Add new input parameter to express the format of all submitted dates

[dshorthouse]

One use case is the bulk conversion of dates in a known though ambiguous structure into parsed components. For example, if a date to be processed was expressed as "10/8/1972", under normal circumstances it would be ambiguous. But, if you could additionally inform the processor that the date is expressed as "DD/MM/YYYY", then it could be parsed without problem. One user has expressed a need for this because it would assist with their need to parse dates into columns without having to return to a source database and re-execute an export & to express dates in ISO.