Board Thread:Support Requests - Getting Started/@comment-1738746-20150810105205

This may seem like a stupid question but I haven't been able to answer it so with all the reading I've been doing. How can I get different custom signatures, with the timestamp, across different wikias? I mainly ask this because I work on one wikia which has a dark/black background whereas another has a light/white background so the custom siggy I make either works on one or the other... if I want to have the timestamp included anyway. 