fix(spanner): use future date to avoid time drift (GoogleCloudPlatform#4471)

Takashi Matsuo · web-flow · commit b523300fb6ca · 2020-08-13T12:38:20.000-07:00
fixes GoogleCloudPlatform#4197
diff --git a/spanner/cloud-client/snippets.py b/spanner/cloud-client/snippets.py
@@ -1407,6 +1407,13 @@ def query_data_with_timestamp_parameter(instance_id, database_id):
     database = instance.database(database_id)
 
     example_timestamp = datetime.datetime.utcnow().isoformat() + "Z"
+    # [END spanner_query_with_timestamp_parameter]
+    # Avoid time drift on the local machine.
+    # https://github.com/GoogleCloudPlatform/python-docs-samples/issues/4197.
+    example_timestamp = (
+        datetime.datetime.utcnow() + datetime.timedelta(days=1)
+    ).isoformat() + "Z"
+    # [START spanner_query_with_timestamp_parameter]
     param = {
         'last_update_time': example_timestamp
     }
diff --git a/spanner/cloud-client/snippets_test.py b/spanner/cloud-client/snippets_test.py
@@ -363,9 +363,6 @@ def test_query_data_with_string(capsys):
 
 
 def test_query_data_with_timestamp_parameter(capsys):
-    # Wait 5 seconds to avoid a time drift issue for the next query:
-    # https://github.com/GoogleCloudPlatform/python-docs-samples/issues/4197.
-    time.sleep(5)
     snippets.query_data_with_timestamp_parameter(INSTANCE_ID, DATABASE_ID)
     out, _ = capsys.readouterr()
     assert 'VenueId: 4, VenueName: Venue 4, LastUpdateTime:' in out
