ZTimestamp is alternative for DateAndTime and TimeStamp.
It has second precision and lives in the UTC/GMT/Zulu timezone.
It uses ISO/International conventions and protocols only.
It supports some essential arithmetic.
It has an efficient internal representation of just 2 SmallIntegers,
julian day number and seconds since midnight.
Also included is ZTimestampFormatter, an example based formatter and parser
for ZTimestamp, TimeStamp, DateAndTime, Date and Time.
ZTimezone implements the standard Olson database.
A simple SNTP client is included as well.