diff --git a/core/frontend/apps/private-blogging/lib/middleware.js b/core/frontend/apps/private-blogging/lib/middleware.js
index 09a4df313c..1e40a66fa1 100644
--- a/core/frontend/apps/private-blogging/lib/middleware.js
+++ b/core/frontend/apps/private-blogging/lib/middleware.js
@@ -5,7 +5,7 @@ const crypto = require('crypto');
 const path = require('path');
 const config = require('../../../../shared/config');
 const urlUtils = require('../../../../shared/url-utils');
-const constants = require('../../../../server/lib/constants');
+const constants = require('@tryghost/constants');
 const {i18n} = require('../../../../server/lib/common');
 const errors = require('@tryghost/errors');
 const settingsCache = require('../../../../server/services/settings/cache');
diff --git a/core/server/adapters/storage/LocalFileStorage.js b/core/server/adapters/storage/LocalFileStorage.js
index a6797ac699..1dec2d1267 100644
--- a/core/server/adapters/storage/LocalFileStorage.js
+++ b/core/server/adapters/storage/LocalFileStorage.js
@@ -10,7 +10,7 @@ const config = require('../../../shared/config');
 const {i18n} = require('../../lib/common');
 const logging = require('../../../shared/logging');
 const errors = require('@tryghost/errors');
-const constants = require('../../lib/constants');
+const constants = require('@tryghost/constants');
 const urlUtils = require('../../../shared/url-utils');
 const StorageBase = require('ghost-storage-base');
 
diff --git a/core/server/lib/constants.js b/core/server/lib/constants.js
deleted file mode 100644
index 28a5912180..0000000000
--- a/core/server/lib/constants.js
+++ /dev/null
@@ -1,14 +0,0 @@
-module.exports = {
-    ONE_HOUR_S: 3600,
-    ONE_DAY_S: 86400,
-    ONE_MONTH_S: 2628000,
-    SIX_MONTH_S: 15768000,
-    ONE_YEAR_S: 31536000,
-    FIVE_MINUTES_MS: 300000,
-    ONE_HOUR_MS: 3600000,
-    ONE_DAY_MS: 86400000,
-    ONE_WEEK_MS: 604800000,
-    ONE_MONTH_MS: 2628000000,
-    SIX_MONTH_MS: 15768000000,
-    ONE_YEAR_MS: 31536000000
-};
diff --git a/core/server/models/invite.js b/core/server/models/invite.js
index 31eb76fd29..9f235ae11b 100644
--- a/core/server/models/invite.js
+++ b/core/server/models/invite.js
@@ -2,7 +2,7 @@ const Promise = require('bluebird');
 const _ = require('lodash');
 const {i18n} = require('../lib/common');
 const errors = require('@tryghost/errors');
-const constants = require('../lib/constants');
+const constants = require('@tryghost/constants');
 const security = require('../lib/security');
 const settingsCache = require('../services/settings/cache');
 const ghostBookshelf = require('./base');
diff --git a/core/server/services/auth/passwordreset.js b/core/server/services/auth/passwordreset.js
index 52d2b71bc9..e9d435343d 100644
--- a/core/server/services/auth/passwordreset.js
+++ b/core/server/services/auth/passwordreset.js
@@ -1,6 +1,6 @@
 const _ = require('lodash');
 const security = require('../../lib/security');
-const constants = require('../../lib/constants');
+const constants = require('@tryghost/constants');
 const errors = require('@tryghost/errors');
 const {i18n} = require('../../lib/common');
 const models = require('../../models');
diff --git a/core/server/services/auth/session/express-session.js b/core/server/services/auth/session/express-session.js
index ef570892de..36b8780951 100644
--- a/core/server/services/auth/session/express-session.js
+++ b/core/server/services/auth/session/express-session.js
@@ -1,5 +1,5 @@
 const session = require('express-session');
-const constants = require('../../../lib/constants');
+const constants = require('@tryghost/constants');
 const config = require('../../../../shared/config');
 const settingsCache = require('../../settings/cache');
 const models = require('../../../models');
diff --git a/core/server/web/admin/app.js b/core/server/web/admin/app.js
index dfda36c41b..d1b07b4eb9 100644
--- a/core/server/web/admin/app.js
+++ b/core/server/web/admin/app.js
@@ -2,7 +2,7 @@ const debug = require('ghost-ignition').debug('web:admin:app');
 const express = require('../../../shared/express');
 const serveStatic = express.static;
 const config = require('../../../shared/config');
-const constants = require('../../lib/constants');
+const constants = require('@tryghost/constants');
 const urlUtils = require('../../../shared/url-utils');
 const shared = require('../shared');
 const adminMiddleware = require('./middleware');
diff --git a/core/server/web/api/middleware/update-user-last-seen.js b/core/server/web/api/middleware/update-user-last-seen.js
index 837b883d15..2ff867e5d0 100644
--- a/core/server/web/api/middleware/update-user-last-seen.js
+++ b/core/server/web/api/middleware/update-user-last-seen.js
@@ -1,4 +1,4 @@
-const constants = require('../../../lib/constants');
+const constants = require('@tryghost/constants');
 
 module.exports = function updateUserLastSeenMiddleware(req, res, next) {
     if (!req.user) {
diff --git a/core/server/web/site/app.js b/core/server/web/site/app.js
index 43da6f1558..509e930747 100644
--- a/core/server/web/site/app.js
+++ b/core/server/web/site/app.js
@@ -7,7 +7,7 @@ const errors = require('@tryghost/errors');
 
