More info about Girls Day Formular Schulbefreiung
Hinamatsuri is one of the five seasonal festivals (五節句, go-sekku) that are held on auspicious dates of the Chinese calendar: the first day of the first month, the third day of the third month, and so on. After the adoption of the Gregorian calendar, these were fixed on 1 January, 3 March, 5 May, 7 July, and 9 September. The festival was traditionally known as the Peach Festival (桃の節句, Momo no Sekku), as peach trees typically began to flower around this time. Although this is no longer true since the shift to Gregorian dates, the name remains and peaches are still symbolic of the festival.