diff --git a/CHANGELOG.md b/CHANGELOG.md
index e87ad34a1..b6dfbc8b5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [2.0.3] - [Unreleased]
+### Fixed
+- Improve automatic checkmarks for monthly habits (@iSoron, 947)
+- Fix small theme issues (@iSoron)
+- Fix ANR on some Samsung phones (@iSoron, #962)
+
 ## [2.0.2] - 2021-05-23
 
 ### Changed
diff --git a/uhabits-android/build.gradle.kts b/uhabits-android/build.gradle.kts
index 6017450b5..6062a86f7 100644
--- a/uhabits-android/build.gradle.kts
+++ b/uhabits-android/build.gradle.kts
@@ -37,8 +37,8 @@ android {
     compileSdkVersion(30)
 
     defaultConfig {
-        versionCode(20002)
-        versionName("2.0.2")
+        versionCode(20003)
+        versionName("2.0.3")
         minSdkVersion(23)
         targetSdkVersion(30)
         applicationId("org.isoron.uhabits")
diff --git a/uhabits-android/src/main/java/org/isoron/platform/gui/AndroidCanvas.kt b/uhabits-android/src/main/java/org/isoron/platform/gui/AndroidCanvas.kt
index b4ff1d5e5..ae1d1f52f 100644
--- a/uhabits-android/src/main/java/org/isoron/platform/gui/AndroidCanvas.kt
+++ b/uhabits-android/src/main/java/org/isoron/platform/gui/AndroidCanvas.kt
@@ -36,6 +36,7 @@ class AndroidCanvas : Canvas {
     var innerDensity = 1.0
     var innerWidth = 0
     var innerHeight = 0
+    var mHeight = 15
 
     var paint = Paint().apply {
         isAntiAlias = true
@@ -64,11 +65,10 @@ class AndroidCanvas : Canvas {
     }
 
     override fun drawText(text: String, x: Double, y: Double) {
-        textPaint.getTextBounds(text, 0, text.length, textBounds)
         innerCanvas.drawText(
             text,
             x.toDp(),
-            y.toDp() - textBounds.exactCenterY(),
+            y.toDp() + 0.6f * mHeight,
             textPaint,
         )
     }
@@ -126,10 +126,17 @@ class AndroidCanvas : Canvas {
             Font.BOLD -> Typeface.DEFAULT_BOLD
             Font.FONT_AWESOME -> getFontAwesome(context)
         }
+        updateMHeight()
     }
 
     override fun setFontSize(size: Double) {
         textPaint.textSize = size.toDp()
+        updateMHeight()
+    }
+
+    private fun updateMHeight() {
+        textPaint.getTextBounds("m", 0, 1, textBounds)
+        mHeight = textBounds.height()
     }
 
     override fun setStrokeWidth(size: Double) {
diff --git a/uhabits-android/src/main/java/org/isoron/uhabits/activities/AndroidThemeSwitcher.kt b/uhabits-android/src/main/java/org/isoron/uhabits/activities/AndroidThemeSwitcher.kt
index 855adaa84..be9d0eb02 100644
--- a/uhabits-android/src/main/java/org/isoron/uhabits/activities/AndroidThemeSwitcher.kt
+++ b/uhabits-android/src/main/java/org/isoron/uhabits/activities/AndroidThemeSwitcher.kt
@@ -30,6 +30,7 @@ import org.isoron.uhabits.core.preferences.Preferences
 import org.isoron.uhabits.core.ui.ThemeSwitcher
 import org.isoron.uhabits.core.ui.views.DarkTheme
 import org.isoron.uhabits.core.ui.views.LightTheme
+import org.isoron.uhabits.core.ui.views.PureBlackTheme
 import org.isoron.uhabits.core.ui.views.Theme
 import org.isoron.uhabits.inject.ActivityContext
 import org.isoron.uhabits.inject.ActivityScope
@@ -66,7 +67,7 @@ constructor(
     }
 
