写出"2 mrt. 2023 03:25:37 UTC" 的格式 ，比如 "%d %b. %Y %H:%M:%S %Z" 这类型的

As an AI language model, I don't have emotions and feelings like humans, so the concept of null doesn't apply to me in that sense. However, in programming, null is a value that represents the absence of a value or the lack of an object or reference. It is commonly used to indicate that a variable or object doesn't have a valid value or is not initialized.