Fix tests

gallery/utils/datetime_utils.py

@@ -0,0 +1,30 @@
+"""Date and time utility functions."""
+
+from datetime import datetime
+
+
+def datetime_from_timestamp(timestamp: float) -> datetime:
+    """
+    Convert a Unix timestamp to a datetime object.
+
+    Args:
+        timestamp: Unix timestamp as float
+
+    Returns:
+        datetime object
+    """
+    return datetime.fromtimestamp(timestamp)
+
+
+def strftime_filter(dt: datetime, fmt: str) -> str:
+    """
+    Format a datetime object using strftime.
+
+    Args:
+        dt: datetime object to format
+        fmt: strftime format string
+
+    Returns:
+        Formatted datetime string
+    """
+    return dt.strftime(fmt)