このようなもの?
jsフィドル
.date {
font-family: sans-serif;
font-size: 14px;
font-weight: 500;
color: white;
margin-top: 9px;
opacity: 0.7;
letter-spacing: 3px;
text-transform: uppercase;
background-color: #adadad;
padding:10px;
margin-left:-41px;
margin-right:-41px;
padding-left:30px;
display : block;
/* IE9 SVG, needs conditional override of 'filter' to 'none' */
background: url(data:image/svg+xml;base64,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);
background: -moz-linear-gradient(left, rgba(173,173,173,1) 0%, rgba(173,173,173,0.18) 82%, rgba(255,255,255,0) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, right top, color-stop(0%,rgba(173,173,173,1)), color-stop(82%,rgba(173,173,173,0.18)), color-stop(100%,rgba(255,255,255,0))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(left, rgba(173,173,173,1) 0%,rgba(173,173,173,0.18) 82%,rgba(255,255,255,0) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(left, rgba(173,173,173,1) 0%,rgba(173,173,173,0.18) 82%,rgba(255,255,255,0) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(left, rgba(173,173,173,1) 0%,rgba(173,173,173,0.18) 82%,rgba(255,255,255,0) 100%); /* IE10+ */
background: linear-gradient(to right, rgba(173,173,173,1) 0%,rgba(173,173,173,0.18) 82%,rgba(255,255,255,0) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#adadad', endColorstr='#00ffffff',GradientType=1 ); /* IE6-8 */
}
CSS グラデーション ジェネレーターを使用してグラデーションを生成します。