Pre-Parser help needed

[rvgulik]

I want to do the following :

I have 3 fields r_day_of_birth, r_month_of_birth and r_year_of_birth

I want these 3 fields combined to ddmmyyyy and calculate the age.

On top of this i want to calculate the age on a certain date : 1 september 2013.

The calculated value should be put into a field called age.

How do i achieve this??? Any help is very welcome.

[bills]

Hi,

Take a look at this example...you can easily apply to your date question.
http://modules.formtools.org/submission_...ds_example

To calculate age on a specific date, take a look at this function:
http://www.populate.it/age_on_date_php.html