     override fun applyPureBlackTheme() {
-        currentTheme = DarkTheme()
+        currentTheme = PureBlackTheme()
         context.setTheme(R.style.AppBaseThemeDark_PureBlack)
         (context as Activity).window.navigationBarColor =
             ContextCompat.getColor(context, R.color.black)
diff --git a/uhabits-android/src/main/java/org/isoron/uhabits/activities/common/dialogs/FrequencyPickerDialog.kt b/uhabits-android/src/main/java/org/isoron/uhabits/activities/common/dialogs/FrequencyPickerDialog.kt
index 0971ffab6..92754ca89 100644
--- a/uhabits-android/src/main/java/org/isoron/uhabits/activities/common/dialogs/FrequencyPickerDialog.kt
+++ b/uhabits-android/src/main/java/org/isoron/uhabits/activities/common/dialogs/FrequencyPickerDialog.kt
@@ -160,26 +160,28 @@ class FrequencyPickerDialog(
 
     private fun populateViews() {
         uncheckAll()
-        if (freqNumerator == 1) {
-            if (freqDenominator == 1) {
-                contentView.everyDayRadioButton.isChecked = true
-            } else {
-                contentView.everyXDaysRadioButton.isChecked = true
-                contentView.everyXDaysTextView.setText(freqDenominator.toString())
-                focus(contentView.everyXDaysTextView)
-            }
+        if (freqDenominator == 30 || freqDenominator == 31) {
+            contentView.xTimesPerMonthRadioButton.isChecked = true
+            contentView.xTimesPerMonthTextView.setText(freqNumerator.toString())
+            focus(contentView.xTimesPerMonthTextView)
         } else {
-            if (freqDenominator == 7) {
-                contentView.xTimesPerWeekRadioButton.isChecked = true
-                contentView.xTimesPerWeekTextView.setText(freqNumerator.toString())
-                focus(contentView.xTimesPerWeekTextView)
-            } else if (freqDenominator == 30 || freqDenominator == 31) {
-                contentView.xTimesPerMonthRadioButton.isChecked = true
-                contentView.xTimesPerMonthTextView.setText(freqNumerator.toString())
-                focus(contentView.xTimesPerMonthTextView)
+            if (freqNumerator == 1) {
+                if (freqDenominator == 1) {
+                    contentView.everyDayRadioButton.isChecked = true
+                } else {
+                    contentView.everyXDaysRadioButton.isChecked = true
+                    contentView.everyXDaysTextView.setText(freqDenominator.toString())
+                    focus(contentView.everyXDaysTextView)
+                }
             } else {
-                Log.w("FrequencyPickerDialog", "Unknown frequency: $freqNumerator/$freqDenominator")
-                contentView.everyDayRadioButton.isChecked = true
+                if (freqDenominator == 7) {
+                    contentView.xTimesPerWeekRadioButton.isChecked = true
+                    contentView.xTimesPerWeekTextView.setText(freqNumerator.toString())
+                    focus(contentView.xTimesPerWeekTextView)
+                } else {
+                    Log.w("FrequencyPickerDialog", "Unknown frequency: $freqNumerator/$freqDenominator")
+                    contentView.everyDayRadioButton.isChecked = true
+                }
             }
         }
     }
diff --git a/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/edit/EditHabitActivity.kt b/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/edit/EditHabitActivity.kt
index 289caa867..c5e432b1f 100644
--- a/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/edit/EditHabitActivity.kt
+++ b/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/edit/EditHabitActivity.kt
@@ -21,6 +21,7 @@ package org.isoron.uhabits.activities.habits.edit
 
 import android.annotation.SuppressLint
 import android.content.res.ColorStateList
+import android.content.res.Resources
 import android.graphics.Color
 import android.os.Bundle
 import android.text.Html
@@ -59,6 +60,16 @@ import org.isoron.uhabits.utils.formatTime
 import org.isoron.uhabits.utils.toFormattedString
 import org.isoron.uhabits.utils.toThemedAndroidColor
 
+fun formatFrequency(freqNum: Int, freqDen: Int, resources: Resources) = when {
+    freqNum == 1 && (freqDen == 30 || freqDen == 31) -> resources.getString(R.string.every_month)
+    freqDen == 30 || freqDen == 31 -> resources.getString(R.string.x_times_per_month, freqNum)
+    freqNum == 1 && freqDen == 1 -> resources.getString(R.string.every_day)
+    freqNum == 1 && freqDen == 7 -> resources.getString(R.string.every_week)
+    freqNum == 1 && freqDen > 1 -> resources.getString(R.string.every_x_days, freqDen)
+    freqDen == 7 -> resources.getString(R.string.x_times_per_week, freqNum)
+    else -> "$freqNum/$freqDen"
+}
+
 class EditHabitActivity : AppCompatActivity() {
 
     private lateinit var themeSwitcher: AndroidThemeSwitcher
@@ -299,14 +310,7 @@ class EditHabitActivity : AppCompatActivity() {
 
