How can I add timestamp to subject of unbounce notification email

Hi Celil, 

Even on the Pro and up Unbounce accounts which allow more customization of the email notification, I don’t believe inserting a dynamic variable like a date is possible. 

You have a couple of options here:

1. Write your own webhook/script that creates and sends the email. A bit more information about this options is available here. 

2. Try doing it through a service like Zapier that works wonderfully with Unbounce

Best,
Hristian