diff --git a/README.md b/README.md
index 69014a5a..fa5defbe 100644
--- a/README.md
+++ b/README.md
@@ -7,15 +7,51 @@
 
 GeoNature Android mobile application for Occtax module.
 
+## Settings
+
+Example:
+
+```json
+{
+  "area_observation_duration": 365,
+  "map": {
+    "show_scale": true,
+    "show_compass": true,
+    "max_bounds": [
+      [47.253369, -1.605721],
+      [47.173845, -1.482811]
+    ],
+    "center": [47.225827, -1.55447],
+    "start_zoom": 10.0,
+    "min_zoom": 8.0,
+    "max_zoom": 19.0,
+    "min_zoom_editing": 12.0,
+    "layers": [
+      {
+        "label": "Nantes",
+        "source": "nantes.mbtiles"
+      }
+    ]
+  }
+}
+```
+
+### Parameters description
+
+| Parameter                   | UI      | Description                                                                    | Default value |
+| --------------------------- | ------- | ------------------------------------------------------------------------------ | ------------- |
+| `area_observation_duration` | ☐ | Area observation duration period (in days)                                     | 365           |
+| `map`                       | ☐ | Maps settings (cf. https://github.com/PnX-SI/gn_mobile_maps/tree/develop/maps) |               |
+
 ## Upgrade git sub modules
 
 Do **NOT** modify directly any git sub modules (e.g. `commons`, `mountpoint`, `viewpager` and `maps`).
 Any changes should be made from each underlying git repository:
 
-* `commons`: [gn_mobile_core](https://github.com/PnX-SI/gn_mobile_core) git repository
-* `mountpoint`: [gn_mobile_core](https://github.com/PnX-SI/gn_mobile_core) git repository
-* `viewpager`: [gn_mobile_core](https://github.com/PnX-SI/gn_mobile_core) git repository
-* `maps`: [gn_mobile_maps](https://github.com/PnX-SI/gn_mobile_maps) git repository
+- `commons`: [gn_mobile_core](https://github.com/PnX-SI/gn_mobile_core) git repository
+- `mountpoint`: [gn_mobile_core](https://github.com/PnX-SI/gn_mobile_core) git repository
+- `viewpager`: [gn_mobile_core](https://github.com/PnX-SI/gn_mobile_core) git repository
+- `maps`: [gn_mobile_maps](https://github.com/PnX-SI/gn_mobile_maps) git repository
 
 ```bash
 ./upgrade_submodules.sh
@@ -23,9 +59,9 @@ Any changes should be made from each underlying git repository:
 
 ## Troubleshooting
 
-* Kotlin error, Redeclaration from class within imported module:
+- Kotlin error, Redeclaration from class within imported module:
 
-  clean project from menu *Build -> Clean Project*, then rebuild project.
+  clean project from menu _Build -> Clean Project_, then rebuild project.
 
 ## Full Build
 
diff --git a/occtax/build.gradle b/occtax/build.gradle
index e6acaca5..42b0e304 100644
--- a/occtax/build.gradle
+++ b/occtax/build.gradle
@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 
-version = "0.3.3"
+version = "0.3.4"
 
 android {
     compileSdkVersion 29
diff --git a/occtax/src/main/java/fr/geonature/occtax/settings/AppSettings.kt b/occtax/src/main/java/fr/geonature/occtax/settings/AppSettings.kt
index 79b04af0..e81cdbe7 100644
--- a/occtax/src/main/java/fr/geonature/occtax/settings/AppSettings.kt
+++ b/occtax/src/main/java/fr/geonature/occtax/settings/AppSettings.kt
@@ -10,9 +10,15 @@ import fr.geonature.maps.settings.MapSettings
  *
  * @author [S. Grimault](mailto:sebastien.grimault@gmail.com)
  */
-data class AppSettings(var mapSettings: MapSettings? = null) : IAppSettings {
+data class AppSettings(
+    var areaObservationDuration: Int = DEFAULT_AREA_OBSERVATION_DURATION,
+    var mapSettings: MapSettings? = null
+) : IAppSettings {
 
-    private constructor(source: Parcel) : this(source.readParcelable(MapSettings::class.java.classLoader) as MapSettings?)
