diff --git a/src/views/desktop/insights/tabs/ExplorerChartTab.vue b/src/views/desktop/insights/tabs/ExplorerChartTab.vue
index 2da80162..a9481394 100644
--- a/src/views/desktop/insights/tabs/ExplorerChartTab.vue
+++ b/src/views/desktop/insights/tabs/ExplorerChartTab.vue
@@ -183,6 +183,7 @@ import {
 } from '@/stores/explorer.ts';
 
 import { type NameValue, type TypeAndDisplayName } from '@/core/base.ts';
+import { NumeralSystem } from '@/core/numeral.ts';
 import { Month, WeekDay } from '@/core/datetime.ts';
 import { ChartSortingType, ExportMermaidChartType } from '@/core/statistics.ts';
 import {
@@ -468,7 +469,8 @@ function getCategoriedDataDisplayName(info: CategoriedInfo | SeriesInfo): string
         const parts = name.split('-');
         const year = parts.length === 2 ? parts[0] : '';
         const quarter = parts.length === 2 ? parseInt(parts[1] as string) : 0;
-        const dateTime = year && quarter ? parseDateTimeFromString(`${year}-${quarter * 3}`, TransactionExplorerDimensionType.YearMonth) : undefined;
+        const quarterLastMonth = quarter * 3;
+        const dateTime = year && quarterLastMonth ? parseDateTimeFromString(`${year}-${quarterLastMonth.toString(10).padStart(2, NumeralSystem.WesternArabicNumerals.digitZero)}`, TransactionExplorerDimensionType.YearMonth) : undefined;
         displayName = dateTime ? formatDateTimeToGregorianLikeYearQuarter(dateTime) : tt('Unknown');
     } else if (dimession === TransactionExplorerDataDimension.DateTimeByYear.value) {
         const dateTime = parseDateTimeFromString(name, dimessionType);