When should one give out zakat-ul-fitr? 

- According to Hanafi scholars, zakat-ul-fitr becomes obligatory upon the arrival of dawn of the day of 'Eid.

- Shafi'i and Hanbali scholars maintained that its payment becomes obligatory upon sunset of the last day of Ramadan.

- Maliki and Hanbali scholars permitted its payment two days before its time due to the words of Ibn 'Umar (may God be pleased with them both) who said, "They [the Companions] used to give out zakat-ul-fitr one or two days before the 'Eid."

And God Almighty knows best.