Iron out some incompatibilities from the merge

src/main/java/duke/task/Deadline.java

@@ -63,10 +63,10 @@ public String toString() {
     /**
      * Exports this Deadline for saving to disk.
      *
-     * @return A string representation of this task containing the type marker E and a time.
+     * @return A string representation of this task containing the type marker D and a time.
      */
     @Override
     public String export() {
-        return "D|" + super.export() + "|" + by;
+        return "D|" + super.export() + "|" + by.format(inputFormatter);
     }
 }

src/main/java/duke/task/Event.java

@@ -67,6 +67,6 @@ public String toString() {
      */
     @Override
     public String export() {
-        return "E|" + super.export() + "|" + at;
+        return "E|" + super.export() + "|" + at.format(inputFormatter);
     }
 }

src/main/java/duke/task/TaskList.java

@@ -1,5 +1,7 @@
 package duke.task;
 
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 
 /**
@@ -8,6 +10,7 @@
  */
 public class TaskList {
     private final ArrayList<Task> tasks;
+    private static final DateTimeFormatter inputFormatter = DateTimeFormatter.ofPattern("d/M/yyyy HHmm");
 
     /**
      * Initializes an empty task list.
@@ -31,10 +34,10 @@ public TaskList(ArrayList<String> stringTasks) {
                 t = new Todo(fields[2]);
                 break;
             case "E":
-                t = new Event(fields[2], fields[3]);
+                t = new Event(fields[2], LocalDateTime.parse(fields[3], inputFormatter));
                 break;
             case "D":
-                t = new Deadline(fields[2], fields[3]);
+                t = new Deadline(fields[2], LocalDateTime.parse(fields[3], inputFormatter));
                 break;
             default:
                 t = new Todo("nothing");