[John Lester]

Add the changes below to your additional.css file adjusting the hex color accordingly.

ACP -> Styles & Templates -> Style Manager -> your style here -> Edit Templates -> CSS Templates -> additional.css

The code below changes the DATE COLOR

.postbit .posthead .postdate.old, .postbitlegacy .posthead .postdate.old {
    background: url("images/statusicon/post_old.png") no-repeat scroll left center transparent;
    color: #000000 !important;
}

The code below changes the TIME COLOR for POSTBIT LEGACY (the one you're/op using)

.postbitlegacy .posthead .time {
    color: #000000 !important;
    font: 12px Tahoma,Calibri,Verdana,Geneva,sans-serif;
}

The code below changes the TIME COLOR for POSTBIT users (horizontal postbit info)

.postbit .postdate .time {
    color: #000000 !important;
    margin-left: 10px;
}