If you want to add an animated countdown timer into your GetResponse email you can follow the instructions here: How to Add Email Countdown Code to Getresponse

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 GetResponse integration:

Note the name of the custom field that you selected for this campaign:

Important Note: There can be a delay between when the webhook triggers the deadline for a contact and when the contact'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 and click the Custome Fields drop-down:

Now select your custom field that you specified in your integration:

This will insert your custom field placeholder into your email:

If you are being tracked for this campaign and send yourself an email you will see that the placeholder has been replaced with the deadline text format you chose in your setup.