Time stamps

Various protocols rely on the definition of a time stamp type, Stamp, compatible with the suggested Preserves convention for dates and times.

Stamp = <rfc3339 @value string> .

From the Preserves convention document:

Dates, times, moments, and timestamps can be represented with a Record with label rfc3339 having a single field, a String, which MUST conform to one of the full-date, partial-time, full-time, or date-time productions of section 5.6 of RFC 3339. (In date-time, “T” and “Z” MUST be upper-case and “T” MUST be used; a space separating the full-date and full-time MUST NOT be used.)