Event Year After Creation
Achashverosh ascends the throne of Persia
3392 (369 BCE)
Achashverosh's Feast, lasting 180 days
3395 (366 BCE)
Esther taken to Achashverosh's Palace
Tevet, 3399 (362 BCE)
Haman casts lots
Nissan, 3404 (357 BCE)
First decrees dispatched by Haman
Nissan 13, 3404 (357 BCE)
Three days' Fast ordered by Esther*
Nissan 14-16, 3404 (357 BCE)
Haman's downfall and execution by hanging*
Nissan 17, 3404 (357 BCE)
Second decrees, reversing the first
Sivan 23, 3404 (357 BCE)
Sadness turned to gladness; Haman's ten sons executed
Adar 13, 3405 (356 BCE)
Purim celebrations everywhere, except Shushan where a second day of reckoning is added
Adar 14, 3405 (356 BCE)
Purim celebration in Shushan
Adar 15, 3405 (356 BCE)
The Megillah recorded; Festival of Purim instituted for all generations
3406 (355 BCE)

*There is disagreement regarding this date. Our timeline follows the tradition cited in Talmud, Megillah 15a (see Rashi ad loc. for an alternative reading).