This may however on occasions reasonably be the day when the staff member is needed to attend work for example to cover a sickness absence.
Fodd bynnag, mae’n rhesymol y gall hyn fod, o dro i dro, ar y diwrnod pan mae angen i’r aelod o staff weithio, er enghraifft yn lle rhywun sy’n absennol oherwydd salwch.