diff --git a/assets/js/mixins/formatter.ts b/assets/js/mixins/formatter.ts
index 6e694b932..bf946f769 100644
--- a/assets/js/mixins/formatter.ts
+++ b/assets/js/mixins/formatter.ts
@@ -379,12 +379,12 @@ export default defineComponent({
       const day = index === 0 ? 6 : 6 + index;
       return new Intl.DateTimeFormat(this.$i18n?.locale, {
         weekday: format,
-      }).format(new Date(Date.UTC(2021, 5, day)));
+      }).format(new Date(2021, 5, day)); // local date avoids UTC timezone day shift
     },
     fmtMonthByIndex(index: number, format: Intl.DateTimeFormatOptions["month"]) {
       return new Intl.DateTimeFormat(this.$i18n?.locale, {
         month: format,
-      }).format(new Date(Date.UTC(2021, index, 1)));
+      }).format(new Date(2021, index, 1)); // local date avoids UTC timezone day shift
     },
     getWeekdaysList(
       format: Intl.DateTimeFormatOptions["weekday"]