ISO 8601 uses things like "month" and "day" which aren't fixed duration. There's no clear way to translate such a thing into a machine value, e.g. float64 seconds.

Can you give an example of how this would be used? I'm not clear on whether you are asking for a change to the language, or a change to an existing standard library package, or a new standard library package.

See also https://golang.org/pkg/time/#ParseDuration.

And, of course, the Go standard library already has type time.Duration and you can already write code like

const shortMonth = 30 * 24 * time.Hour
const longMonth = 31 * 24 * time.Hour
const februaryStandard = 28 * 24 * time.Hour
const februaryLeap = 29 * 24 * time.Hour

No more conversion errors.

See also #20757.

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