Web to Lead and Default Values

Web to Lead and Default Values

Two questions regarding my Web-to-Lead Form:

1) How can I include hidden fields and assign values in a web-to-lead form e.g. Order Date = {today}, Order Status = "New: Web Lead"?

2) Alternatively, how can I create a custom field with date format that has a default value of {today}?

I appreciate any feedback.

Thanks,
Gregg