManager="com.simplemobiletools.commons.views.MyLinearLayoutManager"/>
+
+</RelativeLayout>
diff --git a/app/src/main/res/layout/item_add_time_zone.xml b/app/src/main/res/layout/item_add_time_zone.xml
new file mode 100644
index 00000000..5a36c52b
--- /dev/null
+++ b/app/src/main/res/layout/item_add_time_zone.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/time_zone_holder"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?attr/selectableItemBackground"
+    android:clickable="true"
+    android:focusable="true">
+
+    <com.simplemobiletools.commons.views.MyTextView
+        android:id="@+id/time_zone_title"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_toLeftOf="@+id/time_zone_checkbox"
+        android:ellipsize="end"
+        android:gravity="center_vertical"
+        android:maxLines="1"
+        android:padding="@dimen/activity_margin"
+        android:textSize="@dimen/normal_text_size"
+        tools:text="GMT-11:00 Midway"/>
+
+    <com.simplemobiletools.commons.views.MyAppCompatCheckbox
+        android:id="@+id/time_zone_checkbox"
+        android:layout_width="wrap_content"
+        android:layout_height="match_parent"
+        android:layout_alignBottom="@+id/time_zone_title"
+        android:layout_alignParentRight="true"
+        android:layout_alignTop="@+id/time_zone_title"
+        android:layout_marginRight="@dimen/activity_margin"
+        android:clickable="false"
+        android:gravity="center"/>
+
+</RelativeLayout>