Purges all flags of a particular content block over a defined date/time range. 

This method can be accessed through the Flagging.asmx file located in:

~/Workarea/webservices/WebServiceAPI/Community/Flag.asmx

[SoapHeader("AuthHeader")]
[SoapHeader("RequestInfoHeader")]
[WebMethod(MessageName = "PurgeFlagEntries", Description = "delets matched entries")]
public void PurgeFlagEntries(long objectId, DateTime startDate, DateTime endDate);

<SoapHeader("AuthHeader")>
<SoapHeader("RequestInfoHeader")>
<WebMethod(MessageName = "PurgeFlagEntries", Description = "delets matched entries")>
Public Function PurgeFlagEntries(objectId As long, startDate As DateTime, endDate As DateTime) As void