/***
* Called by computeJulianDay. Returns the default day (1-based) for the month,
* taking currently-set year and era into account. Will return the first day of the given
* era, if the current month is an ascension year and month.
/***
* Called by computeJulianDay. Returns the default day (1-based) for the month,
* taking currently-set year and era into account. Will return the first day of the given
* era, if the current month is an ascension year and month.