+    private constructor(source: Parcel) : this(
+        source.readInt(),
+        source.readParcelable(MapSettings::class.java.classLoader) as MapSettings?
+    )
 
     override fun describeContents(): Int {
         return 0
@@ -22,34 +28,44 @@ data class AppSettings(var mapSettings: MapSettings? = null) : IAppSettings {
         dest: Parcel?,
         flags: Int
     ) {
-        dest?.writeParcelable(
+        dest?.also {
+            it.writeInt(areaObservationDuration)
+            it.writeParcelable(
                 mapSettings,
                 0
-        )
+            )
+        }
     }
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
-        if (javaClass != other?.javaClass) return false
-
-        other as AppSettings
+        if (other !is AppSettings) return false
 
+        if (areaObservationDuration != other.areaObservationDuration) return false
         if (mapSettings != other.mapSettings) return false
 
         return true
     }
 
     override fun hashCode(): Int {
-        return mapSettings.hashCode()
+        var result = areaObservationDuration
+        result = 31 * result + (mapSettings?.hashCode() ?: 0)
+
+        return result
     }
 
-    companion object CREATOR : Parcelable.Creator<AppSettings> {
-        override fun createFromParcel(parcel: Parcel): AppSettings {
-            return AppSettings(parcel)
-        }
+    companion object {
+        const val DEFAULT_AREA_OBSERVATION_DURATION = 365
+
+        @JvmField
+        val CREATOR: Parcelable.Creator<AppSettings> = object : Parcelable.Creator<AppSettings> {
+            override fun createFromParcel(parcel: Parcel): AppSettings {
+                return AppSettings(parcel)
+            }
 
-        override fun newArray(size: Int): Array<AppSettings?> {
-            return arrayOfNulls(size)
+            override fun newArray(size: Int): Array<AppSettings?> {
+                return arrayOfNulls(size)
+            }
         }
     }
 }
diff --git a/occtax/src/main/java/fr/geonature/occtax/settings/io/OnAppSettingsJsonReaderListenerImpl.kt b/occtax/src/main/java/fr/geonature/occtax/settings/io/OnAppSettingsJsonReaderListenerImpl.kt
index 57c62de9..ce41535e 100644
--- a/occtax/src/main/java/fr/geonature/occtax/settings/io/OnAppSettingsJsonReaderListenerImpl.kt
+++ b/occtax/src/main/java/fr/geonature/occtax/settings/io/OnAppSettingsJsonReaderListenerImpl.kt
@@ -11,7 +11,8 @@ import fr.geonature.occtax.settings.AppSettings
  *
  * @author [S. Grimault](mailto:sebastien.grimault@gmail.com)
  */
-class OnAppSettingsJsonReaderListenerImpl : AppSettingsJsonReader.OnAppSettingsJsonReaderListener<AppSettings> {
+class OnAppSettingsJsonReaderListenerImpl :
+    AppSettingsJsonReader.OnAppSettingsJsonReaderListener<AppSettings> {
 
     override fun createAppSettings(): AppSettings {
         return AppSettings()
@@ -23,10 +24,13 @@ class OnAppSettingsJsonReaderListenerImpl : AppSettingsJsonReader.OnAppSettingsJ
         appSettings: AppSettings
     ) {
         when (keyName) {
+            "area_observation_duration" -> appSettings.areaObservationDuration = reader.nextInt()
             "map" -> {
                 if (reader.peek() == JsonToken.BEGIN_OBJECT) {
-                    readMapSettings(reader,
-                                    appSettings)
+                    readMapSettings(
+                        reader,
+                        appSettings
+                    )
                 } else {
                     reader.skipValue()
                 }
diff --git a/occtax/src/main/java/fr/geonature/occtax/ui/input/InputPagerFragmentActivity.kt b/occtax/src/main/java/fr/geonature/occtax/ui/input/InputPagerFragmentActivity.kt
