If you are a premium member, you can schedule your Ecards to be sent on any day up to one year in the future.
To share your Ecard via email, click the "Share" button on the Ecard preview page:
You will then see a popup with the option to share your card via Facebook, link, or email:
Select "Email" and then check the "Send Later" bubble to schedule your Ecard for a future date.
Please note that this feature is not available in the JibJab mobile app at this time.