Return a reference to the earliest valid date (1/1/1).
Declared in <bbldc_terminateddaterangedaycountadapter.h>
virtual
bdlt::Date const&
firstDate() const override;
Return a reference providing non-modifiable access to a bdlt::Date with the value 1/1/1. Note that this value is the earliest date in the valid range of the adapted day-count convention.
earliest valid date (1/1/1)