diff --git a/app/src/main/java/com/github/cmput301f21t44/hellohabits/model/Habit.java b/app/src/main/java/com/github/cmput301f21t44/hellohabits/model/Habit.java
index bba9798..46bf434 100644
--- a/app/src/main/java/com/github/cmput301f21t44/hellohabits/model/Habit.java
+++ b/app/src/main/java/com/github/cmput301f21t44/hellohabits/model/Habit.java
@@ -4,13 +4,6 @@
 import java.util.List;
 
 public interface Habit {
-    static final int MONDAY = 0;
-    static final int TUESDAY = 1;
-    static final int WEDNESDAY = 2;
-    static final int THURSDAY = 3;
-    static final int FRIDAY = 4;
-    static final int SATURDAY = 5;
-    static final int SUNDAY = 6;
 
     String getId();
 
@@ -21,5 +14,20 @@ public interface Habit {
     Instant getDateStarted();
 
     List<HabitEvent> getEvents();
+
     boolean[] getDaysOfWeek();
+
+    static boolean isInDay(Instant today, boolean[] dayOfWeek) {
+        // dayOfWeek goes from 1-7 (Monday-Sunday)
+        int dayOfWeek = today.atZone(ZoneId.systemDefault()).getDayOfWeek().getValue();
+
+        // daysOfWeek is an array that matches the checkBox for viewing.
+        // in case today is Monday:
+        // [true, true ,true, true, true, true, true] = every day
+        // [true, false , false, false, false, false, false] = only on monday
+        // [true, false , false, false, false, false, true] = for monday and sunday 
+        return daysOfWeek[dayOfWeek-1]
+    }
+
+
 }
diff --git a/app/src/main/java/com/github/cmput301f21t44/hellohabits/view/TodaysHabitsFragment.java b/app/src/main/java/com/github/cmput301f21t44/hellohabits/view/TodaysHabitsFragment.java
index 03962cf..187bab8 100644
--- a/app/src/main/java/com/github/cmput301f21t44/hellohabits/view/TodaysHabitsFragment.java
+++ b/app/src/main/java/com/github/cmput301f21t44/hellohabits/view/TodaysHabitsFragment.java
@@ -54,10 +54,17 @@ public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
     @Override
     public void onStart() {
         super.onStart();
-        mHabitViewModel.getAllHabits().observe(this, list -> {
-            // need to cast List<HabitEntity> to List<Habit>
-            List<Habit> habits = new ArrayList<>(list);
-            adapter.submitList(habits);
+        mHabitViewModel.getAllHabits().observe(this, habitList -> {
+            List<Habit> todaysHabits = new ArrayList<>();
+            Instant today = Instant.now();
+            // traverse all h in habitList, and only masks in those who matches the checkBox
+            // checkBox implementation can be seen in isInDay() from Habit.java
+            for (Habit h : habitList) {
+                if (Habit.isInDay(today, h.getDaysOfWeek())) {
+                    todaysHabits.add(h);
+                }
+            }
+            adapter.submitList(todaysHabits);
         });
     }