Talks I've watched
Emily Ashley: 7 Falsehoods Programmers Believe about Place & Time
Emily described how the human side of collecting and visualising time-based data is more complicated than you might think, highlighting issues like varying precision where some data might have a year only, or some might be ordinal where some event happened before another but we don't know the precise time. These things don't fit well into our common date/time format. She didn't recommend any particular solutions, but mentioned that ISO 8601 does cover a range of cases.