how is YTD calculated in bex ?

we have a requirement to calculate YTD for revenue in a report. Just want to understand if YTD is always the current year restricted to KF or we need to consider the value from the user like 0fiscper and adjust YTD, as per the user input. I mean for example if user enter input 002.2013, then the YTD will have 2013 value or still 2014 value because YTD is current year to date.

My reporting requirement is as below. red are colmns.

customer           YTD revenue              Feb 2013 ( user input value- revnue will be fetch based on user input).

But YTD will be always for current year right ? Does it depend on the user requirement ? Should I ask user or its generic, Please confirm.

Thanks

DR