diff --git a/src/plugins/data/common/search/aggs/agg_configs.test.ts b/src/plugins/data/common/search/aggs/agg_configs.test.ts
index 104cd3b2815bc..80e5a079cfd59 100644
--- a/src/plugins/data/common/search/aggs/agg_configs.test.ts
+++ b/src/plugins/data/common/search/aggs/agg_configs.test.ts
@@ -360,6 +360,7 @@ describe('AggConfigs', () => {
           "0": Object {
             "range": Object {
               "@timestamp": Object {
+                "format": "strict_date_optional_time",
                 "gte": "2021-05-05T00:00:00.000Z",
                 "lte": "2021-05-10T00:00:00.000Z",
               },
@@ -368,6 +369,7 @@ describe('AggConfigs', () => {
           "86400000": Object {
             "range": Object {
               "@timestamp": Object {
+                "format": "strict_date_optional_time",
                 "gte": "2021-05-04T00:00:00.000Z",
                 "lte": "2021-05-09T00:00:00.000Z",
               },
diff --git a/src/plugins/data/common/search/aggs/agg_configs.ts b/src/plugins/data/common/search/aggs/agg_configs.ts
index 3157735a39967..49edca1a3240d 100644
--- a/src/plugins/data/common/search/aggs/agg_configs.ts
+++ b/src/plugins/data/common/search/aggs/agg_configs.ts
@@ -406,6 +406,7 @@ export class AggConfigs {
                     .map(([filter, field]) => ({
                       range: {
                         [field]: {
+                          format: 'strict_date_optional_time',
                           gte: moment(filter?.query.range[field].gte).subtract(shift).toISOString(),
                           lte: moment(filter?.query.range[field].lte).subtract(shift).toISOString(),
                         },
diff --git a/src/plugins/data/common/search/aggs/utils/time_splits.ts b/src/plugins/data/common/search/aggs/utils/time_splits.ts
index 0510f629540f6..a51905da80618 100644
--- a/src/plugins/data/common/search/aggs/utils/time_splits.ts
+++ b/src/plugins/data/common/search/aggs/utils/time_splits.ts
@@ -430,6 +430,7 @@ export function insertTimeShiftSplit(
       filters[key] = {
         range: {
           [timeField]: {
+            format: 'strict_date_optional_time',
             gte: moment(timeFilter.query.range[timeField].gte).subtract(shift).toISOString(),
             lte: moment(timeFilter.query.range[timeField].lte).subtract(shift).toISOString(),
           },