Change in Calender

Hello,

If i change Calender of a existing project in cProject, will it effect the roles and resource assigned to it and will the budget effect due to this change?

For example- My project duration is from 2012 to 2016, Till date I am using India's calendar for a project in cProject and now i want to use it UK calendar. So, my question is will it effect my budget for past years?

Thanks and regards,

Roshan