error Undefined offset, how is fix it?

[eluser]MiniGod[/eluser]
This is producing the error.

Code:

isset($this->input->post('date_go'))

Pretty obvious if you think about it.

Try this:

Code:

$date_go = $this->input->post('date_go') ? $this->input->post('date_go') : jgmdate("Y/m/j");

$this->input->post() returns FALSE (boolean) if the item you are attempting to retrieve does not exist. (from user_guide)