fix: preserve current day on rotation

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Preserve current day when changing orientation ([#1042])
 
 ## [1.10.3] - 2026-02-14
 ### Changed
@@ -237,6 +239,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#1003]: https://github.com/FossifyOrg/Calendar/issues/1003
 [#1019]: https://github.com/FossifyOrg/Calendar/issues/1019
 [#1024]: https://github.com/FossifyOrg/Calendar/issues/1024
+[#1042]: https://github.com/FossifyOrg/Calendar/issues/1042
 
 [Unreleased]: https://github.com/FossifyOrg/Calendar/compare/1.10.3...HEAD
 [1.10.3]: https://github.com/FossifyOrg/Calendar/compare/1.10.2...1.10.3

app/src/main/kotlin/org/fossify/calendar/fragments/DayFragmentsHolder.kt

@@ -34,6 +34,9 @@ class DayFragmentsHolder : MyFragmentHolder(), NavigationListener {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         currentDayCode = arguments?.getString(DAY_CODE) ?: ""
+        if (savedInstanceState != null) {
+            currentDayCode = savedInstanceState.getString(::currentDayCode.name) ?: currentDayCode
+        }
         todayDayCode = Formatter.getTodayCode()
     }
 
@@ -46,6 +49,11 @@ class DayFragmentsHolder : MyFragmentHolder(), NavigationListener {
         return binding.root
     }
 
+    override fun onSaveInstanceState(outState: Bundle) {
+        outState.putString(::currentDayCode.name, currentDayCode)
+        super.onSaveInstanceState(outState)
+    }
+
     private fun setupFragment() {
         val codes = getDays(currentDayCode)
         val dailyAdapter = MyDayPagerAdapter(requireActivity().supportFragmentManager, codes, this)

app/src/main/kotlin/org/fossify/calendar/fragments/MonthDayFragmentsHolder.kt

@@ -37,6 +37,9 @@ class MonthDayFragmentsHolder : MyFragmentHolder(), NavigationListener {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         currentDayCode = arguments?.getString(DAY_CODE) ?: ""
+        if (savedInstanceState != null) {
+            currentDayCode = savedInstanceState.getString(::currentDayCode.name) ?: currentDayCode
+        }
         todayDayCode = Formatter.getTodayCode()
     }
 
@@ -49,6 +52,11 @@ class MonthDayFragmentsHolder : MyFragmentHolder(), NavigationListener {
         return binding.root
     }
 
+    override fun onSaveInstanceState(outState: Bundle) {
+        outState.putString(::currentDayCode.name, currentDayCode)
+        super.onSaveInstanceState(outState)
+    }
+
     private fun setupFragment() {
         val codes = getMonths(currentDayCode)
         val monthlyDailyAdapter = MyMonthDayPagerAdapter(requireActivity().supportFragmentManager, codes, this)

app/src/main/kotlin/org/fossify/calendar/fragments/MonthFragmentsHolder.kt

@@ -37,6 +37,9 @@ class MonthFragmentsHolder : MyFragmentHolder(), NavigationListener {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         currentDayCode = arguments?.getString(DAY_CODE) ?: ""
+        if (savedInstanceState != null) {
+            currentDayCode = savedInstanceState.getString(::currentDayCode.name) ?: currentDayCode
+        }
         todayDayCode = Formatter.getTodayCode()
     }
 
@@ -49,6 +52,11 @@ class MonthFragmentsHolder : MyFragmentHolder(), NavigationListener {
         return binding.root
     }
 
+    override fun onSaveInstanceState(outState: Bundle) {
+        outState.putString(::currentDayCode.name, currentDayCode)
+        super.onSaveInstanceState(outState)
+    }
+
     private fun setupFragment() {
         val codes = getMonths(currentDayCode)
         val monthlyAdapter = MyMonthPagerAdapter(requireActivity().supportFragmentManager, codes, this)

app/src/main/kotlin/org/fossify/calendar/fragments/WeekFragmentsHolder.kt

@@ -44,6 +44,9 @@ class WeekFragmentsHolder : MyFragmentHolder(), WeekFragmentListener {
         super.onCreate(savedInstanceState)
         val dateTimeString = arguments?.getString(WEEK_START_DATE_TIME) ?: return
         currentWeekTS = (DateTime.parse(dateTimeString) ?: DateTime()).seconds()
+        if (savedInstanceState != null) {
+            currentWeekTS = savedInstanceState.getLong(::currentWeekTS.name)
+        }
         updateThisWeekTS()
     }
 
@@ -72,6 +75,11 @@ class WeekFragmentsHolder : MyFragmentHolder(), WeekFragmentListener {
         setupSeekbar()
     }
 
+    override fun onSaveInstanceState(outState: Bundle) {
+        outState.putLong(::currentWeekTS.name, currentWeekTS)
+        super.onSaveInstanceState(outState)
+    }
+
     private fun setupFragment() {
         addHours()
         setupWeeklyViewPager()

app/src/main/kotlin/org/fossify/calendar/fragments/YearFragmentsHolder.kt

@@ -37,6 +37,9 @@ class YearFragmentsHolder : MyFragmentHolder(), NavigationListener {
         super.onCreate(savedInstanceState)
         val dateTimeString = arguments?.getString(YEAR_TO_OPEN)
         currentYear = (if (dateTimeString != null) DateTime.parse(dateTimeString) else DateTime()).toString(Formatter.YEAR_PATTERN).toInt()
+        if (savedInstanceState != null) {
+            currentYear = savedInstanceState.getInt(::currentYear.name)
+        }
         todayYear = DateTime().toString(Formatter.YEAR_PATTERN).toInt()
     }
 
@@ -49,6 +52,11 @@ class YearFragmentsHolder : MyFragmentHolder(), NavigationListener {
         return binding.root
     }
 
+    override fun onSaveInstanceState(outState: Bundle) {
+        outState.putInt(::currentYear.name, currentYear)
+        super.onSaveInstanceState(outState)
+    }
+
     private fun setupFragment() {
         val years = getYears(currentYear)
         val yearlyAdapter = MyYearPagerAdapter(requireActivity().supportFragmentManager, years, this)