🐛 Fix issues with UTC time handling

- Using `.setUTCHours` can cause the day to shift at specific times

src/util.js

@@ -1,7 +1,4 @@
-import { classFilter } from "@/store";
-
-export function getSubstitutionText(substitution) {
-  const includeClass = !classFilter.value || classFilter.value == "none";
+export function getSubstitutionText(substitution, includeClass) {
   const includeClassValue = includeClass ? "withClass" : "withoutClass";
 
   // TODO: implement more texts
@@ -48,3 +45,10 @@ export function getNextAndPrevDay(date) {
     getDateSkippingWeekend(new Date(date.getTime() - 86400000)),
   ].map((e) => e.getTime());
 }
+
+export function setUTCMidnight(date) {
+  // Set the time to UTC midnight while keeping the correct date
+  return new Date(
+    Date.UTC(date.getFullYear(), date.getMonth(), date.getDate())
+  );
+}