refactor: show running gap in UI

packages/utils/src/date-utils/isNewLatest.ts

@@ -0,0 +1,24 @@
+import { checkIsNextDay } from './checkIsNextDay.js';
+
+/**
+ * Checks whether a new element is the latest in the list
+ */
+export function isNewLatest(timeStart: number, timeEnd: number, previousStart?: number, previousEnd?: number): boolean {
+  // true if there is no previous
+  if (previousStart === undefined || previousEnd === undefined) {
+    return true;
+  }
+
+  // true if it starts after the previous is finished
+  if (timeStart >= previousEnd) {
+    return true;
+  }
+
+  // true if it finishes later than previous
+  if (timeEnd > previousEnd) {
+    return true;
+  }
+
+  // true if it is the day after
+  return checkIsNextDay(previousStart, timeStart, previousEnd - previousStart);
+}