diff --git a/tests/parsers/agilent_gen5/plate_number_test.py b/tests/parsers/agilent_gen5/plate_number_test.py
index 552f5ea12..2e8324c2d 100644
--- a/tests/parsers/agilent_gen5/plate_number_test.py
+++ b/tests/parsers/agilent_gen5/plate_number_test.py
@@ -1,3 +1,4 @@
+from datetime import timedelta, timezone
 from typing import Optional
 
 import pytest
@@ -5,30 +6,43 @@
 from allotropy.exceptions import AllotropeConversionError
 from allotropy.parser_factory import get_parser, Vendor
 from allotropy.parsers.agilent_gen5.plate_data import PlateNumber
+from allotropy.parsers.utils.timestamp_parser import TimestampParser
 
-TIMESTAMP_PARSER = get_parser(Vendor.AGILENT_GEN5).timestamp_parser
+PARSER_UTC = get_parser(Vendor.AGILENT_GEN5).timestamp_parser
+PARSER_UTC_MINUS_5 = get_parser(
+    Vendor.AGILENT_GEN5, timezone(timedelta(hours=-5))
+).timestamp_parser
 
 
 @pytest.mark.parametrize(
-    "date_,time_,expected",
+    "date_,time_,expected,timestamp_parser",
     [
-        ("1/2/2024", "10:48:38 AM", "2024-01-02T10:48:38+00:00"),
-        ("1/31/2024", "10:48:38 AM", "2024-01-31T10:48:38+00:00"),
-        ("2/1/2024", "10:48:38 AM", "2024-02-01T10:48:38+00:00"),
-        ("1/31/2024", "10:48:38", "2024-01-31T10:48:38+00:00"),
-        ("31/1/2024", "10:48:38", "2024-01-31T10:48:38+00:00"),
-        ("2/1/2024", "10:48:38", "2024-02-01T10:48:38+00:00"),
-        ("2/1/2024", "10:48:38 EST", "2024-02-01T10:48:38-05:00"),
-        ("mydate", "mytime", None),
+        ("1/2/2024", "10:48:38 AM", "2024-01-02T10:48:38+00:00", PARSER_UTC),
+        ("1/31/2024", "10:48:38 AM", "2024-01-31T10:48:38+00:00", PARSER_UTC),
+        ("2/1/2024", "10:48:38 AM", "2024-02-01T10:48:38+00:00", PARSER_UTC),
+        ("1/31/2024", "10:48:38", "2024-01-31T10:48:38+00:00", PARSER_UTC),
+        ("31/1/2024", "10:48:38", "2024-01-31T10:48:38+00:00", PARSER_UTC),
+        ("2/1/2024", "10:48:38", "2024-02-01T10:48:38+00:00", PARSER_UTC),
+        ("2/1/2024", "10:48:38 EST", "2024-02-01T10:48:38-05:00", PARSER_UTC),
+        ("mydate", "mytime", None, PARSER_UTC),
+        ("1/2/2024", "10:48:38 AM", "2024-01-02T10:48:38-05:00", PARSER_UTC_MINUS_5),
+        ("1/31/2024", "10:48:38 AM", "2024-01-31T10:48:38-05:00", PARSER_UTC_MINUS_5),
+        ("2/1/2024", "10:48:38 AM", "2024-02-01T10:48:38-05:00", PARSER_UTC_MINUS_5),
+        ("1/31/2024", "10:48:38", "2024-01-31T10:48:38-05:00", PARSER_UTC_MINUS_5),
+        ("31/1/2024", "10:48:38", "2024-01-31T10:48:38-05:00", PARSER_UTC_MINUS_5),
+        ("2/1/2024", "10:48:38", "2024-02-01T10:48:38-05:00", PARSER_UTC_MINUS_5),
+        ("2/1/2024", "10:48:38 EST", "2024-02-01T10:48:38-05:00", PARSER_UTC_MINUS_5),
+        ("mydate", "mytime", None, PARSER_UTC),
+        ("mydate", "mytime", None, PARSER_UTC_MINUS_5),
     ],
 )
 def test_plate_number_parse_datetime(
-    date_: str, time_: str, expected: Optional[str]
+    date_: str, time_: str, expected: Optional[str], timestamp_parser: TimestampParser
 ) -> None:
     if expected:
-        datetime_ = PlateNumber._parse_datetime(date_, time_, TIMESTAMP_PARSER)
+        datetime_ = PlateNumber._parse_datetime(date_, time_, timestamp_parser)
         assert datetime_ == expected
     else:
         expected_error_message = f"Could not parse time '{date_} {time_}'"
         with pytest.raises(AllotropeConversionError, match=expected_error_message):
-            PlateNumber._parse_datetime(date_, time_, TIMESTAMP_PARSER)
+            PlateNumber._parse_datetime(date_, time_, PARSER_UTC)