Dynamic Field Value

You can set Dynamic Default Value for Fields by using Dynamic Tags.
Edit Field > Settings > Default Value

1. Current Date Time

{{current_date_time}}

You can custom date format like this {{current_date_time | date_format:Y-m-d H:i:s}}

2. Current Request (POST, GET)

E.g You want to get parameter value from url https://piotnetforms.com/?utm_source=facebook
{{request | parameter:utm_source}}

3. Current User Info

{{user_info | meta:ID}}

{{user_info | meta:user_login}}

{{user_info | meta:user_nicename}}

{{user_info | meta:user_email}}

{{user_info | meta:user_url}}

{{user_info | meta:user_registered}}

{{user_info | meta:user_status}}

{{user_info | meta:display_name}}

{{user_info | meta:custom_user_meta}}

4. Current Post / Page

{{post_id}}

{{post_title}}

{{post_url}}

5. Shortcode

{{shortcode | shortcode:[your_shortcode]}}