Quick Clarification Plz

<p>Hi,</p>

<p>Just need a very quick clarification: If the common app is Mar 15th, does it mean I should submit it 23:59 on Mar 14th or 23:59 on Mar 15th? I am still working on my essays, so if it is 23:59 Mar 15, it seems i do need one more day.</p>

<p>Thx!!!</p>