diff --git a/.travis.yml b/.travis.yml
index 47edc3c1..fa8ccc12 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,13 +12,14 @@ env:
   matrix:
     - LUA=5.2 LUANAME=lua5.2 DO_COVERAGE=coveralls
     # Lua 5.3 isn't available in Ubuntu Trusty, so some magic below installs it.
-    - LUA=5.3 LUANAME=lua5.3 LUALIBRARY=/usr/lib/liblua.so DO_COVERAGE=codecov EXPORT_SDE=true
+    - LUA=5.3 LUANAME=lua5.3 LUALIBRARY=/usr/lib/liblua.so DO_COVERAGE=codecov
     # luajit: installed from source.
     - LUA=5.1 LUANAME=luajit-2.0 LUALIBRARY=/usr/lib/libluajit-5.1.so LUAROCKS_ARGS=--lua-suffix=jit-2.0.5 TEST_PREV_COMMITS=1
     # Note: luarocks does not work with Lua 5.0.
     - LUA=5.1 LUANAME=lua5.1 BUILD_IN_DIR=/tmp/awesome-build
     # Lua 5.2 with older lgi and screen size not divisible by 2.
-    - LUA=5.2 LUANAME=lua5.2 LGIVER=0.8.0 TESTS_SCREEN_SIZE=1921x1079 BUILD_APIDOC=true DO_CHECKQA=1 EMPTY_THEME_WHILE_LOADING=1
+    # SOURCE_DATE_EPOCH: used for stable dates during build.
+    - LUA=5.2 LUANAME=lua5.2 LGIVER=0.8.0 TESTS_SCREEN_SIZE=1921x1079 BUILD_APIDOC=true DO_CHECKQA=1 EMPTY_THEME_WHILE_LOADING=1 SOURCE_DATE_EPOCH=1893456000
   global:
     # Secure GH_APIDOC_TOKEN to push to awesomeWM/apidoc.
     - secure: "R/HYDclnws1I1+v9Yjt+RKa4CsFhbBT9tiwE3EfPhEj2KCYX4sFRMxuZvLf5sq0XWdrQaPhQ54fgAZGr3f054JKRXcTB0g9J6nhSHz9kIjPh446gafUhEeDQcZRwM/MeCWiwFIkiZm6smYoDFE9JTWu6quNV+lQ4kcVDOp2ibEc="
@@ -156,7 +157,6 @@ install:
     }
 script:
   - export CMAKE_ARGS="-DLUA_LIBRARY=${LUALIBRARY} -DLUA_INCLUDE_DIR=${LUAINCLUDE} -D OVERRIDE_VERSION=$AWESOME_VERSION -DSTRICT_TESTS=true -D DO_COVERAGE=$DO_COVERAGE"
-  - if [ "$EXPORT_SDE" = "true" ]; then export SOURCE_DATE_EPOCH=$(date -u -r docs/89-NEWS.md +%s); fi
   - |
     if [ "$EMPTY_THEME_WHILE_LOADING" = 1 ]; then
       # Break beautiful so that trying to access the theme before beautiful.init() causes an error