diff --git a/jc/utils.py b/jc/utils.py
index 6e7082d7..e5a06eb8 100644
--- a/jc/utils.py
+++ b/jc/utils.py
@@ -122,14 +122,14 @@ def parse_datetime_to_timestamp(data):
     utc_tz = True if 'UTC' in data else False
 
     formats = [
-        {'id': 1, 'format': '%c', 'locale': None},  # C locale format conversion, or date cli command in C locale with non-UTC tz: Tue Mar 23 16:12:11 2021 or Tue Mar 23 16:12:11 IST 2021
-        {'id': 2, 'format': '%a %d %b %Y %I:%M:%S %p %Z', 'locale': None},  # en_US.UTF-8 local format (found in upower cli output): Tue 23 Mar 2021 04:12:11 PM UTC
-        {'id': 3, 'format': '%a %d %b %Y %I:%M:%S %p', 'locale': None},  # en_US.UTF-8 local format with non-UTC tz (found in upower cli output): Tue 23 Mar 2021 04:12:11 PM IST
-        {'id': 4, 'format': '%A %d %B %Y %I:%M:%S %p %Z', 'locale': None},  # European local format (found in upower cli output): Tuesday 01 October 2019 12:50:41 PM UTC
-        {'id': 5, 'format': '%A %d %B %Y %I:%M:%S %p', 'locale': None},  # European local format with non-UTC tz (found in upower cli output): Tuesday 01 October 2019 12:50:41 PM IST
-        {'id': 6, 'format': '%a %b %d %I:%M:%S %p %Z %Y', 'locale': None},  # date cli command in en_US.UTF-8 format: Wed Mar 24 06:16:19 PM UTC 2021
-        {'id': 7, 'format': '%a %b %d %H:%M:%S %Z %Y', 'locale': None},  # date cli command in C locale format: Wed Mar 24 11:11:30 UTC 2021
-        {'id': 8, 'format': '%c', 'locale': ''}  # locally configured locale format conversion: Could be anything :) this is a last-gasp attempt
+        {'id': 1000, 'format': '%c', 'locale': None},  # C locale format conversion, or date cli command in C locale with non-UTC tz: Tue Mar 23 16:12:11 2021 or Tue Mar 23 16:12:11 IST 2021
+        {'id': 2000, 'format': '%a %d %b %Y %I:%M:%S %p %Z', 'locale': None},  # en_US.UTF-8 local format (found in upower cli output): Tue 23 Mar 2021 04:12:11 PM UTC
+        {'id': 3000, 'format': '%a %d %b %Y %I:%M:%S %p', 'locale': None},  # en_US.UTF-8 local format with non-UTC tz (found in upower cli output): Tue 23 Mar 2021 04:12:11 PM IST
+        {'id': 4000, 'format': '%A %d %B %Y %I:%M:%S %p %Z', 'locale': None},  # European local format (found in upower cli output): Tuesday 01 October 2019 12:50:41 PM UTC
+        {'id': 5000, 'format': '%A %d %B %Y %I:%M:%S %p', 'locale': None},  # European local format with non-UTC tz (found in upower cli output): Tuesday 01 October 2019 12:50:41 PM IST
+        {'id': 6000, 'format': '%a %b %d %I:%M:%S %p %Z %Y', 'locale': None},  # date cli command in en_US.UTF-8 format: Wed Mar 24 06:16:19 PM UTC 2021
+        {'id': 7000, 'format': '%a %b %d %H:%M:%S %Z %Y', 'locale': None},  # date cli command in C locale format: Wed Mar 24 11:11:30 UTC 2021
+        {'id': 9000, 'format': '%c', 'locale': ''}  # locally configured locale format conversion: Could be anything :) this is a last-gasp attempt
     ]
 
     # from https://www.timeanddate.com/time/zones/
diff --git a/tests/test_utils.py b/tests/test_utils.py
new file mode 100644
index 00000000..916b54b9
--- /dev/null
+++ b/tests/test_utils.py
@@ -0,0 +1,28 @@
+import unittest
+import jc.utils
+
+
+class MyTests(unittest.TestCase):
+    def test_utils_parse_datetime_to_timestamp(self):
+
+        # naive timestamps created in PDT
+        datetime_map = {
+            # C locale format conversion, or date cli command in C locale with non-UTC tz
+            'Tue Mar 23 16:12:11 2021': {'format': 1000, 'timestamp_naive': 1616541131, 'timestamp_utc': None},
+            'Tue Mar 23 16:12:11 IST 2021': {'format': 1000, 'timestamp_naive': 1616541131, 'timestamp_utc': None},
+            # en_US.UTF-8 local format (found in upower cli output)
+            'Tue 23 Mar 2021 04:12:11 PM UTC': {'format': 2000, 'timestamp_naive': 1616541131, 'timestamp_utc': 1616515931},
+            # en_US.UTF-8 local format with non-UTC tz (found in upower cli output)
+            'Tue 23 Mar 2021 04:12:11 PM IST': {'format': 3000, 'timestamp_naive': 1616541131, 'timestamp_utc': None},
+            # European local format (found in upower cli output)
+            'Tuesday 01 October 2019 12:50:41 PM UTC': {'format': 4000, 'timestamp_naive': 1569959441, 'timestamp_utc': 1569934241},
+            # European local format with non-UTC tz (found in upower cli output)
+            'Tuesday 01 October 2019 12:50:41 PM IST': {'format': 5000, 'timestamp_naive': 1569959441, 'timestamp_utc': None},
+            # date cli command in en_US.UTF-8 format
+            'Wed Mar 24 06:16:19 PM UTC 2021': {'format': 6000, 'timestamp_naive': 1616634979, 'timestamp_utc': 1616609779},
+            # date cli command in C locale format
+            'Wed Mar 24 11:11:30 UTC 2021': {'format': 7000, 'timestamp_naive': 1616609490, 'timestamp_utc': 1616584290}
+        }
+
+        for input_string, expected_output in datetime_map.items():
+            self.assertEqual(jc.utils.parse_datetime_to_timestamp(input_string), expected_output)