| 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).



How did Esther aquire the right to defeat Haman?
When she invited the king to a banquet she asked that Haman also attend.
At that feast the king gave her "half of the kingdom". That gave her the ruling rights of 63.5 nations. Not quite enough to carry out her plan. Soon
She invited them to another banquet. Then also, she was presented with "half of the remaining nations, giving her a realm consisting of 95.25 nations.
Now that she controlled 95.25 nations, she was in a position to beat Haman. Because Haman in gematria value is only 95.
Smart woman, was Esther.