refactor: recover day after indicator

packages/utils/index.ts

@@ -65,6 +65,9 @@ export { validateEndAction, validateTimerType } from './src/validate-events/vali
 
 // feature business logic
 
+// feature business logic - rundown
+export { checkIsNextDay } from './src/date-utils/checkIsNextDay.js';
+
 // feature business logic - spreadsheet import
 export {
   type ImportCustom,

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

@@ -0,0 +1,13 @@
+/**
+ * Utility function checks whether a given event is the day after from its predecessor
+ * We consider an event to be the day after, if it begins before the start of the previous
+ * @example day after
+ * 09:00 - 10:00
+ * 08:00 - 10:30
+ * @example same day
+ * 09:00 - 10:00
+ * 09:30 - 10:30
+ */
+export function checkIsNextDay(previousStart: number, timeStart: number): boolean {
+  return timeStart <= previousStart;
+}