diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/attendance/AttendanceRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/attendance/AttendanceRepository.kt
index 22fe7fa5..68e7c5f1 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/attendance/AttendanceRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/attendance/AttendanceRepository.kt
@@ -5,7 +5,7 @@ import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.Inter
 import io.github.wulkanowy.data.db.entities.Attendance
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.monday
 import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
@@ -22,19 +22,19 @@ class AttendanceRepository @Inject constructor(
 ) {
 
     fun getAttendance(student: Student, semester: Semester, start: LocalDate, end: LocalDate, forceRefresh: Boolean): Single<List<Attendance>> {
-        return local.getAttendance(semester, start.monday, end.friday).filter { !forceRefresh }
+        return local.getAttendance(semester, start.monday, end.sunday).filter { !forceRefresh }
             .switchIfEmpty(ReactiveNetwork.checkInternetConnectivity(settings).flatMap {
-                if (it) remote.getAttendance(student, semester, start.monday, end.friday)
+                if (it) remote.getAttendance(student, semester, start.monday, end.sunday)
                 else Single.error(UnknownHostException())
             }.flatMap { newAttendance ->
-                local.getAttendance(semester, start.monday, end.friday)
+                local.getAttendance(semester, start.monday, end.sunday)
                     .toSingle(emptyList())
                     .doOnSuccess { oldAttendance ->
                         local.deleteAttendance(oldAttendance.uniqueSubtract(newAttendance))
                         local.saveAttendance(newAttendance.uniqueSubtract(oldAttendance))
                     }
             }.flatMap {
-                local.getAttendance(semester, start.monday, end.friday)
+                local.getAttendance(semester, start.monday, end.sunday)
                     .toSingle(emptyList())
             }).map { list -> list.filter { it.date in start..end } }
     }
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/completedlessons/CompletedLessonsRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/completedlessons/CompletedLessonsRepository.kt
index f31e3055..72cc93eb 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/completedlessons/CompletedLessonsRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/completedlessons/CompletedLessonsRepository.kt
@@ -5,7 +5,7 @@ import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.Inter
 import io.github.wulkanowy.data.db.entities.CompletedLesson
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.monday
 import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
@@ -22,20 +22,20 @@ class CompletedLessonsRepository @Inject constructor(
 ) {
 
     fun getCompletedLessons(student: Student, semester: Semester, start: LocalDate, end: LocalDate, forceRefresh: Boolean = false): Single<List<CompletedLesson>> {
-        return local.getCompletedLessons(semester, start.monday, end.friday).filter { !forceRefresh }
+        return local.getCompletedLessons(semester, start.monday, end.sunday).filter { !forceRefresh }
             .switchIfEmpty(ReactiveNetwork.checkInternetConnectivity(settings)
                 .flatMap {
-                    if (it) remote.getCompletedLessons(student, semester, start.monday, end.friday)
+                    if (it) remote.getCompletedLessons(student, semester, start.monday, end.sunday)
                     else Single.error(UnknownHostException())
                 }.flatMap { new ->
-                    local.getCompletedLessons(semester, start.monday, end.friday)
+                    local.getCompletedLessons(semester, start.monday, end.sunday)
                         .toSingle(emptyList())
                         .doOnSuccess { old ->
                             local.deleteCompleteLessons(old.uniqueSubtract(new))
                             local.saveCompletedLessons(new.uniqueSubtract(old))
                         }
                 }.flatMap {
-                    local.getCompletedLessons(semester, start.monday, end.friday)
+                    local.getCompletedLessons(semester, start.monday, end.sunday)
                         .toSingle(emptyList())
                 }).map { list -> list.filter { it.date in start..end } }
     }
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/exam/ExamRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/exam/ExamRepository.kt
index 452a1551..f29e4fdf 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/exam/ExamRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/exam/ExamRepository.kt
@@ -5,7 +5,7 @@ import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.Inter
 import io.github.wulkanowy.data.db.entities.Exam
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.monday
 import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
@@ -22,20 +22,20 @@ class ExamRepository @Inject constructor(
 ) {
 
