How to Change the Date Field Format to DD/MM/YYYY in a SSRS report

I am not an expert in SSRS. I have been trying to resolve this issue. Even though the fields are all the same datatype am still getting error and incorrect time difference in the filed in some fields. I do not know what am doing wrong. This is the code. Please find below screen shot also.

Code: =Fields!RptLiteralsLBalanceAsAt.Value & " " & FormatDateTime(First(Fields!InvoiceDateCutOff.Value, “RptParameter”), 2)

Have you tried this:?
=Fields!RptLiteralsLBalanceAsAt.Value & " " & Format(First(Fields!InvoiceDateCutOff.Value, “RptParameter”), “dd/MM/yyyy”)

I changed it and it shows error.

Dates on reports are controlled by
Format Culture in User Account Maintenance

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