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setDisplayZone - sets the seconds d_displayZoneShift wrt UTC.
Argument must allow for TZ and DST shifts.
utcSec2timeStruct - receives a *TimeStruct and a time in UTC
sets the TimeStruct's tm_isdst flag if the current
object's d_dstShift is unequal to zero.
dstCorrection - returns 3600 if the current time has DST, based on the
computer's locattime computation given UTC sec.
returns 0 otherwise.
updateTime - called when a time field (day, seconds, year, fields, etc)
is updated. Sanitizes the fields (day 32 -> next month,
etc)
d_tm2d_tm - receives (TZ + DST) shift in minutes,
d_tm2utcsec - assigns UTC seconds matching d_tm to d_utcSec
zoneShiftSeconds - receives zone shift in minutes, returns shift in
seconds, based on TZ shifts being multiples of
30 minutes.
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