cdm/src/main/java/ucar/nc2/units/DateUnit.java
public Date getDateOrigin() {
    if (!(uu instanceof TimeScaleUnit)) return null;
    TimeScaleUnit tu = (TimeScaleUnit) uu;
    return tu.getOrigin();
  }
public Date getDateOrigin() {
    if (!(uu instanceof TimeScaleUnit)) return null;
    TimeScaleUnit tu = (TimeScaleUnit) uu;
    return tu.getOrigin();
  }
Get the origin Date.

@return Date or null if not a time unit.