If you need to reschedule an event you have two options -- modify the existing invitation with a new date and time or create a new invitation with the new information.
To adjust an existing invitation, first update the date on your invite. Head to the Design & Details
page to update the date, time and any other changes
. After you have saved your new details, on the Manage Invitation
page use the "Email Guests" tab and the Send a Message
feature to update your guests with the new details. The message you send will include a link to the guests' invitation, which has now been updated. Any changes you make to an existing invite will be retroactively applied to invitations you've already sent out.
If you wanted to create a new invitation, you can use your old invite as a template by using the Copy button below the current invite on your dashboard. You'll then be able to retain the same guest list, design, and other invitation options while adding the new date and time. You can read a bit more about copying an older invite here