     @SuppressLint("StringFormatMatches")
     private fun populateFrequency() {
-        binding.booleanFrequencyPicker.text = when {
-            freqNum == 1 && freqDen == 1 -> getString(R.string.every_day)
-            freqNum == 1 && freqDen == 7 -> getString(R.string.every_week)
-            freqNum == 1 && freqDen > 1 -> getString(R.string.every_x_days, freqDen)
-            freqDen == 7 -> getString(R.string.x_times_per_week, freqNum)
-            freqDen == 30 || freqDen == 31 -> getString(R.string.x_times_per_month, freqNum)
-            else -> "$freqNum/$freqDen"
-        }
+        binding.booleanFrequencyPicker.text = formatFrequency(freqNum, freqDen, resources)
         binding.numericalFrequencyPicker.text = when (freqDen) {
             1 -> getString(R.string.every_day)
             7 -> getString(R.string.every_week)
diff --git a/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/views/SubtitleCardView.kt b/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/views/SubtitleCardView.kt
index 7b0cc407b..0673017e8 100644
--- a/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/views/SubtitleCardView.kt
+++ b/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/views/SubtitleCardView.kt
@@ -20,14 +20,13 @@ package org.isoron.uhabits.activities.habits.show.views
 
 import android.annotation.SuppressLint
 import android.content.Context
-import android.content.res.Resources
 import android.util.AttributeSet
 import android.view.LayoutInflater
 import android.view.View
 import android.widget.LinearLayout
 import org.isoron.uhabits.R
+import org.isoron.uhabits.activities.habits.edit.formatFrequency
 import org.isoron.uhabits.activities.habits.list.views.toShortString
-import org.isoron.uhabits.core.models.Frequency
 import org.isoron.uhabits.core.ui.screens.habits.show.views.SubtitleCardState
 import org.isoron.uhabits.databinding.ShowHabitSubtitleBinding
 import org.isoron.uhabits.utils.InterfaceUtils
@@ -49,7 +48,11 @@ class SubtitleCardView(context: Context, attrs: AttributeSet) : LinearLayout(con
     fun setState(state: SubtitleCardState) {
         val color = state.color.toThemedAndroidColor(context)
         val reminder = state.reminder
-        binding.frequencyLabel.text = state.frequency.format(resources)
+        binding.frequencyLabel.text = formatFrequency(
+            state.frequency.numerator,
+            state.frequency.denominator,
+            resources,
+        )
         binding.questionLabel.setTextColor(color)
         binding.questionLabel.text = state.question
         binding.reminderLabel.text = if (reminder != null) {
@@ -72,32 +75,4 @@ class SubtitleCardView(context: Context, attrs: AttributeSet) : LinearLayout(con
 
         postInvalidate()
     }
-
-    @SuppressLint("StringFormatMatches")
-    private fun Frequency.format(resources: Resources): String {
-        val num = this.numerator
-        val den = this.denominator
-        if (num == den) {
-            return resources.getString(R.string.every_day)
-        }
-        if (den == 7) {
-            return resources.getString(R.string.x_times_per_week, num)
-        }
-        if (den == 30 || den == 31) {
-            return resources.getString(R.string.x_times_per_month, num)
-        }
-        if (num == 1) {
-            if (den == 7) {
-                return resources.getString(R.string.every_week)
-            }
-            if (den % 7 == 0) {
-                return resources.getString(R.string.every_x_weeks, den / 7)
-            }
-            if (den == 30 || den == 31) {
-                return resources.getString(R.string.every_month)
-            }
-            return resources.getString(R.string.every_x_days, den)
-        }
-        return "$num/$den"
-    }
 }
diff --git a/uhabits-android/src/main/java/org/isoron/uhabits/intents/PendingIntentFactory.kt b/uhabits-android/src/main/java/org/isoron/uhabits/intents/PendingIntentFactory.kt
index 7ec0b8485..5df329a95 100644
--- a/uhabits-android/src/main/java/org/isoron/uhabits/intents/PendingIntentFactory.kt
+++ b/uhabits-android/src/main/java/org/isoron/uhabits/intents/PendingIntentFactory.kt
@@ -63,13 +63,14 @@ class PendingIntentFactory
             FLAG_UPDATE_CURRENT
         )
 
