In Nepal, there is a festival equivalent to Mother's Day, called Mata Tirtha Aunsi ("Mother Pilgrimage New Moon"), or Mata Tirtha Puja ("Mother Pilgrimage Worship"). It is celebrated according to the lunar calendar. It falls on the last day of the dark fortnight in the month of Baishakh which falls in April–May (in 2015, it will occur on 18 April). The dark fortnight lasts for 15 days from the full moon to the new moon. This festival is observed to commemorate and honor mothers, and it is celebrated by giving gifts to mothers and remembering mothers who are no more.