diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..82a5fff
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,11 @@
+{
+    "env": {
+        "node": true
+    },
+    "parserOptions": {
+        "ecmaVersion": 7,
+        "sourceType": "module"
+
+    },
+    "extends": "eslint:recommended"
+}
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..be3ea71
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,16 @@
+# CHANGELOG
+
+## v1.1.0
+
+### Changes
+
+* level parameter is now optional for `logExpression`. If omitted, will always log regardless of level.
+
+### Bugfixes
+
+* Fix month being off by one in timestamp.
+* Fix typo in function name in type definition for `setLogLevel`.
+
+## v1.0.0
+
+* Initial Release
\ No newline at end of file
diff --git a/logger.d.ts b/logger.d.ts
index 61ab080..668cdc6 100644
--- a/logger.d.ts
+++ b/logger.d.ts
@@ -1,2 +1,2 @@
-declare function logLevel(level: number): void;
-declare function logExpression(msg: any, level: number): void;
+declare function setlogLevel(level: number): void;
+declare function logExpression(msg: any, level?: number): void;
diff --git a/logger.js b/logger.js
index 1999c26..2f95672 100644
--- a/logger.js
+++ b/logger.js
@@ -13,14 +13,14 @@ module.exports.setLogLevel = (level) => {
  * Log an expression to console at a specific level.
  *
  * @param {any} msg
- * @param {number} level
+ * @param {number} [level]
  */
 module.exports.logExpression = (msg, level) => {
-  if (level > logLevel) {
+  if (level !== undefined && level > logLevel) {
     return;
   }
   const now = new Date();
-  const date = [now.getFullYear(), now.getMonth(), now.getDate()].map((val) => val.toString().padStart(2, '0')).join('-');
+  const date = [now.getFullYear(), now.getMonth() + 1, now.getDate()].map((val) => val.toString().padStart(2, '0')).join('-');
   const time = [now.getHours(), now.getMinutes(), now.getSeconds()].map((val) => val.toString().padStart(2, '0')).join(':');
   const datetime = `[${date} ${time}.${now.getMilliseconds().toString().padStart(3, '0').substr(0, 2)}]`;
   if (typeof msg === 'object') {
diff --git a/package-lock.json b/package-lock.json
index ddbef43..e51cb7d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,5 +1,1090 @@
 {
-  "name": "zepto-logger",
-  "version": "1.0.0",
-  "lockfileVersion": 1
+  "name": "@cisl/zepto-logger",
+  "version": "1.1.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.8.3"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.8.3.tgz",
+      "integrity": "sha512-PX4y5xQUvy0fnEVHrYOarRPXVWafSjTW9T0Hab8gVIawpl2Sj0ORyrygANq+KjcNlSSTw0YCLSNA8OyZ1I4yEg==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@types/color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
+      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
+      "dev": true
+    },
+    "acorn": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
+      "integrity": "sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.2.0.tgz",
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+      "dev": true
+    },
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.0.tgz",
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diff --git a/package.json b/package.json
index e7962d5..a58afc8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@cisl/zepto-logger",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "A tiny logger utility library",
   "main": "logger.js",
   "types": "logger.d.ts",
@@ -17,5 +17,11 @@
     "url": "https://github.com/cislrpi/zepto-logger/issues"
   },
   "homepage": "https://github.com/cislrpi/zepto-logger#readme",
-  "dependencies": {}
+  "scripts": {
+    "lint": "eslint logger.js"
+  },
+  "dependencies": {},
+  "devDependencies": {
+    "eslint": "^6.8.0"
+  }
 }