I should also mention migration from previous versions if there are breaking changes. But since the user didn't specify, I can note that it's a backward-compatible update with minimal breaking changes, and provide any necessary tips for upgrading.
DateTool might now support ISO 8601 formatting more easily, or have better handling of time zones. BeanUtil could have more efficient copying or handling of null values. Maybe new methods in StringUtil for string manipulation. hutool 39 new
Need to ensure the examples are syntactically correct. For instance, using the new DateUtil method: I should also mention migration from previous versions