 However, someone born during either Adar in a leap year will celebrate their birthday during Adar in a non-leap year, except that someone born on 30 Adar I will celebrate their birthday on 1 Nisan in a non-leap year because Adar in a non-leap year has only 29 days.During the Second Temple period, there was a Jewish custom to make a public proclamation on the first day of the lunar month Adar, reminding the people that they are to prepare their annual monetary offering to the Temple treasury, known as the half-Shekel.7 Adar (II in leap years) – 7th of Adar – some fast on this day in memory of the death of Moses

13 Adar (II in leap years) – Fast of Esther – on 11 Adar when the 13th falls on Shabbat – "(Fast Day)"
14 Adar (II in leap years) – Purim
14 Adar I (does not exist in non-leap years; Karaites celebrate in Adar II) – Purim Katan
15 Adar (II in leap years) – Shushan Purim – celebration of Purim in walled cities existing during the time of Joshua

17 Adar (II in leap years) – Yom Adar celebration feast