-    fun removeRepetition(habit: Habit): PendingIntent =
+    fun removeRepetition(habit: Habit, timestamp: Timestamp?): PendingIntent =
         getBroadcast(
             context,
             3,
             Intent(context, WidgetReceiver::class.java).apply {
                 action = WidgetReceiver.ACTION_REMOVE_REPETITION
                 data = Uri.parse(habit.uriString)
+                if (timestamp != null) putExtra("timestamp", timestamp.unixTime)
             },
             FLAG_UPDATE_CURRENT
         )
diff --git a/uhabits-android/src/main/java/org/isoron/uhabits/notifications/AndroidNotificationTray.kt b/uhabits-android/src/main/java/org/isoron/uhabits/notifications/AndroidNotificationTray.kt
index de1c23d24..04f3d8d92 100644
--- a/uhabits-android/src/main/java/org/isoron/uhabits/notifications/AndroidNotificationTray.kt
+++ b/uhabits-android/src/main/java/org/isoron/uhabits/notifications/AndroidNotificationTray.kt
@@ -107,7 +107,7 @@ class AndroidNotificationTray
         val removeRepetitionAction = Action(
             R.drawable.ic_action_cancel,
             context.getString(R.string.no),
-            pendingIntents.removeRepetition(habit)
+            pendingIntents.removeRepetition(habit, timestamp)
         )
 
         val enterAction = Action(
diff --git a/uhabits-android/src/main/java/org/isoron/uhabits/widgets/activities/HabitPickerDialog.kt b/uhabits-android/src/main/java/org/isoron/uhabits/widgets/activities/HabitPickerDialog.kt
index 2383b3683..ff743816b 100644
--- a/uhabits-android/src/main/java/org/isoron/uhabits/widgets/activities/HabitPickerDialog.kt
+++ b/uhabits-android/src/main/java/org/isoron/uhabits/widgets/activities/HabitPickerDialog.kt
@@ -31,6 +31,7 @@ import android.widget.ListView
 import android.widget.TextView
 import org.isoron.uhabits.HabitsApplication
 import org.isoron.uhabits.R
+import org.isoron.uhabits.activities.AndroidThemeSwitcher
 import org.isoron.uhabits.core.preferences.WidgetPreferences
 import org.isoron.uhabits.widgets.WidgetUpdater
 import java.util.ArrayList
@@ -58,6 +59,7 @@ open class HabitPickerDialog : Activity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         val component = (applicationContext as HabitsApplication).component
+        AndroidThemeSwitcher(this, component.preferences).apply()
         val habitList = component.habitList
         widgetPreferences = component.widgetPreferences
         widgetUpdater = component.widgetUpdater
diff --git a/uhabits-android/src/main/res/values/styles.xml b/uhabits-android/src/main/res/values/styles.xml
index 2f8eb6e21..9bba46775 100644
--- a/uhabits-android/src/main/res/values/styles.xml
+++ b/uhabits-android/src/main/res/values/styles.xml
@@ -129,6 +129,7 @@
         <item name="selectedBackground">@drawable/selected_box</item>
         <item name="textColorAlertDialogListItem">@color/grey_100</item>
         <item name="windowBackgroundColor">@color/black</item>
+        <item name="preferenceTheme">@style/PreferenceThemeOverlay.v14.Material.PureBlack</item>
     </style>
 
     <style name="BaseDialog" parent="Theme.AppCompat.Light.Dialog">
@@ -151,6 +152,11 @@
         <item name="palette">@array/darkPalette</item>
     </style>
 
