[2020] How to change the server runtime?

Dorianmode is correct.

There is no official way to do that and public servers that would do it would be in violation of our ToS which can lead to potential consequences like delisting of the server on the server browser.

Please keep in mind that our server list prioritizes display of newer servers and that a majority of players expect from a day 0 server a fresh starting experience. Any manipulation of properties to gain advantages for the server ranking to the disadvantage of our players on the server browser are not acceptable.

For concept servers, there is the CivicImportExportMod available that allows to very quickly set up a starting government, which is fully fine, given we want to give that option in the future as a native game feature.