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}}

2. 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}}