index dc5b922f..7833b1ab 100644
--- a/occtax/src/main/java/fr/geonature/occtax/ui/input/InputPagerFragmentActivity.kt
+++ b/occtax/src/main/java/fr/geonature/occtax/ui/input/InputPagerFragmentActivity.kt
@@ -82,7 +82,7 @@ class InputPagerFragmentActivity : AbstractNavigationHistoryPagerFragmentActivit
             )
             put(
                 R.string.pager_fragment_taxa_title,
-                TaxaFragment.newInstance()
+                TaxaFragment.newInstance(appSettings.areaObservationDuration)
             )
             put(
                 R.string.pager_fragment_information_title,
diff --git a/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFilterActivity.kt b/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFilterActivity.kt
index dae47fae..0fd21bd0 100644
--- a/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFilterActivity.kt
+++ b/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFilterActivity.kt
@@ -6,6 +6,7 @@ import android.content.Intent
 import android.os.Bundle
 import android.view.MenuItem
 import androidx.appcompat.app.AppCompatActivity
+import fr.geonature.occtax.settings.AppSettings
 
 /**
  * Apply filters on taxa list.
@@ -37,7 +38,11 @@ class TaxaFilterActivity : AppCompatActivity(), TaxaFilterFragment.OnTaxaFilterF
                             EXTRA_WITH_AREA_OBSERVATION,
                             false
                         ),
-                        *selectedFilters.toTypedArray()
+                        intent.getIntExtra(
+                            EXTRA_AREA_OBSERVATION_DURATION,
+                            AppSettings.DEFAULT_AREA_OBSERVATION_DURATION
+                        ),
+                        * selectedFilters.toTypedArray()
                     )
                 )
                 .commit()
@@ -83,10 +88,12 @@ class TaxaFilterActivity : AppCompatActivity(), TaxaFilterFragment.OnTaxaFilterF
 
         const val EXTRA_SELECTED_FILTERS = "extra_selected_filters"
         const val EXTRA_WITH_AREA_OBSERVATION = "extra_with_area_observation"
+        const val EXTRA_AREA_OBSERVATION_DURATION = "extra_area_observation_duration"
 
         fun newIntent(
             context: Context,
             withAreaObservation: Boolean = false,
+            areaObservationDuration: Int = AppSettings.DEFAULT_AREA_OBSERVATION_DURATION,
             vararg filter: Filter<*>
         ): Intent {
             return Intent(
@@ -97,6 +104,10 @@ class TaxaFilterActivity : AppCompatActivity(), TaxaFilterFragment.OnTaxaFilterF
                     EXTRA_WITH_AREA_OBSERVATION,
                     withAreaObservation
                 )
+                putExtra(
+                    EXTRA_AREA_OBSERVATION_DURATION,
+                    areaObservationDuration
+                )
                 putExtra(
                     EXTRA_SELECTED_FILTERS,
                     filter
diff --git a/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFilterFragment.kt b/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFilterFragment.kt
index 208dc8d8..74b4adc7 100644
--- a/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFilterFragment.kt
+++ b/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFilterFragment.kt
@@ -18,6 +18,7 @@ import androidx.recyclerview.widget.RecyclerView
 import fr.geonature.commons.data.Taxonomy
 import fr.geonature.commons.data.helper.Provider
 import fr.geonature.occtax.R
+import fr.geonature.occtax.settings.AppSettings
 
 /**
  * [Fragment] to let the user to apply filters on taxa list.
