diff --git a/src/dcqc/tests/tiff_tag_306_date_time_test.py b/src/dcqc/tests/tiff_tag_306_date_time_test.py
index 3ae3443..5ec5d67 100644
--- a/src/dcqc/tests/tiff_tag_306_date_time_test.py
+++ b/src/dcqc/tests/tiff_tag_306_date_time_test.py
@@ -14,11 +14,12 @@ def generate_process(self) -> Process:
             "tifftools",
             "dump",
             f"'{path.name}'",
+            "--json",
+            "--silent",
             "|",
-            "grep",  # pipe the output
-            "-a",  # treat input as text
-            "-q",  # suppress output
-            "'DateTime 306 (0x132) ASCII'",  # match the DateTime 306 tag
+            "jq",
+            "-e",
+            "'.[].ifds[].tags[\"306\"]'",
         ]
         process = Process(
             container="ghcr.io/sage-bionetworks-workflows/tifftools:latest",
diff --git a/tests/test_tests.py b/tests/test_tests.py
index efbbfac..6d8fb6e 100644
--- a/tests/test_tests.py
+++ b/tests/test_tests.py
@@ -267,7 +267,7 @@ def test_that_the_tifftag306datetimetest_command_is_produced(test_targets):
     target = test_targets["tiff"]
     test = tests.TiffTag306DateTimeTest(target)
     process = test.generate_process()
-    assert "grep" in process.command
+    assert "jq" in process.command
 
 
 def test_that_the_tifftag306datetimetest_correctly_interprets_exit_code_0_and_1(