https://nshipster.com/timeinterval-date-dateinterval/ Matttさんも疑問とのことで >>>While we’re on the subject of conjectural sidebars, does anyone know why Apple created a new standard instead of using, say, the Unix Epoch (January 1, 1970)? 2001 was the year that Mac OS X was first released, but NSDate pre-NSDates that from its NeXT days. Was it perhaps a hedge against Y2K? (edited)

Our limited understanding of time is reflected in — or perhaps exacerbated by — the naming of the Foundation date and time APIs. It’s about time we got them straight.