     fun getExams(student: Student, semester: Semester, start: LocalDate, end: LocalDate, forceRefresh: Boolean = false): Single<List<Exam>> {
-        return local.getExams(semester, start.monday, end.friday).filter { !forceRefresh }
+        return local.getExams(semester, start.monday, end.sunday).filter { !forceRefresh }
             .switchIfEmpty(ReactiveNetwork.checkInternetConnectivity(settings)
                 .flatMap {
-                    if (it) remote.getExams(student, semester, start.monday, end.friday)
+                    if (it) remote.getExams(student, semester, start.monday, end.sunday)
                     else Single.error(UnknownHostException())
                 }.flatMap { new ->
-                    local.getExams(semester, start.monday, end.friday)
+                    local.getExams(semester, start.monday, end.sunday)
                         .toSingle(emptyList())
                         .doOnSuccess { old ->
                             local.deleteExams(old.uniqueSubtract(new))
                             local.saveExams(new.uniqueSubtract(old))
                         }
                 }.flatMap {
-                    local.getExams(semester, start.monday, end.friday)
+                    local.getExams(semester, start.monday, end.sunday)
                         .toSingle(emptyList())
                 }).map { list -> list.filter { it.date in start..end } }
     }
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/homework/HomeworkRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/homework/HomeworkRepository.kt
index 4454fd88..7e8fd5c3 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/homework/HomeworkRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/homework/HomeworkRepository.kt
@@ -5,7 +5,7 @@ import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.Inter
 import io.github.wulkanowy.data.db.entities.Homework
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.monday
 import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Completable
@@ -23,7 +23,7 @@ class HomeworkRepository @Inject constructor(
 ) {
 
     fun getHomework(student: Student, semester: Semester, start: LocalDate, end: LocalDate, forceRefresh: Boolean = false): Single<List<Homework>> {
-        return Single.fromCallable { start.monday to end.friday }.flatMap { (monday, friday) ->
+        return Single.fromCallable { start.monday to end.sunday }.flatMap { (monday, friday) ->
             local.getHomework(semester, monday, friday).filter { !forceRefresh }
                 .switchIfEmpty(ReactiveNetwork.checkInternetConnectivity(settings)
                     .flatMap {
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt
index 082b03cf..4a7a0eb2 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt
@@ -6,7 +6,7 @@ import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.db.entities.Timetable
 import io.github.wulkanowy.services.alarm.TimetableNotificationSchedulerHelper
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.monday
 import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
@@ -24,13 +24,13 @@ class TimetableRepository @Inject constructor(
 ) {
 
     fun getTimetable(student: Student, semester: Semester, start: LocalDate, end: LocalDate, forceRefresh: Boolean = false): Single<List<Timetable>> {
-        return Single.fromCallable { start.monday to end.friday }.flatMap { (monday, friday) ->
-            local.getTimetable(semester, monday, friday).filter { !forceRefresh }
+        return Single.fromCallable { start.monday to end.sunday }.flatMap { (monday, sunday) ->
+            local.getTimetable(semester, monday, sunday).filter { !forceRefresh }
                 .switchIfEmpty(ReactiveNetwork.checkInternetConnectivity(settings).flatMap {
-                    if (it) remote.getTimetable(student, semester, monday, friday)
+                    if (it) remote.getTimetable(student, semester, monday, sunday)
                     else Single.error(UnknownHostException())
                 }.flatMap { new ->
-                    local.getTimetable(semester, monday, friday)
+                    local.getTimetable(semester, monday, sunday)
                         .toSingle(emptyList())
                         .doOnSuccess { old ->
                             local.deleteTimetable(old.uniqueSubtract(new).also { schedulerHelper.cancelScheduled(it) })
@@ -46,7 +46,7 @@ class TimetableRepository @Inject constructor(
                             })
                         }
                 }.flatMap {
-                    local.getTimetable(semester, monday, friday).toSingle(emptyList())
+                    local.getTimetable(semester, monday, sunday).toSingle(emptyList())
                 }).map { list -> list.filter { it.date in start..end }.also { schedulerHelper.scheduleNotifications(it, student) } }
         }
     }
diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/works/AttendanceWork.kt b/app/src/main/java/io/github/wulkanowy/services/sync/works/AttendanceWork.kt
index e8579ddb..063b7482 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/works/AttendanceWork.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/works/AttendanceWork.kt
@@ -3,7 +3,7 @@ package io.github.wulkanowy.services.sync.works
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.attendance.AttendanceRepository
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.monday
 import io.reactivex.Completable
 import org.threeten.bp.LocalDate.now
@@ -12,7 +12,7 @@ import javax.inject.Inject
 class AttendanceWork @Inject constructor(private val attendanceRepository: AttendanceRepository) : Work {
 
