Give it a day. We pick up your new date from your Steam page within a day, and your Release Radar refreshes every night. By the next day your radar, best weeks and launch card all show the new date.
"Your date" only shows for an exact day. If your Steam page says a month, a quarter or "coming soon", there is no single week to mark. Your radar then shows the weeks that give your game the most room, and Your date appears once you set a day on Steam.
Weeks run Monday to Sunday, so a launch on any day of that week lands in the same week card.
Still the old date after two days? Check that your Steam store page shows the new date to everyone. If it does, contact us with your game's name.
Tip: a date change is a good moment to look at your best weeks again. The picture around your new date can look quite different.