.date-header span {
background-color: #ffffff;
padding: 1px 15px;
position: relative;
text-transform: uppercase;
top: 0px;
width: 120px;
z-index: 1500 ;
}
h2.date-header {
background: none repeat scroll 0 0 #000;
height: 1px;
width: 300px;
font-weight: 590;
text-align: center;
}
h2.date-header span {
margin-left: 260px;
padding-left: 0px;
font-weight: 1650px;
text-transform: uppercase;
text-align: center;
}
.post {border-top: 1px #111 solid ;}
Wartości marginesu lewego, górnego i inne ustawiasz wedle uznania.
I voilà!