重力形式将日期转换为Unix并添加一年

Question

I'm trying to convert a date in WordPress Gravity Forms from dmy to Unix, which works fine by adding the below to functions.php but I want to add a +1 year to the converted date. Where am I going wrong?

  function rkv_datesubmit_fix2 ($form){
        //ACTUAL START DATE FIELD, date field id is 601 in gravity forms
        $raw_srt = $_POST['input_601'];
        $raw_end = $_POST['input_602'];

        // convert dates to unix
        $fix_srt = strtotime ($raw_srt);
        $fix_end = strtotime($raw_end);

            //output to gravity forms field 603 (start date)
            //output to gravity forms field 604 (end date)
        $_POST['input_603'] = $fix_srt;
        $_POST['input_604'] = $fix_end;
    }

add_action('gform_pre_submission', 'rkv_datesubmit_fix2');

If it change $fix_srt = strtotime ($raw_srt); to strtotime('+ 1 year', $raw_srt); I get 1971/1/1, not the original input date from Gravity field 601 plus a year.

Answer 1

Here is the working code:

function rkv_datesubmit_fix2 ($form){
    //ACTUAL START DATE FIELD, date field id is 601 in gravity forms
    $raw_srt = $_POST['input_601'];
    $raw_end = $_POST['input_602'];

    // convert dates to unix
    $fix_srt = strtotime ($raw_srt);
    $fix_end = strtotime($raw_end.' + 1 year');

    //output to gravity forms field 603 (start date)
    //output to gravity forms field 604 (end date)
    $_POST['input_603'] = $fix_srt;
    $_POST['input_604'] = $fix_end;
}

add_action('gform_pre_submission', 'rkv_datesubmit_fix2');

For adding +1 year to $fix_end we just used strtotime($raw_end.' + 1 year'). This is simplest way to achieve the result you want.