What time zone is used on the Xur (Agent of the Nine) timetable?
AEST (Australian Eastern Standard Time) is +10 hours ahead of UTC/GMT (Coordinated Universal Time/Greenwich Mean Time).
When Xur arrives in the Tower, he arrives between the hours of 9am Friday and 9am Sunday UTC, in random locations.
Converted to AEST, this timetable is 7pm Friday (arrival) and 7pm Sunday (departure). Xur will only appear on the map/in the Destiny app between these hours.
UTC, same as Stack Exchange. AEST is UTC+10, so add ten hours to the time on the chart to get your local time.