diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..f8c1b79
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,6 @@
+"""add_task.py updated"""
+"""complete_task.py updated"""
+"""view_tasks.py updated"""
+11/18/2025
+
+"""added export_data.py and what changed"""
diff --git a/README.md b/README.md
index e69de29..7f5b060 100644
--- a/README.md
+++ b/README.md
@@ -0,0 +1,4 @@
+"""
+#During Sprint 2, the add_task file was expanded to include an optional validated due_date, and every new task is created with a completion_date. 
+#This fixed the fact that Sprint 1 had an inconsistent JSON structure for add_tasks. view_tasks.py was improved to sort tasks by priority, show or hide completed tasks with a --show-completed flag, and display the new due-date and completion-date fields. complete_task.py was updated so finishing a task now records a timestamp and supports
+# undoing completion. export_tasks.py was added, providing CSV/TXT export and filters for completed or pending tasks. 
diff --git a/add_task.py b/add_task.py
index c3662fa..b732a24 100644
--- a/add_task.py
+++ b/add_task.py
@@ -1,65 +1,35 @@
 import json
-import os
-
-DATA_FILE = "data.json"
-
-def load_data():
-    """Load task data from data.json or create default structure."""
-    if os.path.exists(DATA_FILE):
-        with open(DATA_FILE, "r") as f:
-            return json.load(f)
-    return {
-        "tasks": [],
-        "settings": {
-            "app_name": "Task Manager",
-            "version": "1.0.0",
-            "max_tasks": 100
-        }
-    }
-
-def save_data(data):
-    """Save task data back to data.json."""
-    with open(DATA_FILE, "w") as f:
-        json.dump(data, f, indent=4)
-
-def get_next_id(tasks):
-    """Return the next task ID."""
-    if not tasks:
-        return 1
-    highest = 0
-    for t in tasks:
-        if int(t.get("id", 0)) > highest:
-            highest = int(t["id"])
-    return highest + 1
-
-def add_task(description, priority):
-    """Add a new task with description and priority."""
-    data = load_data()
-    tasks = data["tasks"]
-
-    max_tasks = data.get("settings", {}).get("max_tasks", 100)
-    if len(tasks) >= max_tasks:
-        print("You have reached the maximum number of tasks.")
-        return
-
-    new_task = {
-        "id": get_next_id(tasks),
-        "description": description,
-        "priority": priority,
-        "completed": False
-    }
-
-    tasks.append(new_task)
-    save_data(data)
-    print(" Task added:", description, "(Priority:", priority + ")")
-
-if __name__ == "__main__":
-    print("Enter task description:")
-    desc = input().strip()
-    print("Enter priority (high, medium, low):")
-    prio = input().strip().lower()
-    if prio not in ["high", "medium", "low"]:
-        print("Priority must be: high, medium, or low.")
-    else:
-        add_task(desc, prio)
+import re
+DATA_FILE="data.json"
+
+def is_valid_date(d):
+	"""Validate YYYY--MM--DD format"""
+	return re.match(r"^\d{4}-\d{2}-\d{2}$",d) is not None
+
+def add_task():
+	description=input("Enter task description: ").strip()
+	priority=input("Enter priority (high/medium/low): ").strip().lower()
+	due_date=input("Enter due date (YYYY-MM-DD) or press Enter to skip: ")
+	if due_date=="":
+		due_date=None
+	elif not is_valid_date(due_date):
+		print("Invalid date format. Must be YYYY-MM-DD.")
+		return
+	with open(DATA_FILE,"r") as f:
+		data=json.load(f)
+	task_id=len(data["tasks"])+1
+	new_task={
+		"id":task_id,
+		"description":description,
+		"priority": priority,
+		"completed": False,
+		"due_date":due_date,
+		"completion_date":None
+	}
+	data["tasks"].append(new_task)
+	with open(DATA_FILE,"w") as f:
+		json.dump(data,f,indent=4)
+	print(f"Task #{task_id} added successfully!")
+if __name__=="__main__":
+	add_task()
 
diff --git a/complete_task.py b/complete_task.py
index 53f4f38..2875faf 100644
--- a/complete_task.py
+++ b/complete_task.py
@@ -1,38 +1,37 @@
 import json
+from datetime import datetime
+
 DATA_FILE="data.json"
-def load_tasks():
-	if not os.path.exists(DATA_FILE):
-		print("Error: data.json file not found.")
