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-rw-r--r--openstack/common/timeutils.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/openstack/common/timeutils.py b/openstack/common/timeutils.py
index c536cb2..345f315 100644
--- a/openstack/common/timeutils.py
+++ b/openstack/common/timeutils.py
@@ -30,7 +30,7 @@ TIME_FORMAT = "%Y-%m-%dT%H:%M:%S"
def isotime(at=None):
"""Stringify time in ISO 8601 format"""
if not at:
- at = datetime.datetime.utcnow()
+ at = utcnow()
str = at.strftime(TIME_FORMAT)
tz = at.tzinfo.tzname(None) if at.tzinfo else 'UTC'
str += ('Z' if tz == 'UTC' else tz)