tv_sec is not a time_t... use one for localtime_r()

about global_defs.ssjs

ports.

Fix spelling error which keeps spreading to new files.

Re-introduced xpTimeZone_t to isoDate/Time_t conversion functions.

of "bound-less" date/time values.

Created functions:  isoTimeZone_parse, isoDateTime_parse, and
xpDateTime_to_isoDateTime.
Created macro: LOCAL_UTC_DIFF which gives a "normalized" timezone value.

isoDate/Time and time_t. These new structures support fractional seconds and
time-zone information.

Created macros to return year/month/day/hour/min/sec from iso date/time values.
Created isoDateTime_create() to create an isoDateTime_t from individual
date and time components (i.e. year, month, day, hour, min, sec).

values in ISO-8601 format.

"CCYYMMDDTHHMMSS".