diff --git a/.github/workflows/apidoc.yml b/.github/workflows/apidoc.yml
index ef141868..d651403e 100644
--- a/.github/workflows/apidoc.yml
+++ b/.github/workflows/apidoc.yml
@@ -21,6 +21,10 @@ jobs:
   main:
     runs-on: ubuntu-20.04
 
+    env:
+      # Used for stable dates in documentation examples. See #2070.
+      SOURCE_DATE_EPOCH: "1893456000"
+
     steps:
       # Create a cache invalidation key based on the current year + week.
       # This way, packages will be checked for updates once every week.
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9d594ed3..d0fe4b82 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -59,8 +59,6 @@ jobs:
             tests_screen_size: "1921x1079"
             check_qa: true
             empty_theme_while_loading: true
-            # SOURCE_DATE_EPOCH: used for stable dates during build.
-            source_date_epoch: "1893456000"
             test_prev_commits: true
 
     env:
@@ -68,7 +66,6 @@ jobs:
       LUAINCLUDE: ${{ matrix.lua_include || format('/usr/include/lua{0}', matrix.lua_version) }}
       LUALIBRARY: ${{ matrix.lua_library || format('/usr/lib/x86_64-linux-gnu/liblua{0}.so', matrix.lua_version) }}
       TESTS_SCREEN_SIZE: ${{ matrix.tests_screen_size }}
-      SOURCE_DATE_EPOCH: ${{ matrix.source_date_epoch }}
       TEST_TIMEOUT: '100'
       CI: 'true'