 // App requires
 const config = require('../../../shared/config');
-const constants = require('../../lib/constants');
+const constants = require('@tryghost/constants');
 const storage = require('../../adapters/storage');
 const urlService = require('../../../frontend/services/url');
 const urlUtils = require('../../../shared/url-utils');
diff --git a/core/server/web/site/middleware/static-theme.js b/core/server/web/site/middleware/static-theme.js
index e9ea41e1f2..f7de8ef0d9 100644
--- a/core/server/web/site/middleware/static-theme.js
+++ b/core/server/web/site/middleware/static-theme.js
@@ -1,6 +1,6 @@
 const path = require('path');
 const config = require('../../../../shared/config');
-const constants = require('../../../lib/constants');
+const constants = require('@tryghost/constants');
 const themeUtils = require('../../../../frontend/services/themes');
 const express = require('../../../../shared/express');
 
diff --git a/package.json b/package.json
index 8dd77f78c5..f46fee5bf5 100644
--- a/package.json
+++ b/package.json
@@ -44,6 +44,7 @@
     "@sentry/node": "5.20.1",
     "@tryghost/adapter-manager": "0.1.9",
     "@tryghost/bootstrap-socket": "0.2.0",
+    "@tryghost/constants": "0.1.0",
     "@tryghost/errors": "0.2.2",
     "@tryghost/helpers": "1.1.29",
     "@tryghost/image-transform": "1.0.2",
diff --git a/test/unit/web/api/middleware/update-user-last-seen_spec.js b/test/unit/web/api/middleware/update-user-last-seen_spec.js
index 7abd3dc993..d67d8eae14 100644
--- a/test/unit/web/api/middleware/update-user-last-seen_spec.js
+++ b/test/unit/web/api/middleware/update-user-last-seen_spec.js
@@ -1,6 +1,6 @@
 const should = require('should');
 const sinon = require('sinon');
-const constants = require('../../../../../core/server/lib/constants');
+const constants = require('@tryghost/constants');
 const updateUserLastSeenMiddleware = require('../../../../../core/server/web/api/middleware/update-user-last-seen');
 
 describe('updateUserLastSeenMiddleware', function () {
diff --git a/test/utils/fixtures/data-generator.js b/test/utils/fixtures/data-generator.js
index 4c8a1c1ad8..5c8f7da3ec 100644
--- a/test/utils/fixtures/data-generator.js
+++ b/test/utils/fixtures/data-generator.js
@@ -2,7 +2,7 @@ const _ = require('lodash');
 const uuid = require('uuid');
 const ObjectId = require('bson-objectid');
 const moment = require('moment');
-const constants = require('../../../core/server/lib/constants');
+const constants = require('@tryghost/constants');
 const DataGenerator = {};
 
 DataGenerator.markdownToMobiledoc = function markdownToMobiledoc(content) {
diff --git a/yarn.lock b/yarn.lock
index 72e48e5d29..3ebe3697a9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -302,6 +302,11 @@
   resolved "https://registry.yarnpkg.com/@tryghost/bootstrap-socket/-/bootstrap-socket-0.2.0.tgz#efc7291b346b633117d8d5e0fca7e52c6913a9f2"
   integrity sha512-Ao9REMMiorIdEtVDkS0xdCnnvwQU9zd3bsz7521RCeDBT3pi5AbrFrV9LwG+XnCgw9NvbmTv0aidxpiEQV1aSQ==
 
+"@tryghost/constants@0.1.0":
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/@tryghost/constants/-/constants-0.1.0.tgz#a92b0d7f9f82d6a5fb44efb41b03d7f57b37309b"
+  integrity sha512-QFRiCW9cgrYEtQXaLdhKwylg/WoeVy3ZPFfCIQv0R7i5f6ycyW+2N1t4ZsnEFiuCw9Fvphwodr2QgHrQaiOCpg==
+
 "@tryghost/errors@0.2.2", "@tryghost/errors@^0.2.2":
   version "0.2.2"
   resolved "https://registry.yarnpkg.com/@tryghost/errors/-/errors-0.2.2.tgz#ff70a5f895c84b84c47d71b9a16cba55c52f89ff"