diff --git a/esphome/components/web_server/web_server.cpp b/esphome/components/web_server/web_server.cpp
index 87f0827284..de4da99e00 100644
--- a/esphome/components/web_server/web_server.cpp
+++ b/esphome/components/web_server/web_server.cpp
@@ -1181,7 +1181,7 @@ void WebServer::handle_date_request(AsyncWebServerRequest *request, const UrlMat
       request->send(409);
       return;
     }
-    call.set_date(value);
+    call.set_date(value.c_str(), value.size());
 
     DEFER_ACTION(call, call.perform());
     request->send(200);
@@ -1242,7 +1242,7 @@ void WebServer::handle_time_request(AsyncWebServerRequest *request, const UrlMat
       request->send(409);
       return;
     }
-    call.set_time(value);
+    call.set_time(value.c_str(), value.size());
 
     DEFER_ACTION(call, call.perform());
     request->send(200);
@@ -1302,7 +1302,7 @@ void WebServer::handle_datetime_request(AsyncWebServerRequest *request, const Ur
       request->send(409);
       return;
     }
-    call.set_datetime(value);
+    call.set_datetime(value.c_str(), value.size());
 
     DEFER_ACTION(call, call.perform());
     request->send(200);