diff --git a/opentelemetry-sdk/src/opentelemetry/sdk/util.py b/opentelemetry-sdk/src/opentelemetry/sdk/util.py
index d855e851794..4f4ec82b9d9 100644
--- a/opentelemetry-sdk/src/opentelemetry/sdk/util.py
+++ b/opentelemetry-sdk/src/opentelemetry/sdk/util.py
@@ -26,5 +26,5 @@ def time_ns():
 
 def ns_to_iso_str(nanoseconds):
     """Get an ISO 8601 string from time_ns value."""
-    ts = datetime.datetime.fromtimestamp(nanoseconds / 1e9)
+    ts = datetime.datetime.utcfromtimestamp(nanoseconds / 1e9)
     return ts.strftime("%Y-%m-%dT%H:%M:%S.%fZ")