Hello!
Can anyone please help me with the commands for creating a dummy variable?

Currently, I have time series data between the years 2004-2019 (financial data).

I want to create a dummy variable for the years (2008,2009,2010) = 1, all other years 0. This will represent the financial crisis years. I have 6 independent variables and hoping for the 7th to be my dummy variable.

Anyway,
I'm really stuck on how to do this and don't know what the commands are.

Thanks everyone!