Fix incorrect saved tracker dates (#5581)

app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackSheet.kt

@@ -18,6 +18,7 @@ import eu.kanade.tachiyomi.source.SourceManager
 import eu.kanade.tachiyomi.ui.base.controller.openInBrowser
 import eu.kanade.tachiyomi.ui.manga.MangaController
 import eu.kanade.tachiyomi.util.lang.launchIO
+import eu.kanade.tachiyomi.util.lang.toLocalCalendar
 import eu.kanade.tachiyomi.util.lang.toUtcCalendar
 import eu.kanade.tachiyomi.util.lang.withUIContext
 import eu.kanade.tachiyomi.util.system.copyToClipboard
@@ -154,8 +155,11 @@ class TrackSheet(
             .setSelection(selection)
             .setCalendarConstraints(constraints)
             .build()
-        picker.addOnPositiveButtonClickListener {
-            controller.presenter.setTrackerStartDate(item, it)
+        picker.addOnPositiveButtonClickListener { utcMillis ->
+            val result = utcMillis.toLocalCalendar()?.timeInMillis
+            if (result != null) {
+                controller.presenter.setTrackerStartDate(item, result)
+            }
         }
         picker.show(fragmentManager, null)
     }
@@ -171,7 +175,7 @@ class TrackSheet(
         val constraints = CalendarConstraints.Builder().apply {
             val startMillis = item.track.started_reading_date.toUtcCalendar()?.timeInMillis
             if (startMillis != null) {
-                setValidator(DateValidatorPointForward.from(item.track.started_reading_date))
+                setValidator(DateValidatorPointForward.from(startMillis))
             }
         }.build()
 
@@ -180,8 +184,11 @@ class TrackSheet(
             .setSelection(selection)
             .setCalendarConstraints(constraints)
             .build()
-        picker.addOnPositiveButtonClickListener {
-            controller.presenter.setTrackerFinishDate(item, it)
+        picker.addOnPositiveButtonClickListener { utcMillis ->
+            val result = utcMillis.toLocalCalendar()?.timeInMillis
+            if (result != null) {
+                controller.presenter.setTrackerFinishDate(item, result)
+            }
         }
         picker.show(fragmentManager, null)
     }

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

@@ -46,9 +46,9 @@ fun Long.toCalendar(): Calendar? {
 }
 
 /**
- * Convert epoch long to Calendar instance in UTC
+ * Convert local time millisecond value to Calendar instance in UTC
  *
- * @return UTC Calendar instance at supplied epoch time. Null if epoch was 0.
+ * @return UTC Calendar instance at supplied time. Null if time is 0.
  */
 fun Long.toUtcCalendar(): Calendar? {
     if (this == 0L) {
@@ -69,3 +69,28 @@ fun Long.toUtcCalendar(): Calendar? {
         )
     }
 }
+
+/**
+ * Convert UTC time millisecond to Calendar instance in local time zone
+ *
+ * @return local Calendar instance at supplied UTC time. Null if time is 0.
+ */
+fun Long.toLocalCalendar(): Calendar? {
+    if (this == 0L) {
+        return null
+    }
+    val rawCalendar = Calendar.getInstance(TimeZone.getTimeZone("UTC")).apply {
+        timeInMillis = this@toLocalCalendar
+    }
+    return Calendar.getInstance().apply {
+        clear()
+        set(
+            rawCalendar.get(Calendar.YEAR),
+            rawCalendar.get(Calendar.MONTH),
+            rawCalendar.get(Calendar.DAY_OF_MONTH),
+            rawCalendar.get(Calendar.HOUR_OF_DAY),
+            rawCalendar.get(Calendar.MINUTE),
+            rawCalendar.get(Calendar.SECOND)
+        )
+    }
+}