Rounding

[ariebovenberg]

It'd make sense to be able to round datetimes in different ways:

• by method: (banker's) rounding, ceil, floor
• by unit: seconds, minutes, hours, etc.
• by amount: 15 minutes, 30 seconds, etc.

The temporal API probably gives a big hint for doing this.

[BurntSushi]

Yeah, the Temporal API does indeed provide rounding APIs for datetime types. But what's even more useful, IMO, is rounding and re-balancing for durations. There are a lot of options availabe on, for example, ZonedDateTime.until that permit rounding the span returned or even choosing the "biggest" unit.

[ariebovenberg]

When it comes to re-balancing of durations, this issue is relevant as well: #108.