Most useful MS-Access built-in functions have identical VB.Net counterparts. For the complete list of VBA/VB.Net compatible functions, refer to the SSRS "Supported Access Report Features" help topic.
Since the VB.Net Format function does not include a Quarter interval (Format(DateExpr, "q"), the equivalent DatePart("q", DateExpr) function is substituted for the Format function when encountered.
In addition, the "Medium Date" format specification differs from VB.Net. With MS-Access, "Medium Date" displays as "01-FEB-07", whereas VB.Net uses the Regional setting for medium dates, ex. for the USA "02/01/2007". When Format functions contain the "Medium Date" specification, it is replaced with "dd-MMM-yy".