Okay, You did not specify colors for each one but here is a example that you could edit the hex code for each one.
What you need to do is add a tag in the Extra Properties section of the style editor.
CP>Styles
Edit the style in question.
Then select Extra Properties and expand it.
For this example I grabbed a style that had all the same colors but each one can be changed.
.subjecttable .date {
color: #FFFF00;
}
.subjecttable .time {
color: #FFFF00;
font-weight: bold;
}
.tdheader .date {
color: #FFFF00;
font-weight: bold;
}
.tdheader .time {
color: #FFFF00;
font-weight: bold;
}
.forumtitle .date {
color: #FFFF00;
}
.forumtitle .time {
color: #FFFF00;
}
.topictime .time {
color: #FFFF00;
}
.topictime .date {
color: #FFFF00;
}
.alt-topictime .time {
color: #FFFF00;
}
.new-topictime .date {
color: #FFFF00;
}
.new-alt-topictime .time {
color: #FFFF00;
}
.posttime .time {
color: #FFFF00;
}
.posttime .date {
color: #FFFF00;
}
Then just change the hex code for each color desired.
Note that some are using bold so change as needed.
Also this does not need your scripts to be changed so you probably need to put back the original files on your site.