--- a/configs/builds/branch_specifics.py
+++ b/configs/builds/branch_specifics.py
@@ -104,25 +104,46 @@ config = {
         'repo_path': 'integration/mozilla-inbound',
     },
     'services-central': {
         'repo_path': 'services/services-central',
     },
     'ux': {
         "graph_server_branch_name": "UX",
     },
+    # When build promotion goes live the mozconfig changes are probably better
+    # expressed once in files like configs/builds/releng_base_windows_32_builds.py
+    'date': {
+        'enable_release_promotion': 1,
+        'platform_overrides': {
+            'linux': {
+                'src_mozconfig': 'browser/config/mozconfigs/linux32/beta',
+            },
+            'linux64': {
+                'src_mozconfig': 'browser/config/mozconfigs/linux64/beta',
+            },
+            'macosx64': {
+                'src_mozconfig': 'browser/config/mozconfigs/macosx-universal/beta',
+            },
+            'win32': {
+                'src_mozconfig': 'browser/config/mozconfigs/win32/beta',
+            },
+            'win64': {
+                'src_mozconfig': 'browser/config/mozconfigs/win64/beta',
+            },
+        },
+    },
 
     ### other branches that do not require anything special:
     # 'alder': {},
     # 'ash': {},
     # 'birch': {},
     # 'build-system': {}
     # 'cedar': {},
     # "cypress": {},
-    # 'date': {},
     # 'elm': {},
     # 'fig': {},
     # 'graphics': {}
     # 'holly': {},
     # 'jamun': {},
     # 'larch': {},
     # 'maple': {},
     # 'oak': {},

--- a/mozharness/mozilla/building/buildbase.py
+++ b/mozharness/mozilla/building/buildbase.py
@@ -756,16 +756,20 @@ or run without that action (ie: --no-{ac
         if c.get('enable_signing'):
             moz_sign_cmd = subprocess.list2cmdline(
                 self.query_moz_sign_cmd(formats=None)
             )
             # windows fix. This is passed to mach build env and we call that
             # with python, not with bash so we need to fix the slashes here
             env['MOZ_SIGN_CMD'] = moz_sign_cmd.replace('\\', '\\\\\\\\')
 
+        # to activate the right behaviour in mozonfigs while we transition
+        if c.get('enable_release_promotion'):
+            env['ENABLE_RELEASE_PROMOTION'] = "1"
+
         # we can't make env an attribute of self because env can change on
         # every call for reasons like MOZ_SIGN_CMD
         return env
 
     def query_mach_build_env(self):
         c = self.config
         mach_env = {}
         if c.get('upload_env'):