@@ -137,8 +138,17 @@ class TaxaFilterFragment : Fragment() {
     ) {
         progressBar?.visibility = View.VISIBLE
 
-        if (arguments?.getBoolean(ARG_WITH_AREA_OBSERVATION, false) == true) {
-            loadFilterAreaObservation()
+        if (arguments?.getBoolean(
+                ARG_WITH_AREA_OBSERVATION,
+                false
+            ) == true
+        ) {
+            loadFilterAreaObservation(
+                arguments?.getInt(
+                    ARG_AREA_OBSERVATION_DURATION,
+                    AppSettings.DEFAULT_AREA_OBSERVATION_DURATION
+                ) ?: AppSettings.DEFAULT_AREA_OBSERVATION_DURATION
+            )
         }
 
         LoaderManager.getInstance(this)
@@ -165,17 +175,17 @@ class TaxaFilterFragment : Fragment() {
         listener = null
     }
 
-    private fun loadFilterAreaObservation(duration: Int = 365) {
+    private fun loadFilterAreaObservation(duration: Int) {
         val context = context ?: return
 
         val formatDuration: (Int) -> String = {
             when {
-                (it >= 365) -> context.resources.getQuantityString(
+                (it % 365 == 0) -> context.resources.getQuantityString(
                     R.plurals.duration_year,
                     (it / 365),
                     (it / 365)
                 )
-                (it >= 30) -> context.resources.getQuantityString(
+                (it % 30 == 0) -> context.resources.getQuantityString(
                     R.plurals.duration_month,
                     (it / 30),
                     (it / 30)
@@ -247,6 +257,7 @@ class TaxaFilterFragment : Fragment() {
         private val TAG = TaxaFilterFragment::class.java.name
 
         private const val ARG_WITH_AREA_OBSERVATION = "arg_with_area_observation"
+        private const val ARG_AREA_OBSERVATION_DURATION = "arg_area_observation_duration"
         private const val ARG_FILTERS = "arg_filters"
         private const val LOADER_TAXONOMY = 1
 
@@ -256,13 +267,21 @@ class TaxaFilterFragment : Fragment() {
          * @return A new instance of [TaxaFilterFragment]
          */
         @JvmStatic
-        fun newInstance(withAreaObservation: Boolean = false, vararg filter: Filter<*>) =
+        fun newInstance(
+            withAreaObservation: Boolean = false,
+            areaObservationDuration: Int = AppSettings.DEFAULT_AREA_OBSERVATION_DURATION,
+            vararg filter: Filter<*>
+        ) =
             TaxaFilterFragment().apply {
                 arguments = Bundle().apply {
                     putBoolean(
                         ARG_WITH_AREA_OBSERVATION,
                         withAreaObservation
                     )
+                    putInt(
+                        ARG_AREA_OBSERVATION_DURATION,
+                        areaObservationDuration
+                    )
                     putParcelableArray(
                         ARG_FILTERS,
                         filter
diff --git a/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFragment.kt b/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFragment.kt
index 6e76bdbc..9147f60e 100644
--- a/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFragment.kt
+++ b/occtax/src/main/java/fr/geonature/occtax/ui/input/taxa/TaxaFragment.kt
@@ -34,6 +34,7 @@ import fr.geonature.commons.util.ThemeUtils
 import fr.geonature.occtax.R
 import fr.geonature.occtax.input.Input
 import fr.geonature.occtax.input.InputTaxon
+import fr.geonature.occtax.settings.AppSettings
 import fr.geonature.occtax.ui.input.IInputFragment
 import fr.geonature.viewpager.ui.AbstractPagerFragmentActivity
 import fr.geonature.viewpager.ui.IValidateFragment
@@ -350,6 +351,10 @@ class TaxaFragment : Fragment(),
                     TaxaFilterActivity.newIntent(
                         context,
                         !savedState.getString(KEY_SELECTED_FEATURE_ID).isNullOrEmpty(),
+                        arguments?.getInt(
