java.util.Calendar (a UTC calendar over epoch-ms): getInstance, the int
field constants, set/get/setTime/getTime/getTimeInMillis. java.time pieces
for a zoned round-trip: DateTimeFormatter/ISO_ZONED_DATE_TIME, formatter
.withZone/.parse, LocalDateTime/parse (with formatter), Instant/from,
.toLocalDate/.atStartOfDay. java.sql.Date is now a distinct class (its own
host value + dispatch tags) so a protocol extended to both java.util.Date
and java.sql.Date routes a sql.Date to its own impl. All UTC-consistent.
data.json print-sql-date + print-time-supports-format pass (suite 137/139).
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