You have to hold on to your SIAF shares until the 15th, one day after the pay date. Because exchange rules dictate the ex-date should be the 15th.
Even if FINRA announces an ex-date before the 15th (or the company, or anyone else) you cannot trust it. They can and probably will correct it later on.
That's the easiest and safest way to explain it. Wait until the 15th if you want the dividend.