Use UTC time for server stats history, localize times on the client

locust/stats.py

@@ -791,7 +791,7 @@ def stats_history(runner):
             break
         if runner.state != "stopped":
             r = {
-                "time": datetime.datetime.now().strftime("%H:%M:%S"),
+                "time": datetime.datetime.utcnow().strftime("%H:%M:%S"),
                 "current_rps": stats.total.current_rps or 0,
                 "current_fail_per_sec": stats.total.current_fail_per_sec or 0,
                 "response_time_percentile_95": stats.total.get_current_response_time_percentile(0.95) or 0,

locust/templates/report.html

@@ -44,7 +44,7 @@ <h1>Locust Test Report</h1>
             {% if show_download_link %}
                 <p class="download"><a href="?download=1">Download the Report</a></p>
             {% endif %}
-            <p>During: <span>{{ start_time }} - {{ end_time }}</span></p>
+            <p>During: <span class="l10n datetime">{{ start_time }}</span> - <span class="l10n datetime">{{ end_time }}</span></p>
             <p>Target Host: <span>{{ host }}</span></p>
         </div>
 
@@ -219,6 +219,14 @@ <h2>Charts</h2>
                 ]
             });
         }
+
+        $(".l10n.datetime").html((index, currentContent) => {
+            if (!currentContent || !currentContent.includes(" ") || !currentContent.includes(":")) {
+                return currentContent;
+            }
+
+            return new Date(Date.parse(currentContent.replace(" ", "T") + ".000Z")).toLocaleString();
+        });
     </script>
 </body>
 </html>

locust/templates/stats_data.html

@@ -1,6 +1,6 @@
 {% set time_data = [] %}{% set user_count_data = [] %}{% set current_rps_data = [] %}{% set current_fail_per_sec_data = [] %}{% set response_time_percentile_50_data = [] %}{% set response_time_percentile_95_data = [] %}{% for r in history %}{% do time_data.append(r.time) %}{% do user_count_data.append({"value": r.user_count}) %}{% do current_rps_data.append({"value": r.current_rps, "users": r.user_count}) %}{% do current_fail_per_sec_data.append({"value": r.current_fail_per_sec, "users": r.user_count}) %}{% do response_time_percentile_50_data.append({"value": r.response_time_percentile_50, "users": r.user_count}) %}{% do response_time_percentile_95_data.append({"value": r.response_time_percentile_95, "users": r.user_count}) %}{% endfor %}
 var stats_history = {
-    "time": {{ time_data | tojson }},
+    "time": {{ time_data | tojson }}.map(server_time => new Date(new Date().setUTCHours(...(server_time.split(":")))).toLocaleTimeString()),
     "user_count": {{ user_count_data | tojson }},
     "current_rps": {{ current_rps_data | tojson }},
     "current_fail_per_sec": {{ current_fail_per_sec_data | tojson }},