Respuesta :
Since Australia is not in the northern hemisphere so probably only has standard time and is 15 hours ahead of us in the Pacific area in North America I believe that the person would have to log in at 12 midnite on May 29th to join the webinar at 10 AM PDT.
Australia is 17 hours ahead of the Pacific Time Zone. With that being said, if you need to attent a web conference at 10am PDT, you need to log on at 3am local time. To find the time add 17 hours to the time zone you are in. 10 hours plus another 12 is 10pm then 5 more hours from 10pm is 3am.