Minor date format code cleanup

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -22,17 +22,17 @@ fun Preference<Boolean>.invert(): Boolean = getOrDefault().let { set(!it); !it }
 
 private class DateFormatConverter : Preference.Adapter<DateFormat> {
     override fun get(key: String, preferences: SharedPreferences): DateFormat {
-        var dateFormat = preferences.getString(Keys.dateFormat, "")
+        val dateFormat = preferences.getString(Keys.dateFormat, "")!!
 
         if (dateFormat != "") {
-            return SimpleDateFormat(dateFormat)
+            return SimpleDateFormat(dateFormat, Locale.getDefault())
         }
 
         return DateFormat.getDateInstance(DateFormat.SHORT)
     }
 
     override fun set(key: String, value: DateFormat, editor: SharedPreferences.Editor) {
-        TODO("not implemented")
+        // No-op
     }
 }
 

app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoController.kt

@@ -66,7 +66,9 @@ class MangaInfoController : NucleusController<MangaInfoPresenter>(),
      */
     private val preferences: PreferencesHelper by injectLazy()
 
-    val dateFormat: DateFormat = preferences.dateFormat().getOrDefault()
+    private val dateFormat: DateFormat by lazy {
+        preferences.dateFormat().getOrDefault()
+    }
 
     init {
         setHasOptionsMenu(true)

app/src/main/java/eu/kanade/tachiyomi/ui/recently_read/RecentlyReadHolder.kt

@@ -6,8 +6,8 @@ import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.database.models.MangaChapterHistory
 import eu.kanade.tachiyomi.data.glide.GlideApp
 import eu.kanade.tachiyomi.ui.base.holder.BaseFlexibleViewHolder
+import eu.kanade.tachiyomi.util.toTimestampString
 import kotlinx.android.synthetic.main.recently_read_item.*
-import java.text.DateFormat
 import java.util.Date
 
 /**
@@ -55,10 +55,8 @@ class RecentlyReadHolder(
         manga_source.text = itemView.context.getString(R.string.recent_manga_source)
                 .format(adapter.sourceManager.getOrStub(manga.source).toString(), formattedNumber)
 
-        val date = adapter.dateFormat.format(Date(history.last_read))
-        val time = DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(history.last_read))
         // Set last read timestamp title
-        last_read.text = "$date $time"
+        last_read.text = Date(history.last_read).toTimestampString(adapter.dateFormat)
 
         // Set cover
         GlideApp.with(itemView.context).clear(cover)

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAboutController.kt

@@ -4,8 +4,8 @@ import android.app.Dialog
 import android.content.Intent
 import android.net.Uri
 import android.os.Bundle
-import androidx.preference.PreferenceScreen
 import android.view.View
+import androidx.preference.PreferenceScreen
 import com.afollestad.materialdialogs.MaterialDialog
 import eu.kanade.tachiyomi.BuildConfig
 import eu.kanade.tachiyomi.R
@@ -17,6 +17,7 @@ import eu.kanade.tachiyomi.data.updater.UpdaterJob
 import eu.kanade.tachiyomi.data.updater.UpdaterService
 import eu.kanade.tachiyomi.ui.base.controller.DialogController
 import eu.kanade.tachiyomi.ui.main.ChangelogDialogController
+import eu.kanade.tachiyomi.util.toTimestampString
 import eu.kanade.tachiyomi.util.toast
 import rx.Subscription
 import rx.android.schedulers.AndroidSchedulers
@@ -26,7 +27,8 @@ import uy.kohesive.injekt.injectLazy
 import java.text.DateFormat
 import java.text.ParseException
 import java.text.SimpleDateFormat
-import java.util.*
+import java.util.Locale
+import java.util.TimeZone
 import eu.kanade.tachiyomi.data.preference.PreferenceKeys as Keys
 
 class SettingsAboutController : SettingsController() {
@@ -36,10 +38,9 @@ class SettingsAboutController : SettingsController() {
      */
     private val updateChecker by lazy { UpdateChecker.getUpdateChecker() }
 
-
     private val userPreferences: PreferencesHelper by injectLazy()
 
-    val dateFormat: DateFormat = userPreferences.dateFormat().getOrDefault()
+    private val dateFormat: DateFormat = userPreferences.dateFormat().getOrDefault()
 
     /**
      * The subscribtion service of the obtained release object
@@ -192,9 +193,7 @@ class SettingsAboutController : SettingsController() {
                     DateFormat.MEDIUM, DateFormat.SHORT, Locale.getDefault())
             outputDf.timeZone = TimeZone.getDefault()
 
-            val date = dateFormat.format(buildTime)
-            val time = DateFormat.getTimeInstance(DateFormat.SHORT).format(buildTime)
-            return "$date $time"
+            return buildTime.toTimestampString(dateFormat)
         } catch (e: ParseException) {
             return BuildConfig.BUILD_TIME
         }

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsGeneralController.kt

@@ -18,8 +18,8 @@ class SettingsGeneralController : SettingsController() {
                     "pt-BR", "ro", "ru", "sc", "sr", "sv", "th", "tl", "tr", "uk", "vi", "zh-rCN")
             entries = entryValues.map { value ->
                 val locale = LocaleHelper.getLocaleFromString(value.toString())
-                locale?.getDisplayName(locale)?.capitalize() ?:
-                        context.getString(R.string.system_default)
+                locale?.getDisplayName(locale)?.capitalize()
+                        ?: context.getString(R.string.system_default)
             }.toTypedArray()
             defaultValue = ""
             summary = "%s"
@@ -34,9 +34,9 @@ class SettingsGeneralController : SettingsController() {
             }
         }
         listPreference {
-            key= Keys.dateFormat
+            key = Keys.dateFormat
             titleRes = R.string.pref_date_format
-            entryValues= arrayOf("", "MM/dd/yy", "dd/MM/yy", "yyyy-MM-dd")
+            entryValues = arrayOf("", "MM/dd/yy", "dd/MM/yy", "yyyy-MM-dd")
             entries = entryValues.map { value ->
                 if (value == "") {
                     context.getString(R.string.system_default)
@@ -45,7 +45,7 @@ class SettingsGeneralController : SettingsController() {
                 }
             }.toTypedArray()
             defaultValue = ""
-            summary= "%s"
+            summary = "%s"
         }
         intListPreference {
             key = Keys.theme

app/src/main/java/eu/kanade/tachiyomi/util/DateExtensions.kt

@@ -0,0 +1,10 @@
+package eu.kanade.tachiyomi.util
+
+import java.text.DateFormat
+import java.util.Date
+
+fun Date.toTimestampString(dateFormatter: DateFormat): String {
+    val date = dateFormatter.format(this)
+    val time = DateFormat.getTimeInstance(DateFormat.SHORT).format(this)
+    return "$date $time"
+}