diff --git a/classes/systimemgrconfig.bbclass b/classes/systimemgrconfig.bbclass
new file mode 100644
index 00000000..1cb70d11
--- /dev/null
+++ b/classes/systimemgrconfig.bbclass
@@ -0,0 +1,61 @@
+# Generates /etc/systimemgr.conf based on active override.
+#
+# Supported overrides:
+#   - ntp-dtt-rdkdefault
+#   - ntp-dtt-drm-tee
+
+python create_systimemgrconfig() {
+    import os
+
+    overrides = (d.getVar("OVERRIDES", True) or "").split(":")
+    rootfs_dir = d.getVar("IMAGE_ROOTFS", True)
+
+    content = None
+    remove_secure_conf = False
+
+    if "ntp-dtt-drm-tee" in overrides:
+        content = """timesrc  ntp /ntp
+timesrc dtt /dtt
+timesrc drm /drm
+timesync tee /tee
+"""
+        remove_secure_conf = True
+    elif "ntp-dtt-rdkdefault" in overrides:
+        content = """timesrc  ntp /ntp
+timesrc dtt /dtt
+timesync rdkdefault /clock_time
+"""
+
+    if content is None:
+        bb.note("No supported systimemgr override active; skipping systimemgr.conf generation")
+        return
+
+    dest_dir = os.path.join(rootfs_dir, "etc")
+    os.makedirs(dest_dir, exist_ok=True)
+
+    dest_path = os.path.join(dest_dir, "systimemgr.conf")
+    with open(dest_path, "w", encoding="utf-8") as f:
+        f.write(content)
+
+    os.chmod(dest_path, 0o644)
+
+    if remove_secure_conf:
+        secure_conf = os.path.join(
+            rootfs_dir,
+            "lib",
+            "systemd",
+            "system",
+            "systimemgr.service.d",
+            "secure.conf"
+        )
+
+        if os.path.exists(secure_conf):
+            os.remove(secure_conf)
+
+        service_dir = os.path.dirname(secure_conf)
+        if os.path.isdir(service_dir) and not os.listdir(service_dir):
+            os.rmdir(service_dir)
+}
+
+create_systimemgrconfig[vardepsexclude] += "DATETIME"
+ROOTFS_POSTPROCESS_COMMAND += 'create_systimemgrconfig; '
diff --git a/conf/include/image-classes.inc b/conf/include/image-classes.inc
index 99f81836..1bb354ed 100644
--- a/conf/include/image-classes.inc
+++ b/conf/include/image-classes.inc
@@ -25,3 +25,6 @@ IMAGE_CLASSES += "mediariteproductconfig"
 
 # /etc/rfcdefaults/socprovisioning.ini
 IMAGE_CLASSES += "socprovisioning-config"
+
+#/etc/systimemgr.conf
+IMAGE_CLASSES += "systimemgrconfig"