diff --git a/communicator/api.yml b/communicator/api.yml
index d3b3097..26fd9a9 100644
--- a/communicator/api.yml
+++ b/communicator/api.yml
@@ -167,6 +167,12 @@ paths:
           description: Return all samples modified AFTER the given date, provided as an ISO string (ex '2021-01-01T01:01:00')
           schema:
             type: string
+        - in: query
+          name: created_on
+          required: false
+          description: Return all samples added to the database AFTER the given date, provided as an ISO string (ex '2021-01-01T01:01:00')
+          schema:
+            type: string
       responses:
         '200':
           description: a list of samples
diff --git a/communicator/api/admin.py b/communicator/api/admin.py
index 38d8161..45a0514 100644
--- a/communicator/api/admin.py
+++ b/communicator/api/admin.py
@@ -36,11 +36,14 @@ def add_sample(body):
     SampleService().add_or_update_records([sample])
 
 
-def get_samples(last_modified=None):
+def get_samples(last_modified=None, created_on=None):
     query = db.session.query(Sample)
     if last_modified:
         lm_date = datetime.fromisoformat(last_modified)
         query = query.filter(Sample.last_modified > lm_date)
+    if created_on:
+        co_date = datetime.fromisoformat(created_on)
+        query = query.filter(Sample.created_on > co_date)
     samples = query.order_by(Sample.last_modified).limit(200).all()
     response = SampleSchema(many=True).dump(samples)
     return response
diff --git a/communicator/models/sample.py b/communicator/models/sample.py
index 16ccad2..76a2d4e 100644
--- a/communicator/models/sample.py
+++ b/communicator/models/sample.py
@@ -13,6 +13,7 @@ class Sample(db.Model):
     student_id = db.Column(db.Integer)
     computing_id = db.Column(db.String)
     date = db.Column(db.DateTime)
+    created_on = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
     last_modified = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.now, nullable=False)
     location = db.Column(db.Integer)
     station = db.Column(db.Integer)
diff --git a/tests/services/test_sample_endpoints.py b/tests/services/test_sample_endpoints.py
index 1620b4c..21a5eb5 100644
--- a/tests/services/test_sample_endpoints.py
+++ b/tests/services/test_sample_endpoints.py
@@ -178,3 +178,47 @@ class TestSampleEndpoint(BaseTest):
                           headers={'X-CR-API-KEY': app.config.get('API_TOKEN')})
         data = json.loads(rv.get_data(as_text=True))
         self.assertEqual(0, len(data))
+
+    def test_get_all_samples_by_created_on(self):
+        d1_str = '202012300101'  # dec 30th 2020
+        d1 = datetime.strptime(d1_str, '%Y%m%d%H%M')
+        s1_bar_code = '000000111-' + d1_str + '-4321'
+
+        d2_str = '202101010101'  # Jan 1st 2021
+        d2 = datetime.strptime(d2_str, '%Y%m%d%H%M')
+        s2_bar_code = '000000111-' + d2_str + '-4321'
+
+        d3_str = '202101010101'  # Jan 5th 2021
+        d3 = datetime.strptime(d3_str, '%Y%m%d%H%M')
+
+        s1 = Sample(barcode=s1_bar_code,
+                    location="4321",
+                    date=datetime.now(),
+                    created_on=d1,
+                    last_modified=d3,  # Note Modified date is later than created date.
+                    student_id="000000111",
+                    email="daniel.h.funk@gmail.com",
+                    result_code="12345",
+                    ivy_file="xxx",
+                    email_notified=True,
+                    text_notified=True)
+        s2 = Sample(barcode=s2_bar_code,
+                    location="4321",
+                    date=datetime.now(),
+                    created_on=d2,
+                    last_modified=d2,
+                    student_id="000000112",
+                    email="dan@gmail.com",
+                    result_code="12345",
+                    ivy_file="yyy",
+                    email_notified=False,
+                    text_notified=False)
+        db.session.add(s1)
+        db.session.add(s2)
+
+        created_on_arg = d1.isoformat()
+        rv = self.app.get(f'/v1.0/sample?created_on={created_on_arg}', content_type="application/json",
+                          headers={'X-CR-API-KEY': app.config.get('API_TOKEN')})
+        data = json.loads(rv.get_data(as_text=True))
+        self.assertEqual(1, len(data)) # Even through s1 was modified on the 4th, it isn't returned.
+        self.assertEqual(s2.barcode, data[0]['barcode'])