Calculate Date with JavaScript on load

HI,

I want to calculate an input field (date[fa_bindefrist]) depending on a second input field (months[fa_bindung]).
I choose the months from a dropbox (e. g. 6) and want to have the date calculated by Javascript on load event: Date is today + number of months.
Sounds easy, but I just can't get it right. 

Please help.
Thanks!

I didn't find the right solution from the Internet.

References: http://asprunner.com/forums/topic/25300-calculate-date-with-javascript-on-load-event/page__s__2164e571cdb53bccdda93f3158dd5074

Internet Marketing Video
 

HI,

I want to calculate an input field (date[fa_bindefrist]) depending on a second input field (months[fa_bindung]).
I choose the months from a dropbox (e. g. 6) and want to have the date calculated by Javascript on load event: Date is today + number of months.
Sounds easy, but I just can't get it right. 

Please help.
Thanks!

I didn't find the right solution from the Internet.

References: http://asprunner.com/forums/topic/25300-calculate-date-with-javascript-on-load-event/page__s__2164e571cdb53bccdda93f3158dd5074

Internet Marketing Video