     override fun create(student: Student, semester: Semester): Completable {
-        return attendanceRepository.getAttendance(student, semester, now().monday, now().friday, true)
+        return attendanceRepository.getAttendance(student, semester, now().monday, now().sunday, true)
             .ignoreElement()
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/works/CompletedLessonWork.kt b/app/src/main/java/io/github/wulkanowy/services/sync/works/CompletedLessonWork.kt
index 0da597e0..26f79a0d 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/works/CompletedLessonWork.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/works/CompletedLessonWork.kt
@@ -3,7 +3,7 @@ package io.github.wulkanowy.services.sync.works
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.completedlessons.CompletedLessonsRepository
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.monday
 import io.reactivex.Completable
 import org.threeten.bp.LocalDate.now
@@ -14,7 +14,7 @@ class CompletedLessonWork @Inject constructor(
 ) : Work {
 
     override fun create(student: Student, semester: Semester): Completable {
-        return completedLessonsRepository.getCompletedLessons(student, semester, now().monday, now().friday, true)
+        return completedLessonsRepository.getCompletedLessons(student, semester, now().monday, now().sunday, true)
             .ignoreElement()
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/works/ExamWork.kt b/app/src/main/java/io/github/wulkanowy/services/sync/works/ExamWork.kt
index c6110bbb..1ef97f59 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/works/ExamWork.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/works/ExamWork.kt
@@ -3,7 +3,7 @@ package io.github.wulkanowy.services.sync.works
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.exam.ExamRepository
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.monday
 import io.reactivex.Completable
 import org.threeten.bp.LocalDate.now
@@ -12,6 +12,6 @@ import javax.inject.Inject
 class ExamWork @Inject constructor(private val examRepository: ExamRepository) : Work {
 
     override fun create(student: Student, semester: Semester): Completable {
-        return examRepository.getExams(student, semester, now().monday, now().friday, true).ignoreElement()
+        return examRepository.getExams(student, semester, now().monday, now().sunday, true).ignoreElement()
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/works/HomeworkWork.kt b/app/src/main/java/io/github/wulkanowy/services/sync/works/HomeworkWork.kt
index cf348439..186d57b0 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/works/HomeworkWork.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/works/HomeworkWork.kt
@@ -3,7 +3,7 @@ package io.github.wulkanowy.services.sync.works
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.homework.HomeworkRepository
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.monday
 import io.reactivex.Completable
 import org.threeten.bp.LocalDate.now
@@ -12,6 +12,6 @@ import javax.inject.Inject
 class HomeworkWork @Inject constructor(private val homeworkRepository: HomeworkRepository) : Work {
 
     override fun create(student: Student, semester: Semester): Completable {
-        return homeworkRepository.getHomework(student, semester, now().monday, now().friday, true).ignoreElement()
+        return homeworkRepository.getHomework(student, semester, now().monday, now().sunday, true).ignoreElement()
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/works/TimetableWork.kt b/app/src/main/java/io/github/wulkanowy/services/sync/works/TimetableWork.kt
index 0990ed67..d79d2403 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/works/TimetableWork.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/works/TimetableWork.kt
@@ -3,7 +3,7 @@ package io.github.wulkanowy.services.sync.works
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.timetable.TimetableRepository
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.monday
 import io.reactivex.Completable
 import org.threeten.bp.LocalDate.now
@@ -12,7 +12,7 @@ import javax.inject.Inject
 class TimetableWork @Inject constructor(private val timetableRepository: TimetableRepository) : Work {
 
