Also, don't know how you're set up there beyond that cam. Unless you've limited it in some way, if it and the rest of your cams can get to an outside time server, they also can get to other places to phone home or do whatever. Better to block outside access and segregate cameras from the rest of your network if you can. In that case you can run an internal time server (e.g., NetTime). But that's a much larger subject...