diff --git a/tools/stats/print_test_stats.py b/tools/stats/print_test_stats.py
index caf2f08da3e..d1b40cbdac5 100755
--- a/tools/stats/print_test_stats.py
+++ b/tools/stats/print_test_stats.py
@@ -700,6 +700,7 @@ def build_info() -> ReportMetaMeta:
         "build_branch": os.environ.get("CIRCLE_BRANCH", ""),
         "build_job": os.environ.get("JOB_BASE_NAME", ""),
         "build_workflow_id": os.environ.get("CIRCLE_WORKFLOW_ID", ""),
+        "build_start_time_epoch": str(int(os.path.getmtime(os.path.realpath(__file__)))),
     }
 
 
diff --git a/tools/stats/s3_stat_parser.py b/tools/stats/s3_stat_parser.py
index 3dccac4efda..71474bf487c 100644
--- a/tools/stats/s3_stat_parser.py
+++ b/tools/stats/s3_stat_parser.py
@@ -48,6 +48,7 @@ class ReportMetaMeta(TypedDict):
     build_branch: str
     build_job: str
     build_workflow_id: str
+    build_start_time_epoch: str
 
 
 class ReportMeta(ReportMetaMeta):
diff --git a/tools/test/test_stats.py b/tools/test/test_stats.py
index f2fa1b0a99a..46ad2874860 100644
--- a/tools/test/test_stats.py
+++ b/tools/test/test_stats.py
@@ -22,6 +22,7 @@ def dummy_meta_meta() -> ReportMetaMeta:
         'build_branch': '',
         'build_job': '',
         'build_workflow_id': '',
+        'build_start_time_epoch': '',
     }