diff --git a/etc/ci/performance/gecko_driver.py b/etc/ci/performance/gecko_driver.py
index 9dec4dfda3bb..99d041548cee 100644
--- a/etc/ci/performance/gecko_driver.py
+++ b/etc/ci/performance/gecko_driver.py
@@ -71,7 +71,7 @@ def generate_placeholder(testcase):
         return [timings]
 
 
-def run_gecko_test(testcase, url, timeout, is_async):
+def run_gecko_test(testcase, url, date, timeout, is_async):
     with create_gecko_session() as driver:
         driver.set_page_load_timeout(timeout)
         try:
diff --git a/etc/ci/performance/runner.py b/etc/ci/performance/runner.py
index 7b895f11ca08..e3ffe31b456b 100644
--- a/etc/ci/performance/runner.py
+++ b/etc/ci/performance/runner.py
@@ -17,7 +17,7 @@
 from urllib.parse import urlsplit, urlunsplit, urljoin
 
 
-DATE = datetime.now().strftime("%Y%m%d")
+DATE = datetime.now().strftime("%Y-%m-%d")
 MACHINE = platform.machine()
 SYSTEM = platform.system()
 
@@ -66,11 +66,11 @@ def execute_test(url, command, timeout):
     return ""
 
 
-def run_servo_test(testcase, url, timeout, is_async):
+def run_servo_test(testcase, url, date, timeout, is_async):
     if is_async:
         print("Servo does not support async test!")
         # Return a placeholder
-        return parse_log("", testcase, url)
+        return parse_log("", testcase, url, date)
 
     ua_script_path = "{}/user-agent-js".format(os.getcwd())
     command = [
@@ -92,10 +92,10 @@ def run_servo_test(testcase, url, timeout, is_async):
         ))
     except subprocess.TimeoutExpired:
         print("Test FAILED due to timeout: {}".format(testcase))
-    return parse_log(log, testcase, url)
+    return parse_log(log, testcase, url, date)
 
 
-def parse_log(log, testcase, url):
+def parse_log(log, testcase, url, date):
     blocks = []
     block = []
     copy = False
@@ -149,7 +149,7 @@ def create_placeholder(testcase):
         return {
             "system": SYSTEM,
             "machine": MACHINE,
-            "date": DATE,
+            "date": date,
             "testcase": testcase,
             "title": "",
             "navigationStart": 0,
@@ -177,15 +177,15 @@ def create_placeholder(testcase):
 
     # Set the testcase field to contain the original testcase name,
     # rather than the url.
-    def set_testcase(timing, testcase=None):
+    def set_testcase(timing, testcase=None, date=None):
         timing['testcase'] = testcase
         timing['system'] = SYSTEM
         timing['machine'] = MACHINE
-        timing['date'] = DATE
+        timing['date'] = date
         return timing
 
     valid_timing_for_case = partial(valid_timing, url=url)
-    set_testcase_for_case = partial(set_testcase, testcase=testcase)
+    set_testcase_for_case = partial(set_testcase, testcase=testcase, date=date)
     timings = list(map(set_testcase_for_case, filter(valid_timing_for_case, map(parse_block, blocks))))
 
     if len(timings) == 0:
@@ -329,6 +329,10 @@ def main():
                         default=300,  # 5 min
                         help=("kill the test if not finished in time (sec)."
                               " Default: 5 min"))
+    parser.add_argument("--date",
+                        type=str,
+                        default=None,  # 5 min
+                        help=("the date to use in the CSV file."))
     parser.add_argument("--engine",
                         type=str,
                         default='servo',
@@ -340,6 +344,7 @@ def main():
     elif args.engine == 'gecko':
         import gecko_driver  # Load this only when we need gecko test
         run_test = gecko_driver.run_gecko_test
+    date = args.date or DATE
     try:
         # Assume the server is up and running
         testcases = load_manifest(args.tp5_manifest)
@@ -352,7 +357,7 @@ def main():
                                                         url))
                 # results will be a mixure of timings dict and testcase strings
                 # testcase string indicates a failed test
-                results += run_test(testcase, url, args.timeout, is_async)
+                results += run_test(testcase, url, date, args.timeout, is_async)
                 print("Finished")
                 # TODO: Record and analyze other performance.timing properties
 
diff --git a/etc/ci/performance/test_all.sh b/etc/ci/performance/test_all.sh
index 6602bc1f20e4..e5e4f6dae08c 100755
--- a/etc/ci/performance/test_all.sh
+++ b/etc/ci/performance/test_all.sh
@@ -14,6 +14,7 @@ set -o pipefail
 # https://groups.google.com/forum/#!topic/mozilla.dev.servo/JlAZoRgcnpA
 port="8123"
 base="http://localhost:${port}"
+date="$(date +%Y-%m-%d)"
 
 while (( "${#}" ))
 do
@@ -33,6 +34,10 @@ case "${1}" in
     base="${2}"
     shift
     ;;
+  --date)
+    date="${2}"
+    shift
+    ;;
   *)
     echo "Unknown option ${1}."
     exit
@@ -56,11 +61,12 @@ trap 'kill $(jobs -pr)' SIGINT SIGTERM EXIT
 # MANIFEST="page_load_test/tp5n/20160509.manifest"
 MANIFEST="page_load_test/test.manifest" # A manifest that excludes
                                         # timeout test cases
-PERF_KEY="perf-$(uname -s)-$(uname -m)-$(date +%s).csv"
+PERF_KEY="perf-$(uname -s)-$(uname -m)-${date}.csv"
 PERF_FILE="output/${PERF_KEY}"
 
 echo "Running tests"
-python3 runner.py ${engine} --runs 4 --timeout "${timeout}" --base "${base}" \
+python3 runner.py ${engine} --runs 4 --timeout "${timeout}" \
+  --base "${base}" --date "${date}" \
   "${MANIFEST}" "${PERF_FILE}"
 
 if [[ "${submit:-}" ]];
diff --git a/python/servo/testing_commands.py b/python/servo/testing_commands.py
index e0b9a4e7b28f..de77c85c2854 100644
--- a/python/servo/testing_commands.py
+++ b/python/servo/testing_commands.py
@@ -171,9 +171,11 @@ def suite_for_path(self, path_arg):
              category='testing')
     @CommandArgument('--base', default=None,
                      help="the base URL for testcases")
+    @CommandArgument('--date', default=None,
+                     help="the datestamp for the data")
     @CommandArgument('--submit', '-a', default=False, action="store_true",
                      help="submit the data to perfherder")
-    def test_perf(self, base=None, submit=False):
+    def test_perf(self, base=None, date=None, submit=False):
         self.set_software_rendering_env(True)
 
         self.ensure_bootstrapped()
@@ -181,6 +183,8 @@ def test_perf(self, base=None, submit=False):
         cmd = ["bash", "test_perf.sh"]
         if base:
             cmd += ["--base", base]
+        if date:
+            cmd += ["--date", date]
         if submit:
             cmd += ["--submit"]
         return call(cmd,