diff --git a/.editorconfig b/.editorconfig
index 7c06305..d82aca8 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -10,5 +10,9 @@ charset = utf-8
 indent_style = space
 indent_size = 2
 
+[*.rockspec]
+indent_style = space
+indent_size = 2
+
 [Makefile]
 indent_style = tab
diff --git a/.luacheckrc b/.luacheckrc
index c4a9f82..6a352c8 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -21,11 +21,15 @@ ignore = {
     --"6.", -- ignore whitespace warnings
 }
 
+include_files = {
+    "**/*.lua",
+    "*.rockspec",
+    ".busted",
+    ".luacheckrc",
+}
 
 exclude_files = {
     "here/**",
     "samples/**",
-    --"spec/fixtures/invalid-module.lua",
-    --"spec-old-api/fixtures/invalid-module.lua",
 }
 
diff --git a/README.md b/README.md
index 6556a0b..9b2186c 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,7 @@ Tests are located in the `spec` directory and can be run using [busted](http://o
 
 ## Changes:
 
+- v2.2 add 'centuryflip' to set 2 digit year interpretation [#26](https://github.com/Tieske/date/pull/26)
 - v2.1.3 fix rockspec for Lua 5.4
 - v2.1.2 fix scientific notation [#9](https://github.com/Tieske/date/pull/9), now available for Lua 5.3
 - v2.1.1 fix for '>=' operator [#3](https://github.com/Tieske/date/pull/3), added test suite, added Travis CI, license MIT
diff --git a/date-2.1.3-1.rockspec b/date-2.1.3-1.rockspec
deleted file mode 100644
index 484b8f3..0000000
--- a/date-2.1.3-1.rockspec
+++ /dev/null
@@ -1,31 +0,0 @@
-package = "date"
-version = "2.1.3-1"
-
-description = {
-   summary = "Date & Time module for Lua 5.x",
-   detailed = [[
-      Pure Lua Date & Time module for Lua 5.x featuring date and time string
-      parsing, time addition & subtraction, time span calculation, support for
-      ISO 8601 dates, local time support, strftime-like formatting.
-   ]],
-   license = "MIT",
-   homepage = "https://github.com/Tieske/date",
-}
-
-dependencies = {
-   "lua >= 5.0, < 5.5"
-}
-
-source = {
-   url = "git://github.com/Tieske/date/",
-   tag = "version_2.1.3",
-}
-
-build = {
-   type = "builtin",
-   modules = {
-      date = "src/date.lua"
-   },
-   copy_directories = { "docs" },
-}
-
diff --git a/date-2.2-1.rockspec b/date-2.2-1.rockspec
new file mode 100644
index 0000000..3409cd1
--- /dev/null
+++ b/date-2.2-1.rockspec
@@ -0,0 +1,37 @@
+local package_name = "date"
+local package_version = "2.2"
+local rockspec_revision = "1"
+local github_account_name = "Tieske"
+local github_repo_name = package_name
+local git_checkout = package_version == "dev" and "master" or ("version_"..package_version)
+
+package = package_name
+version = package_version .. "-" .. rockspec_revision
+
+source = {
+  url = "git://github.com/"..github_account_name.."/"..github_repo_name..".git",
+  branch = git_checkout
+}
+
+description = {
+  summary = "Date & Time module for Lua 5.x",
+  detailed = [[
+    Pure Lua Date & Time module for Lua 5.x featuring date and time string
+    parsing, time addition & subtraction, time span calculation, support for
+    ISO 8601 dates, local time support, strftime-like formatting.
+  ]],
+  license = "MIT",
+  homepage = "https://github.com/"..github_account_name.."/"..github_repo_name,
+}
+
+dependencies = {
+  "lua >= 5.0, < 5.5"
+}
+
+build = {
+  type = "builtin",
+  modules = {
+    date = "src/date.lua"
+  },
+  copy_directories = { "docs" },
+}