From 3bdbcb2951219112bbbe8209aecad4f06179555f Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <256895@studenti.unimore.it>
Date: Fri, 7 May 2021 04:47:48 +0200
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20Create=20convertToLocalISODate=20fu?=
 =?UTF-8?q?nction?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/utils/convertToLocalISODate.js        | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 code/frontend/src/utils/convertToLocalISODate.js

diff --git a/code/frontend/src/utils/convertToLocalISODate.js b/code/frontend/src/utils/convertToLocalISODate.js
new file mode 100644
index 0000000..bfc583a
--- /dev/null
+++ b/code/frontend/src/utils/convertToLocalISODate.js
@@ -0,0 +1,30 @@
+// Wow, JS, davvero?
+// Davvero tutte le date.toISOString() sono considerate UTC?
+// Wow.
+
+/**
+ * Convert a {@link Date} object to a timezone aware ISO String, using the user's local timezone.
+ *
+ * @param date
+ * @returns {string}
+ */
+export default function convertToLocalISODate(date) {
+    if(date.toString() === "Invalid Date") {
+        throw new Error("Received an Invalid Date as parameter.")
+    }
+
+    // Create a timezone naive ISO string
+    const naive = date.toISOString()
+
+    // Find the local timezone
+    const tz = - new Date().getTimezoneOffset()
+
+    // Convert the timezone to hours
+    const tzHours = Math.abs(Math.floor(tz / 60)).toString().padStart(2, "0")
+
+    // Find the minutes
+    const tzMinutes = (tz % 60).toString().padStart(2, "0")
+
+    // Replace the naive part with the aware part
+    return naive.replace("Z", `${tz < 0 ? "-" : "+"}${tzHours}${tzMinutes}`)
+}
\ No newline at end of file