jQuery UI Datepicker Bootstrap 3 Style

jquery-bootstrap-datepicker.css

.ui-datepicker {
    background-color: #fff;
    border: 1px solid #66AFE9;
    border-radius: 4px;
    box-shadow: 0 0 8px rgba(102,175,233,.6);
    display: none;
    margin-top: 4px;
    padding: 10px;
    width: 240px;
    font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
    font-size: 14px !important;
}
.ui-datepicker a,
.ui-datepicker a:hover {
    text-decoration: none;
}
.ui-datepicker a:hover,
.ui-datepicker td:hover a {
    color: #2A6496;
    -webkit-transition: color 0.1s ease-in-out;
       -moz-transition: color 0.1s ease-in-out;
         -o-transition: color 0.1s ease-in-out;
            transition: color 0.1s ease-in-out;
}
.ui-datepicker .ui-datepicker-header {
    margin-bottom: 4px;
    text-align: center;
}
.ui-datepicker .ui-datepicker-title {
    font-weight: 700;
}
.ui-datepicker .ui-datepicker-prev,
.ui-datepicker .ui-datepicker-next {
    cursor: default;
    font-family: 'Glyphicons Halflings';
    -webkit-font-smoothing: antialiased;
    font-style: normal;
    font-weight: normal;
    height: 20px;
    line-height: 1;
    margin-top: 2px;
    width: 20px;
    color: #999;
}
.ui-datepicker .ui-datepicker-prev {
    float: left;
    text-align: left;
}
.ui-datepicker .ui-datepicker-next {
    float: right;
    text-align: right;
}
.ui-datepicker .ui-datepicker-prev:before {
    content: "\e079";
}
.ui-datepicker .ui-datepicker-next:before {
    content: "\e080";
}
.ui-datepicker .ui-icon {
    display: none;
}
.ui-datepicker .ui-datepicker-calendar {
  table-layout: fixed;
    width: 100%;
}
.ui-datepicker .ui-datepicker-calendar th,
.ui-datepicker .ui-datepicker-calendar td {
    text-align: center;
    padding: 4px 0;
    color: #000 !important;
}
.ui-datepicker .ui-datepicker-calendar td {
    border-radius: 4px;
    -webkit-transition: background-color 0.1s ease-in-out, color 0.1s ease-in-out;
       -moz-transition: background-color 0.1s ease-in-out, color 0.1s ease-in-out;
         -o-transition: background-color 0.1s ease-in-out, color 0.1s ease-in-out;
            transition: background-color 0.1s ease-in-out, color 0.1s ease-in-out;
}
.ui-datepicker .ui-datepicker-calendar td:hover:not(.ui-datepicker-current-day) {
    background-color: #eee;
    cursor: pointer;
}
.ui-datepicker .ui-datepicker-calendar td a {
    text-decoration: none;
    color: #000;
}
.ui-datepicker .ui-datepicker-current-day {
    background-color: #285e8e;
    /* background-color: #4289cc; */
}
.ui-datepicker td.ui-datepicker-current-day a {
    color: #fff;
}
.ui-datepicker .ui-datepicker-calendar .ui-datepicker-unselectable:hover {
    background-color: #fff;
    cursor: default;
}

.ui-datepicker-month {
    border: 0px;
    color: #000;
}
.ui-datepicker-year {
    border: 0px;
    color: #000;
}

For using Jquery UI calendar when on a Bootstrap template.
Don't install a JQuery UI theme. Just place this on top of the Bootstrap CSS definition.

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