diff --git a/apps/desktop/src/components/grid/DataGrid.vue b/apps/desktop/src/components/grid/DataGrid.vue
index 3d3eac0ade..43cb8263e1 100644
--- a/apps/desktop/src/components/grid/DataGrid.vue
+++ b/apps/desktop/src/components/grid/DataGrid.vue
@@ -174,6 +174,8 @@ import {
   applyColumnFormatter,
   buildColumnFormatterKey,
   defaultIoTDBTimestampFormatter,
+  DataGridDateTimePatterns,
+  displayTimeZoneOption,
   formatIoTDBTimestampEditorValue,
   getSupportedTimeZoneOptions,
   iotdbTimestampFractionDigits,
@@ -184,7 +186,6 @@ import {
   type ColumnFormatterConfig,
   type DateTimeFormatterUnit,
   type ForeignKeyDisplayFilterConfig,
-  DateTimePatterns,
 } from "@/lib/dataGrid/columnFormatter";
 import { temporalCellEditorConfig, type TemporalCellEditorConfig } from "@/lib/dataGrid/dataGridTemporalEditor";
 import { BOOLEAN_CELL_EDITOR_VALUES, booleanCellEditorValue, isBooleanCellValue, isBooleanColumnType, isPointInBooleanCheckbox, nextBooleanCellValue, normalizeBooleanCellValue, parseBooleanCellEditorValue } from "@/lib/dataGrid/dataGridBooleanColumn";
@@ -12983,7 +12984,7 @@ function openGridSnapshot() {
                                   </div>
                                   <SearchableSelect
                                     :model-value="formatterDatetimePattern"
-                                    :options="DateTimePatterns"
+                                    :options="DataGridDateTimePatterns"
                                     :placeholder="t('grid.formatterDatetimePatternPlaceholder')"
                                     :search-placeholder="t('grid.formatterDatetimePatternPlaceholder')"
                                     :empty-text="t('grid.formatterDatetimePatternEmpty')"
@@ -13002,6 +13003,7 @@ function openGridSnapshot() {
                                   <SearchableSelect
                                     :model-value="formatterDateTimezone"
                                     :options="timezoneOptions"
+                                    :display-name="displayTimeZoneOption"
                                     :placeholder="t('grid.formatterDatetimeTimezonePlaceholder')"
                                     :search-placeholder="t('grid.formatterDatetimeTimezonePlaceholder')"
                                     :empty-text="t('grid.formatterDatetimeTimezonePlaceholder')"
diff --git a/apps/desktop/src/lib/dataGrid/columnFormatter.ts b/apps/desktop/src/lib/dataGrid/columnFormatter.ts
index a8aa7330af..b53630f021 100644
--- a/apps/desktop/src/lib/dataGrid/columnFormatter.ts
+++ b/apps/desktop/src/lib/dataGrid/columnFormatter.ts
@@ -28,6 +28,9 @@ export const DateTimePatterns = [
   "YYYY/MM/DDTHH:mm:ssZ",
   "YYYY/MM/DDTHH:mm:ss.SSSZ",
 ];
+// Keep global date-time formats compatible with the backend; the data grid can
+// additionally render Day.js 12-hour display patterns locally.
+export const DataGridDateTimePatterns = [...DateTimePatterns, "YYYY-MM-DD hh:mm:ss A"];
 const SUPPORTED_DATE_TIME_PATTERN_TOKENS = ["YYYY", "SSS", "ZZ", "MM", "DD", "HH", "mm", "ss", "M", "D", "H", "m", "s", "Z"];
 const STRICT_LOCAL_DATETIME_INPUT_PATTERNS = [
   "YYYY-MM-DD",
@@ -72,6 +75,14 @@ interface IntlTimeZoneSupport {
   supportedValuesOf?: (key: "timeZone") => string[];
 }
 
+const TIME_ZONE_DISPLAY_ALIASES: Record<string, string> = {
+  "Asia/Calcutta": "Asia/Kolkata",
+};
+
+export function displayTimeZoneOption(timeZone: string): string {
+  return TIME_ZONE_DISPLAY_ALIASES[timeZone] ?? timeZone;
+}
+
 export function getSupportedTimeZoneOptions(intl: IntlTimeZoneSupport, fallbackTimeZone = "UTC"): string[] {
   try {
     const timeZones = intl.supportedValuesOf?.("timeZone");