Difference between Code Timezone and server Timezone

Hi, im currently using lightsail servers to deploy web solutions. Using Python and Django. Even if i set the program and database to our timezone (Chilean timezone) the records are still having a 3 hour delay (We think it might be the server time)

Our current solution to this is mannualy change the Querys regarding recording time in our database.

So, the question is: ¿Has anyone encounter this problem before? how do you mange to solve it?