UTC seconds at which the bar containing timeSec opened.
zone is the fallback for calendar buckets that did not pin their own, and
should be the chart's configured timezone. Count-driven bars have no time
bucket at all, so their bar simply opens at the tick that started it.
UTC seconds at which the bar containing
timeSecopened.zoneis the fallback for calendar buckets that did not pin their own, and should be the chart's configured timezone. Count-driven bars have no time bucket at all, so their bar simply opens at the tick that started it.