diff --git a/apps/predbat/tests/test_web_functions.py b/apps/predbat/tests/test_web_functions.py
index daf52ef57..7a7fd7753 100644
--- a/apps/predbat/tests/test_web_functions.py
+++ b/apps/predbat/tests/test_web_functions.py
@@ -155,6 +155,23 @@ def set_exporting(on):
 
     my_predbat.dashboard_index = original_dashboard_index
 
+    # -------------------------------------------------------------------------
+    # Last Started/Last Updated date format consistency (issue #4223)
+    print("Test: Last Started date is displayed in the same format as Last Updated")
+    status_entity = prefix + ".status"
+    last_started_entity = prefix + ".last_started"
+    set_entity(my_predbat, status_entity, state="Idle", last_updated="2026-07-10 14:40:10.512590")
+    set_entity(my_predbat, last_started_entity, state="2026-07-10T01:10:39+0100")
+    my_predbat.dashboard_index = [status_entity]
+    status_html = web.get_status_html("1.0")
+    my_predbat.dashboard_index = original_dashboard_index
+    if "2026-07-10 01:10:39" not in status_html:
+        print(f"  ERROR: expected 'Last Started' to be reformatted without 'T'/timezone offset, got: {status_html}")
+        failed += 1
+    if "2026-07-10T01:10:39+0100" in status_html:
+        print(f"  ERROR: 'Last Started' should not show the raw stored ISO format, got: {status_html}")
+        failed += 1
+
     # -------------------------------------------------------------------------
     # Currency unit display in the web config pages (issue #4071)
     # The web UI must show the user's configured currency symbol, not the raw "p".
diff --git a/apps/predbat/web.py b/apps/predbat/web.py
index 073d9ac0f..6e88c2d02 100644
--- a/apps/predbat/web.py
+++ b/apps/predbat/web.py
@@ -582,6 +582,11 @@ def get_status_html(self, version):
             text += "<tr><td>Status</td><td{}>{}</td></tr>\n".format(debug_title, status_full)
         text += "<tr><td>Last Updated</td><td>{}</td></tr>\n".format(last_updated)
         last_started = self.get_state_wrapper(self.prefix + ".last_started", default=None)
+        if last_started:
+            try:
+                last_started = str2time(last_started).replace(tzinfo=None)
+            except (ValueError, TypeError) as e:
+                self.log("Warn: Failed to parse last_started time {}: {}".format(last_started, e))
         text += "<tr><td>Last Started</td><td>{}</td></tr>\n".format(last_started)
         text += "<tr><td>Version</td><td>{}</td></tr>\n".format(version)