Centralize Index <> Time Stamp Converter Object

[edwinnglabs]

Is your feature request related to a problem? Please describe. Right now we have a few utils to convert time stamp array to index and vice versa. However, we have multiple places to request to data exchange. To reduce overhead in computation and inconsistency in logic control, we should have a OO designed convertor to do all these calculation and get-set service.

Describe the solution you'd like Create a TimeStampIndexConvert object and handle all these in a centralized way.