Update

app/src/main/java/com/example/tasktracker/Activities/DatePickerFragment.java

@@ -0,0 +1,22 @@
+package com.example.tasktracker.Activities;
+
+import android.app.DatePickerDialog;
+import android.app.Dialog;
+import android.os.Bundle;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.DialogFragment;
+import java.util.Calendar;
+
+public class DatePickerFragment extends DialogFragment {
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
+        Calendar mCalendar = Calendar.getInstance();
+        int year = mCalendar.get(Calendar.YEAR);
+        int month = mCalendar.get(Calendar.MONTH);
+        int dayOfMonth = mCalendar.get(Calendar.DAY_OF_MONTH);
+        return new DatePickerDialog(getActivity(), (DatePickerDialog.OnDateSetListener)
+                getActivity(), year, month, dayOfMonth);
+    }
+}