Time statement shows wrong dates in ESS but correct in Backend

We have customized time statement in HRFORMS and it is being called in ESS for employees. For all employees it works fine since years. However, now we have 1 case, whose time statement in ESS shows all dates as 20 although all other data is correct. When I see the statement in SAP R/3, it is correct. The same statement is to be shown in ESS and yet it is incorrect. What can be the reason?

I don't see point in checking ABAP coding since it works fine in R/3.

Any suggestions?