+    <style name="PreferenceThemeOverlay.v14.Material.PureBlack">
+        <item name="android:background">@color/black</item>
+    </style>
+
+
     <style name="WidgetTheme" parent="AppBaseThemeDark">
         <item name="cardBgColor">@color/grey_850</item>
         <item name="contrast0">@color/white</item>
diff --git a/uhabits-core/src/commonMain/kotlin/org/isoron/platform/time/Dates.kt b/uhabits-core/src/commonMain/kotlin/org/isoron/platform/time/Dates.kt
index 5d440be90..8a528d08b 100644
--- a/uhabits-core/src/commonMain/kotlin/org/isoron/platform/time/Dates.kt
+++ b/uhabits-core/src/commonMain/kotlin/org/isoron/platform/time/Dates.kt
@@ -72,10 +72,20 @@ data class LocalDate(val daysSince2000: Int) {
             return dayCache
         }
 
+    val monthLength: Int
+        get() = when (month) {
+            4, 6, 9, 11 -> 30
+            2 -> if (isLeapYear(year)) 29 else 28
+            else -> 31
+        }
+
     private fun updateYearMonthDayCache() {
         var currYear = 2000
         var currDay = 0
-
+        if (daysSince2000 < 0) {
+            currYear -= 400
+            currDay -= 146097
+        }
         while (true) {
             val currYearLength = if (isLeapYear(currYear)) 366 else 365
             if (daysSince2000 < currDay + currYearLength) {
@@ -86,10 +96,8 @@ data class LocalDate(val daysSince2000: Int) {
                 currDay += currYearLength
             }
         }
-
         var currMonth = 1
         val monthOffset = if (isLeapYear(currYear)) leapOffset else nonLeapOffset
-
         while (true) {
             if (daysSince2000 < currDay + monthOffset[currMonth]) {
                 monthCache = currMonth
@@ -98,7 +106,6 @@ data class LocalDate(val daysSince2000: Int) {
                 currMonth++
             }
         }
-
         currDay += monthOffset[currMonth - 1]
         dayCache = daysSince2000 - currDay + 1
     }
diff --git a/uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/models/EntryList.kt b/uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/models/EntryList.kt
index 76a2fabf8..b11baea24 100644
--- a/uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/models/EntryList.kt
+++ b/uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/models/EntryList.kt
@@ -248,8 +248,17 @@ open class EntryList {
             for (i in num - 1 until filtered.size) {
                 val (begin, _) = filtered[i]
                 val (center, _) = filtered[i - num + 1]
-                if (begin.daysUntil(center) < den) {
-                    val end = begin.plus(den - 1)
+                var size = den
+                if (den == 30 || den == 31) {
+                    val beginDate = begin.toLocalDate()
+                    size = if (beginDate.day == beginDate.monthLength) {
+                        beginDate.plus(1).monthLength
+                    } else {
+                        beginDate.monthLength
+                    }
+                }
+                if (begin.daysUntil(center) < size) {
+                    val end = begin.plus(size - 1)
                     intervals.add(Interval(begin, center, end))
                 }
             }
diff --git a/uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/ui/views/Themes.kt b/uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/ui/views/Themes.kt
index a7ab62ba6..7f43541f7 100644
--- a/uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/ui/views/Themes.kt
+++ b/uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/ui/views/Themes.kt
@@ -109,6 +109,12 @@ open class DarkTheme : Theme() {
     }
 }
 
+class PureBlackTheme : DarkTheme() {
+    override val appBackgroundColor = Color(0x000000)
+    override val cardBackgroundColor = Color(0x000000)
+    override val lowContrastTextColor = Color(0x212121)
+}
+
 class WidgetTheme : LightTheme() {
     override val cardBackgroundColor = Color.TRANSPARENT
     override val highContrastTextColor = Color.WHITE
diff --git a/uhabits-core/src/jvmTest/java/org/isoron/platform/gui/DatesTest.kt b/uhabits-core/src/jvmTest/java/org/isoron/platform/gui/DatesTest.kt
new file mode 100644
index 000000000..47329ebc2
--- /dev/null
+++ b/uhabits-core/src/jvmTest/java/org/isoron/platform/gui/DatesTest.kt
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2016-2021 Álinson Santos Xavier <git@axavier.org>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.isoron.platform.gui
+
+import org.isoron.platform.time.LocalDate
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class DatesTest {
+    @Test
+    fun testDatesBefore2000() {
+        val date = LocalDate(-1)
+        assertEquals(date.day, 31)
+        assertEquals(date.month, 12)
+        assertEquals(date.year, 1999)
+    }
+}