Resolve "Absence user: add end date"

src/Bundle/ChillMainBundle/Resources/public/chill/js/date.ts

@@ -37,8 +37,13 @@ export const ISOToDate = (str: string | null): Date | null => {
         return null;
     }
 
-    const [year, month, day] = str.split("-").map((p) => parseInt(p));
+    // If the string already contains time info, use it directly
+    if (str.includes("T") || str.includes(" ")) {
+        return new Date(str);
+    }
 
+    // Otherwise, parse date only
+    const [year, month, day] = str.split("-").map((p) => parseInt(p));
     return new Date(year, month - 1, day, 0, 0, 0, 0);
 };
 
@@ -69,20 +74,19 @@ export const ISOToDatetime = (str: string | null): Date | null => {
  *
  */
 export const datetimeToISO = (date: Date): string => {
-    let cal, time, offset;
-    cal = [
+    const cal = [
         date.getFullYear(),
         (date.getMonth() + 1).toString().padStart(2, "0"),
         date.getDate().toString().padStart(2, "0"),
     ].join("-");
 
-    time = [
+    const time = [
         date.getHours().toString().padStart(2, "0"),
         date.getMinutes().toString().padStart(2, "0"),
         date.getSeconds().toString().padStart(2, "0"),
     ].join(":");
 
-    offset = [
+    const offset = [
         date.getTimezoneOffset() <= 0 ? "+" : "-",
         Math.abs(Math.floor(date.getTimezoneOffset() / 60))
             .toString()