If by "scenario" you mean a WorldBuilder Scenario, then you can do it by editing that file. You can edit the file just by right-clicking it and hitting "edit", or "Open with" and the text editor of your choice.
Then, check out Dale's great reference to what goes on in that file. (I think you're looking for adding "Era=ERA_MODERN" under the BeginGame section).
i edited one of the world map to start with another ERA but when i start the map nothing really change !
it writes the new era but the rest is still like the first one !
How much work was this scenario? You could just start a new game, only when you start select Custom Game instead of Play Now. There you can pick your start era. Then go into world builder and redo your scenario.
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