If you want to add the Deadline Funnel email timer to your ConvertKit emails, you can follow the instructions here: How to add the Deadline Funnel Email Timer to your ConvertKit emails

Click on Integrations in the top blue bar:
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Select the integration for your campaign:
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Now click on your ConvertKit integration:

Note the name of the custom field that you selected for this campaign:
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Important Note: There can be a delay between when the webhook triggers the deadline for a subscriber and when the subscriber's custom field gets populated with their deadline. Because of this, we recommend that you don't use the custom field in your emails until at least one day after the deadline is initially triggered.

In your email editor, place the cursor where you want to add the dynamic date and time, click the plus next to the text, and then click Personalization:

Click the Subscriber custom fields dropdown and select the custom field that you specified in your integration with Deadline Funnel and then click Add to email:

This will insert the first name placeholder into your email:

When you send yourself the sequence email, you will see that the placeholder has been replaced with the deadline text format you chose in your setup.