     override fun create(student: Student, semester: Semester): Completable {
-        return timetableRepository.getTimetable(student, semester, now().monday, now().friday, true)
+        return timetableRepository.getTimetable(student, semester, now().monday, now().sunday, true)
             .ignoreElement()
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamPresenter.kt
index 1c47cc7d..1140cb02 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamPresenter.kt
@@ -8,7 +8,7 @@ import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.getLastSchoolDayIfHoliday
 import io.github.wulkanowy.utils.isHolidays
 import io.github.wulkanowy.utils.monday
@@ -110,7 +110,7 @@ class ExamPresenter @Inject constructor(
             add(studentRepository.getCurrentStudent()
                 .flatMap { student ->
                     semesterRepository.getCurrentSemester(student).flatMap { semester ->
-                        examRepository.getExams(student, semester, currentDate.monday, currentDate.friday, forceRefresh)
+                        examRepository.getExams(student, semester, currentDate.monday, currentDate.sunday, forceRefresh)
                     }
                 }
                 .map { createExamItems(it) }
@@ -181,7 +181,7 @@ class ExamPresenter @Inject constructor(
             showPreButton(!currentDate.minusDays(7).isHolidays)
             showNextButton(!currentDate.plusDays(7).isHolidays)
             updateNavigationWeek("${currentDate.monday.toFormattedString("dd.MM")} - " +
-                currentDate.friday.toFormattedString("dd.MM"))
+                currentDate.sunday.toFormattedString("dd.MM"))
         }
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkPresenter.kt
index fafc3319..41735a23 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkPresenter.kt
@@ -8,7 +8,7 @@ import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
-import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.getLastSchoolDayIfHoliday
 import io.github.wulkanowy.utils.isHolidays
 import io.github.wulkanowy.utils.monday
@@ -175,7 +175,7 @@ class HomeworkPresenter @Inject constructor(
             showPreButton(!currentDate.minusDays(7).isHolidays)
             showNextButton(!currentDate.plusDays(7).isHolidays)
             updateNavigationWeek("${currentDate.monday.toFormattedString("dd.MM")} - " +
-                currentDate.friday.toFormattedString("dd.MM"))
+                currentDate.sunday.toFormattedString("dd.MM"))
         }
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/utils/SchooldaysRangeLimiter.kt b/app/src/main/java/io/github/wulkanowy/utils/SchooldaysRangeLimiter.kt
index 922aafbd..46a707ab 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/SchooldaysRangeLimiter.kt
+++ b/app/src/main/java/io/github/wulkanowy/utils/SchooldaysRangeLimiter.kt
@@ -17,7 +17,7 @@ class SchooldaysRangeLimiter : DateRangeLimiter {
     override fun isOutOfRange(year: Int, month: Int, day: Int): Boolean {
         val date = LocalDate.of(year, month + 1, day)
         val dayOfWeek = date.dayOfWeek
-        return dayOfWeek == DayOfWeek.SUNDAY || dayOfWeek == DayOfWeek.SATURDAY || date.isHolidays
+        return dayOfWeek == DayOfWeek.SUNDAY || date.isHolidays
     }
 
     override fun getStartDate(): Calendar {
diff --git a/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt b/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
index 8d022fc5..802b2ee0 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
+++ b/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
@@ -92,8 +92,8 @@ inline val LocalDate.weekDayName: String
 inline val LocalDate.monday: LocalDate
     get() = with(MONDAY)
 
-inline val LocalDate.friday: LocalDate
-    get() = with(FRIDAY)
+inline val LocalDate.sunday: LocalDate
+    get() = with(SUNDAY)
 
 /**
  * [Dz.U. 2016 poz. 1335](http://prawo.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20160001335)
diff --git a/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt b/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt
index 024b4727..72d08c41 100644
--- a/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt
+++ b/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt
@@ -38,12 +38,12 @@ class TimeExtensionTest {
     }
 
     @Test
-    fun fridayTest() {
-        assertEquals(of(2018, 10, 5), of(2018, 10, 2).friday)
-        assertEquals(of(2018, 10, 5), of(2018, 10, 5).friday)
-        assertEquals(of(2018, 10, 5), of(2018, 10, 6).friday)
-        assertEquals(of(2018, 10, 5), of(2018, 10, 7).friday)
-        assertEquals(of(2018, 10, 12), of(2018, 10, 8).friday)
+    fun sundayTestTest() {
+        assertEquals(of(2018, 10, 7), of(2018, 10, 2).sunday)
+        assertEquals(of(2018, 10, 7), of(2018, 10, 5).sunday)
+        assertEquals(of(2018, 10, 7), of(2018, 10, 6).sunday)
+        assertEquals(of(2018, 10, 7), of(2018, 10, 7).sunday)
+        assertEquals(of(2018, 10, 14), of(2018, 10, 8).sunday)
     }
 
     @Test