 The next day (i.e.the first day of "Dae" month) was then a day of celebration, and (at least in the 10th century, as recorded by Al-Biruni), the festival of the first day of "Dae" month was known as Ḵorram-ruz (joyful day) or Navad-ruz (ninety days [left to Nowruz]).Although the religious significance of the long dark night have been lost, the old traditions of staying up late in the company of friends and family have been retained in Iranian culture to the present day.