+                            ARG_AREA_OBSERVATION_DURATION,
+                            AppSettings.DEFAULT_AREA_OBSERVATION_DURATION
+                        ) ?: AppSettings.DEFAULT_AREA_OBSERVATION_DURATION,
                         *getSelectedFilters().toTypedArray()
                     ),
                     RESULT_FILTER
@@ -600,6 +605,7 @@ class TaxaFragment : Fragment(),
 
         private val TAG = TaxaFragment::class.java.name
 
+        private const val ARG_AREA_OBSERVATION_DURATION = "arg_area_observation_duration"
         private const val LOADER_TAXA = 1
         private const val LOADER_TAXON = 2
         private const val RESULT_FILTER = 3
@@ -614,6 +620,14 @@ class TaxaFragment : Fragment(),
          * @return A new instance of [TaxaFragment]
          */
         @JvmStatic
-        fun newInstance() = TaxaFragment()
+        fun newInstance(areaObservationDuration: Int = AppSettings.DEFAULT_AREA_OBSERVATION_DURATION) =
+            TaxaFragment().apply {
+                arguments = Bundle().apply {
+                    putInt(
+                        ARG_AREA_OBSERVATION_DURATION,
+                        areaObservationDuration
+                    )
+                }
+            }
     }
 }
diff --git a/occtax/src/test/java/fr/geonature/occtax/input/InputTest.kt b/occtax/src/test/java/fr/geonature/occtax/input/InputTest.kt
index 32f01079..eecc7740 100644
--- a/occtax/src/test/java/fr/geonature/occtax/input/InputTest.kt
+++ b/occtax/src/test/java/fr/geonature/occtax/input/InputTest.kt
@@ -3,7 +3,7 @@ package fr.geonature.occtax.input
 import android.os.Parcel
 import fr.geonature.commons.data.Taxon
 import fr.geonature.commons.data.Taxonomy
-import fr.geonature.commons.util.IsoDateUtils
+import fr.geonature.commons.util.toDate
 import java.util.Date
 import org.junit.Assert.assertEquals
 import org.junit.Test
@@ -34,7 +34,7 @@ class InputTest {
                 null,
                 133
             )
-            date = IsoDateUtils.toDate("2016-10-28") ?: Date()
+            date = toDate("2016-10-28") ?: Date()
             setPrimaryInputObserverId(1L)
             addInputObserverId(5L)
             addInputObserverId(2L)
diff --git a/occtax/src/test/java/fr/geonature/occtax/input/io/InputJsonReaderTest.kt b/occtax/src/test/java/fr/geonature/occtax/input/io/InputJsonReaderTest.kt
index 351dc0f7..81a5565e 100644
--- a/occtax/src/test/java/fr/geonature/occtax/input/io/InputJsonReaderTest.kt
+++ b/occtax/src/test/java/fr/geonature/occtax/input/io/InputJsonReaderTest.kt
@@ -4,7 +4,7 @@ import fr.geonature.commons.data.Taxon
 import fr.geonature.commons.data.Taxonomy
 import fr.geonature.commons.input.AbstractInputTaxon
 import fr.geonature.commons.input.io.InputJsonReader
-import fr.geonature.commons.util.IsoDateUtils.toDate
+import fr.geonature.commons.util.toDate
 import fr.geonature.occtax.FixtureHelper.getFixture
 import fr.geonature.occtax.input.CountingMetadata
 import fr.geonature.occtax.input.Input
diff --git a/occtax/src/test/java/fr/geonature/occtax/input/io/InputJsonWriterTest.kt b/occtax/src/test/java/fr/geonature/occtax/input/io/InputJsonWriterTest.kt
index 9b685e9f..5edffc1f 100644
--- a/occtax/src/test/java/fr/geonature/occtax/input/io/InputJsonWriterTest.kt
+++ b/occtax/src/test/java/fr/geonature/occtax/input/io/InputJsonWriterTest.kt
@@ -3,7 +3,7 @@ package fr.geonature.occtax.input.io
 import fr.geonature.commons.data.Taxon
 import fr.geonature.commons.data.Taxonomy
 import fr.geonature.commons.input.io.InputJsonWriter
-import fr.geonature.commons.util.IsoDateUtils.toDate
+import fr.geonature.commons.util.toDate
 import fr.geonature.occtax.FixtureHelper.getFixture
 import fr.geonature.occtax.input.CountingMetadata
 import fr.geonature.occtax.input.Input
diff --git a/occtax/src/test/java/fr/geonature/occtax/settings/io/AppSettingsJsonReaderTest.kt b/occtax/src/test/java/fr/geonature/occtax/settings/io/AppSettingsJsonReaderTest.kt