-		return {"tasks":[]}
+
+def complete_task():
+	task_id=input("Enter task ID to complete: ").strip()
+	if not task_id.isdigit():
+		print("Invalid ID format.")
+		return
+	task_id=int(task_id)
 	with open(DATA_FILE,"r") as f:
 		data=json.load(f)
-	return data
-def save_tasks(data):
-	with open(DATA_FILE,"w") as f:
-		json.dump(data,f,indent=4)
-
-def complete_task(task_id):
-	data=load_tasks()
-	tasks=data["tasks"]
-	found=False
-	for task in tasks:
-		if task["id"]==task_id:
-			found=True
-			if task["completed"]:
-				print("Task",task_id,"is already completed.")
-			else:
-				task["completed"]=True
-				save_tasks(data)
-				print("Task",task_id,"marked as completed.")
+	found=None
+	for t in data["tasks"]:
+		if t["id"] == task_id:
+			found=t
 			break
 	if not found:
-		print("Task with ID",task_id,"not found.")
-if __name__=="__main__":
-	import os
-	print("Enter the task to complete:")
-	task_id_input=input().strip()
-	if task_id_input.isdigit():
-		task_id=int(task_id_input)
-		complete_task(task_id)
+		print("Task not found.")
+		return
+	if found["completed"]:
+		undo=input("Task is already completed. Undo completion? (yes/no): ")
+		if undo=="yes":
+			found["completed"]=False
+			found["completion_date"]=None
+			print("Completion undone.")
+		else:
+			print("No changes made.")
 	else:
-		print("Please enter a valid task ID number.")
+		found["completed"]=True
+		found["completion_date"]=datetime.now().strftime("%Y-%m-%d")
+		print("Task marked completed!")
+	with open(DATA_FILE,"w") as f:
+		json.dump(data,f,indent=4)
+if __name__=="__main__":
+	complete_task()
diff --git a/data.json b/data.json
index 4a07190..5376a53 100644
--- a/data.json
+++ b/data.json
@@ -1,8 +1,13 @@
 {
-  "tasks":[],
-  "settings":{
-    "app_name":"Task Manager",
-    "version":"1.0.0",
-    "max_tasks":100
-  }
+  "tasks": [
+    {
+      "id": 1,
+      "description": "Do something",
+      "priority": "high",
+      "completed": false,
+      "due_date": null,
+      "completion_date": null
+    }
+  ]
 }
+
diff --git a/delete_task.py b/delete_task.py
index e69de29..8b13789 100644
--- a/delete_task.py
+++ b/delete_task.py
@@ -0,0 +1 @@
+
diff --git a/deleted.log b/deleted.log
new file mode 100644
index 0000000..86da04a
--- /dev/null
+++ b/deleted.log
@@ -0,0 +1 @@
+[2025-11-19 05:17:13] Deleted Task ID=1 | "Finish homework"
diff --git a/export_tasks.py b/export_tasks.py
new file mode 100644
index 0000000..b1df345
--- /dev/null
+++ b/export_tasks.py
@@ -0,0 +1,87 @@
+import json
+import os
+import sys
+from datetime import datetime
+
+DATA_FILE = "data.json"
+
+PRIORITY_ORDER = {
+    "high": 1,
+    "medium": 2,
+    "low": 3
+}
+
+
+def load_data():
+    """Load tasks from JSON file."""
+    if os.path.exists(DATA_FILE):
+        with open(DATA_FILE, "r") as f:
+            return json.load(f)
+    return {"tasks": []}
+
+
+def export_to_csv(tasks, filename="tasks_export.csv"):
+    """Write tasks to a CSV file."""
+    with open(filename, "w") as f:
+        f.write("id,description,priority,completed,due_date,completion_date\n")
+        for t in tasks:
+            f.write(f"{t['id']},"
+                    f"\"{t['description']}\","
+                    f"{t['priority']},"
+                    f"{t['completed']},"
+                    f"{t.get('due_date','')},"
+                    f"{t.get('completion_date','')}\n")
+    print(f"Export complete! File saved as {filename}")
+
+
+def export_to_txt(tasks, filename="tasks_export.txt"):
+    """Write tasks to a TXT file."""
