Your Team weigh-in day is set by the team manager. Check your "My Team" link in the left menus to view the team information.  The weigh-ins close at 23:59 (11:59pm) AEST on the "weigh-in day". 

You can chose to have a reminder emailed to you so that you don't forget to weigh-in. These are sent out on your weigh-in day so you have the whole day to get your details entered.