Updated to be compatible with Android 26 or higher without need of java.util.Calendar

build.gradle

@@ -3,9 +3,14 @@
 buildscript {
     repositories {
         jcenter()
+        maven {
+            url 'https://maven.google.com/'
+            name 'Google'
+        }
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.1.3'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -19,5 +24,9 @@ allprojects {
 
     repositories {
         jcenter()
+        maven {
+            url 'https://maven.google.com/'
+            name 'Google'
+        }
     }
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Sun Aug 06 18:02:35 CEST 2017
+#Sat Jul 14 17:14:50 EDT 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

library/build.gradle

@@ -5,21 +5,21 @@ repositories {
 }
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion '25.0.2'
+    compileSdkVersion 28
+    buildToolsVersion '28.0.1'
 
     defaultConfig {
-        minSdkVersion 9
-        targetSdkVersion 25
+        minSdkVersion 26
+        targetSdkVersion 28
     }
 }
 
 configurations {
     javadocDeps
 }
 dependencies {
-    compile 'com.android.support:appcompat-v7:25.1.0'
-    javadocDeps 'com.android.support:appcompat-v7:25.1.0'
+    implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
+    javadocDeps 'com.android.support:appcompat-v7:28.0.0-alpha3'
 }
 
 apply from: 'gradle-mvn-push.gradle'

library/src/main/java/com/alamkanak/weekview/DateTimeInterpreter.java

@@ -1,12 +1,12 @@
 package com.alamkanak.weekview;
 
-import java.util.Calendar;
+import java.time.LocalDateTime;
 
 /**
  * Created by Raquib on 1/6/2015.
  */
 public interface DateTimeInterpreter {
-    public String interpretDate(Calendar date);
+    String interpretDate(LocalDateTime date);
 
-    public String interpretTime(int hour, int minutes);
+    String interpretTime(int hour, int minutes);
 }

library/src/main/java/com/alamkanak/weekview/MonthLoader.java

@@ -1,6 +1,7 @@
 package com.alamkanak.weekview;
 
-import java.util.Calendar;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
 import java.util.List;
 
 public class MonthLoader implements WeekViewLoader {
@@ -12,8 +13,8 @@ public MonthLoader(MonthChangeListener listener) {
     }
 
     @Override
-    public double toWeekViewPeriodIndex(Calendar instance) {
-        return instance.get(Calendar.YEAR) * 12 + instance.get(Calendar.MONTH) + (instance.get(Calendar.DAY_OF_MONTH) - 1) / 30.0;
+    public double toWeekViewPeriodIndex(LocalDateTime instance) {
+        return instance.getYear() * 12 + instance.getMonthValue() + (instance.getDayOfMonth() - 1) / 30.0;
     }
 
     @Override
@@ -32,11 +33,14 @@ public void setOnMonthChangeListener(MonthChangeListener onMonthChangeListener)
     public interface MonthChangeListener {
         /**
          * <p>Very important interface, it's the base to load events in the calendar.
-         * This method is called three times: once to load the previous month, once to load the next month and once to load the current month.</p>
-         * <strong>That's why you can have three times the same event at the same place if you mess up with the configuration</strong>
+         * This method is called three times: once to load the previous month, once to load the next month and once
+         * to load the current month.</p>
+         * <strong>That's why you can have three times the same event at the same place if you mess up with the
+         * configuration</strong>
          *
-         * @param newYear  : year of the events required by the view.
-         * @param newMonth : <p>month of the events required by the view </p><strong>1 based (not like JAVA API) : January = 1 and December = 12</strong>.
+         * @param newYear : year of the events required by the view.
+         * @param newMonth : <p>month of the events required by the view </p><strong>1 based (not like JAVA API) :
+         * January = 1 and December = 12</strong>.
          * @return a list of the events happening <strong>during the specified month</strong>.
          */
         List<? extends WeekViewEvent> onMonthChange(int newYear, int newMonth);