* if it is set to the beginning of the Gregorian calendar
* the mask should contain '*'
*/
if (DateTimeNullable.class.isAssignableFrom(vc)){
DateTimeNullable dtn = (DateTimeNullable)value;
if (dtn.asDate().getTime()==DateTimeData.GREGORIAN_START_AS_LONG){
return super.valueToString(null);
}
}
if (dataValue.isNullable() && dataValue.isNull()) {