Time handling with moment timezone

1. Convert local time to timestamp with offset
   th.dateObj is a unix timestamp in milliseconds
   tzString is a zone string like 'America/New_York'

moment(th.dateObj).tz(tzString).format()  
// example output: 2019-10-07T17:30:00-04:00

2. Convert to local time if you know the zone name

event.zoneName = 'America/New_York'  
moment(event.timeStart).tz(event.zoneName).format('MMMM Do YYYY, h:mm a z')

3. Convert to local time from date time stamp with offset but no timezone name. Note: without location information you can't get the actual time zone out because of daylight savings.

moment.parseZone(record.timeStart).format('ddd, MMM D YYYY h:mm a');