+    with open(filename, "w") as f:
+        for t in tasks:
+            f.write(f"ID: {t['id']}\n")
+            f.write(f"Description: {t['description']}\n")
+            f.write(f"Priority: {t['priority']}\n")
+            f.write(f"Completed: {t['completed']}\n")
+            f.write(f"Due Date: {t.get('due_date','None')}\n")
+            f.write(f"Completion Date: {t.get('completion_date','None')}\n")
+            f.write("-" * 40 + "\n")
+    print(f"Export complete! File saved as {filename}")
+
+
+def export_tasks():
+    args = sys.argv[1:]
+
+    data = load_data()
+    tasks = data.get("tasks", [])
+
+    # Filter flags
+    completed_only = "--completed-only" in args
+    pending_only = "--pending-only" in args
+    export_txt = "--txt" in args
+
+    if completed_only and pending_only:
+        print("Error: Cannot use --completed-only and --pending-only together.")
+        return
+
+    if completed_only:
+        tasks = [t for t in tasks if t.get("completed")]
+    elif pending_only:
+        tasks = [t for t in tasks if not t.get("completed")]
+
+    # Sort tasks by priority for consistent output
+    tasks.sort(key=lambda t: PRIORITY_ORDER.get(t["priority"], 99))
+
+    if not tasks:
+        print("No tasks match the selected filters.")
+        return
+
+    # Choose file format
+    if export_txt:
+        export_to_txt(tasks)
+    else:
+        export_to_csv(tasks)
+
+
+if __name__ == "__main__":
+    export_tasks()
+
diff --git a/tasks_export.csv b/tasks_export.csv
new file mode 100644
index 0000000..d2f9be7
--- /dev/null
+++ b/tasks_export.csv
@@ -0,0 +1,2 @@
+id,description,priority,completed,due_date,completion_date
+1,"Do something",high,False,None,None
diff --git a/view_tasks.py b/view_tasks.py
index 4d37c7a..f117560 100644
--- a/view_tasks.py
+++ b/view_tasks.py
@@ -1,34 +1,32 @@
 import json
-import os
+import sys
+DATA_FILE="data.json"
 
-DATA_FILE = "data.json"
-
-def load_data():
-    """Load tasks from JSON file or return empty list wrapper."""
-    if os.path.exists(DATA_FILE):
-        with open(DATA_FILE, "r") as f:
-            return json.load(f)
-    return {"tasks": []}
+PRIORITY_ORDER={
+	"high":1,
+	"medium":2,
+	"low":3
+}
 
 def view_tasks():
-    """Display all tasks neatly with ID, status, priority, description."""
-    data = load_data()
-    tasks = data.get("tasks", [])
-
-    if not tasks:
-        print("No tasks available.")
-        return
-
-    print("\n Task List")
-    print("-" * 50)
-    for task in tasks:
-        status = " Completed" if task.get("completed") else " Not Completed"
-        print("ID:", task.get("id"))
-        print("Description:", task.get("description"))
-        print("Priority:", task.get("priority"))
-        print("Status:", status)
-        print("-" * 50)
-
-if __name__ == "__main__":
-    view_tasks()
-
+	show_completed="--show-completed" in sys.argv
+	with open(DATA_FILE,"r") as f:
+		data=json.load(f)
+	tasks=data["tasks"]
+	if not show_completed:
+		tasks=[t for t in tasks if not t["completed"]]
+	tasks.sort(key=lambda t: PRIORITY_ORDER.get(t["priority"],99))
+	if not tasks:
+		print("No tasks to display.")
+		return
+	for t in tasks:
+		status="Completed" if t["completed"] else "Pending"
+		due=t["due_date"] if t["due_date"] else "None"
+		print(f"[{t['id']}] {t['description']} ({t['priority']})")
+		print(f"       Due: {due}")
+		print(f"       Status: {status}")
+		if t["completion_date"]:
+			print(f"          Completed on: {t['completion_date']}")
+		print()
+if __name__=="__main__":
+	view_tasks()