diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 591649a0f..3de17b11f 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,12 @@ dcicutils
 Change Log
 ----------
 
+8.16.4
+======
+* dmichaels / 2024-11-17
+* Very minor fix in datetime_utils.parse_datetime_string.
+
+
 8.16.3
 ======
 * dmichaels / 2024-11-08
diff --git a/dcicutils/datetime_utils.py b/dcicutils/datetime_utils.py
index c28e7553f..3c5f340bc 100644
--- a/dcicutils/datetime_utils.py
+++ b/dcicutils/datetime_utils.py
@@ -53,7 +53,10 @@ def parse_datetime_string(value: str) -> Optional[datetime]:
     if tz_hours < 0 or tz_minutes < 0:
         tz_hours, tz_minutes = get_local_timezone_hours_minutes()
     try:
-        dt = datetime.strptime(value, "%Y-%m-%d %H:%M:%S")
+        try:
+            dt = datetime.strptime(value, "%Y-%m-%d %H:%M:%S")
+        except Exception:
+            dt = datetime.strptime(value, "%Y-%m-%d %H:%M:%S.%f")
         tz = timezone(timedelta(hours=tz_hours, minutes=tz_minutes))
         return dt.replace(tzinfo=tz)
     except Exception:
@@ -214,11 +217,12 @@ def format_datetime(value: datetime,
         if utc is True:
             tz = timezone.utc
         elif not isinstance(tz, timezone):
-            tz = get_local_timezone()
             if tz is True:
                 notz = False
+                tz = get_local_timezone()
             elif tz is False:
                 notz = True
+            tz = get_local_timezone()
         if noseconds is True:
             ms = False
         value = value.astimezone(tz)
diff --git a/pyproject.toml b/pyproject.toml
index 569afe3a5..a2c33e56c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "dcicutils"
-version = "8.16.3"
+version = "8.16.4"
 description = "Utility package for interacting with the 4DN Data Portal and other 4DN resources"
 authors = ["4DN-DCIC Team <support@4dnucleome.org>"]
 license = "MIT"