Matt, After some digging I found that I could use an updateattribute processor.  In it I create two custom attributes: since_date ${now():format("yyyy-MM-dd")} since_date_1 ${now():toNumber():minus(86400000):format("yyyy-MM-dd")} Then later in the InvokeHTTP processor I can use the custom attributes in the url line: ... &since=${since_date}&until=${until_date}&earliest=true Even later I then learned those attributes can be created in the GenerateFlowfile processor or used directly in the url as the formula: ${now():format("yyyy-MM-dd")} which is along the lines of what you posted.  Thank you for the response. ... View more