index a064b0e8..c13106ce 100644
--- a/occtax/src/test/java/fr/geonature/occtax/settings/io/AppSettingsJsonReaderTest.kt
+++ b/occtax/src/test/java/fr/geonature/occtax/settings/io/AppSettingsJsonReaderTest.kt
@@ -40,39 +40,41 @@ class AppSettingsJsonReaderTest {
         // then
         assertNotNull(appSettings)
         assertEquals(
-                AppSettings(
-                        MapSettings(
-                                arrayListOf(
-                                        LayerSettings(
-                                                "Nantes",
-                                                "nantes.mbtiles"
-                                        )
-                                ),
-                                null,
-                                showScale = true,
-                                showCompass = true,
-                                zoom = 10.0,
-                                minZoomLevel = 8.0,
-                                maxZoomLevel = 19.0,
-                                minZoomEditing = 12.0,
-                                maxBounds = BoundingBox.fromGeoPoints(
-                                        arrayListOf(
-                                                GeoPoint(
-                                                        47.253369,
-                                                        -1.605721
-                                                ),
-                                                GeoPoint(
-                                                        47.173845,
-                                                        -1.482811
-                                                )
-                                        )
-                                ),
-                                center = GeoPoint(
-                                        47.225827,
-                                        -1.554470
-                                )
-                        )),
-                appSettings
+            AppSettings(
+                365,
+                MapSettings(
+                    arrayListOf(
+                        LayerSettings(
+                            "Nantes",
+                            "nantes.mbtiles"
+                        )
+                    ),
+                    null,
+                    showScale = true,
+                    showCompass = true,
+                    zoom = 10.0,
+                    minZoomLevel = 8.0,
+                    maxZoomLevel = 19.0,
+                    minZoomEditing = 12.0,
+                    maxBounds = BoundingBox.fromGeoPoints(
+                        arrayListOf(
+                            GeoPoint(
+                                47.253369,
+                                -1.605721
+                            ),
+                            GeoPoint(
+                                47.173845,
+                                -1.482811
+                            )
+                        )
+                    ),
+                    center = GeoPoint(
+                        47.225827,
+                        -1.554470
+                    )
+                )
+            ),
+            appSettings
         )
     }
 
diff --git a/occtax/src/test/resources/fixtures/settings_occtax.json b/occtax/src/test/resources/fixtures/settings_occtax.json
index c9c4e8e5..88983e57 100644
--- a/occtax/src/test/resources/fixtures/settings_occtax.json
+++ b/occtax/src/test/resources/fixtures/settings_occtax.json
@@ -1,4 +1,5 @@
 {
+  "area_observation_duration": 365,
   "map": {
     "show_scale": true,
     "show_compass": true,
diff --git a/occtax/version.properties b/occtax/version.properties
index a1b7da20..8c6d67fe 100644
--- a/occtax/version.properties
+++ b/occtax/version.properties
@@ -1,2 +1,2 @@
-#Sun Jun 14 15:20:51 CEST 2020
-VERSION_CODE=1880
+#Sun Jun 21 17:06:07 CEST 2020
+VERSION_CODE=1890