Requirement: Display Obs To Obs Flowsheet based on date range.
Obs To Obs FlowSheet wiki does not mention startDate and endDate which is supported by the obsToObsFlowSheet directive and all the way up to Bahmni Core DAO
Solution - Of course it is not useful to set (read hard code) these dates in bahmni_config/openmrs/apps/clinical/dashboard.json but can certainly be used in custom display control built on top of Obs To Obs FlowSheet .