Use function calling for datetime #3
Description
Currently the system prompt inlines date and time from the server runtime as text. The right way to do this is to use the function calling API so that the LLM can request the time at any point during the interaction which enables conversations that depend on time elapsed during the conversation including a sense of how long the conversation has been going on.
Other situational metadata that could be referenced by the LLM should likewise be provided through function calling.