To delay posting on existing announcements until a specific date in a Canvas course, follow these steps:

Open Announcements: Navigate to the Announcements section in your course.
Select the Announcement: Click on the title of the announcement you wish to delay.
Edit the Announcement: Click the "Edit" button to modify the announcement.
Delay Posting: Check the "Delay Posting" checkbox.
Set Date and Time: Choose the desired date and time for the announcement to be posted by clicking on the Calendar icon and selecting the appropriate date and time. Alternatively, you can manually enter the date and time.
Save: Click the "Save" button to apply the changes.

The announcement will now be scheduled to post at the specified date and time and will not be visible to students until then

If you encounter any issues, such as the delay date not being set correctly after importing announcements from another course, ensure that you review and adjust the posting dates before publishing the course

Set "Delay Delivery" dates for announcements.