diff --git a/README.md b/README.md
index 28b6e12..938e5cb 100644
--- a/README.md
+++ b/README.md
@@ -76,7 +76,12 @@ See [`sample/event/index.md`](sample/event/index.md) for an example event. Event
 
 ### Notes on dates
 
-Dates must be of HTML format, see [here](https://developer.mozilla.org/en-US/docs/Web/HTML/Date_and_time_formats#examples) for examples.
+Dates must be of ISO 8601 format, see [here](https://github.com/moment/luxon/blob/master/docs/parsing.md#iso-8601) for full examples, or below:
+
+```
+2016-05-25
+2016-05-25T09:24
+```
 
 Either `end` or `duration` is required, but not both. However, if both are provided, `end` prevails on `duration`.
 
diff --git a/calendar.js b/calendar.js
index 6d190ba..7c5575a 100644
--- a/calendar.js
+++ b/calendar.js
@@ -42,6 +42,8 @@ const eventToJsonEvent = (event, options = {}) => {
     }
     return {
         ...time,
+        startInputType: "utc",
+        endInputType: "utc",
         ...{
             title: event.data?.title,
             description: event.data?.description,
diff --git a/package-lock.json b/package-lock.json
index 3347067..8cc6a1b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -308,12 +308,12 @@
       }
     },
     "node_modules/braces": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
-      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.3.tgz",
+      "integrity": "sha512-yQbXgO/OSZVD2IsiLlro+7Hf6Q18EJrKSEsdoMzKePKXct3gvD8oLcOQdIzGupr5Fj+EDe8gO/lxc1BzfMpxvA==",
       "dev": true,
       "dependencies": {
-        "fill-range": "^7.0.1"
+        "fill-range": "^7.1.1"
       },
       "engines": {
         "node": ">=8"
@@ -803,9 +803,9 @@
       }
     },
     "node_modules/fill-range": {
-      "version": "7.0.1",
-      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
-      "integrity": "sha512-qOo9F+dMUmC2Lcb4BbVvnKJxTPjCm+RRpe4gDuGrzkL7mEVl/djYSu2OdQ2Pa302N4oqkSg9ir6jaLWJ2USVpQ==",
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.1.1.tgz",
+      "integrity": "sha512-YsGpe3WHLK8ZYi4tWDg2Jy3ebRz2rXowDxnld4bkQB00cc/1Zw9AWnC0i9ztDJitivtQvaI9KaLyKrc+hBW0yg==",
       "dev": true,
       "dependencies": {
         "to-regex-range": "^5.0.1"