Convert Date to Unix Time Stamp

Hi,

I am trying to convert a date to a unix time stamp using the plugin Gravity Form and Sugar Events Calendar.


Using the code below, I am trying to combine the action from here and convert it to a unix time stamp using another action from line 108 from here. But I don't really know what to do.

Any help would be greatly appreciated :)

add_action("gform_pre_submission_2", "pre_submission_handler");
function pre_submission_handler($form){
    $_POST["input_12"] = sc_meta_box_save($post_id);
}

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