Track budget per different cost rate per hour depends of the day.

Track budget per different cost rate per hour depends of the day.

Hello,

We want to migrate to Zoho projects and found one problem how to track budget per project when you have different rates depending time of day. I mean from 8-17 cost is for eg. 100$, from 17-22 is 150$ and during night customer should pay 200$ per hour. 

Does anyone have any idea how to track this time?