Not every point in time refers to a timezone. If I write that 1 january 1970 was an eventful date, I can't/dont want to add a timezone to it. Then you may want

Not every point in time refers to a timezone. If I write that 1 january 1970 was an eventful date, I can't/dont want to add a timezone to it. Then you may want to store/format times without dates, etc...