The Day of First Fruits begins on the day of the first sheaf waving of the first barley harvest and occurs on the 16th day of the 1st month of Abib/Nisan when the first fruits of the barley harvest are to be presented to the Lord.

The Day of First Fruits begins on the day of the first sheaf waving of the first barley harvest and occurs on the 16th day of the 1st month of Abib/Nisan.
Exo 34:25-26, Lev 23:10-14, the Late Passover Num 9:10-11. As the day of first fruits of the barley harvest are to be presented to the Lord (Lev. 23:10-11)
This is not a convocation day so work can be done on this day.
" The antitype was Resurrection Sunday which also occurred on 16 Abib / Nisan. Jesus was the first fruits of the resurrection, (1 Cor 15:20, 23, 2 Tim 2:6-8), the antitype. At His resurrection, Jesus also resurrected the saints whose tombs were opened (marked) at the moment of His death (Mat 27:52-53) as a type of the resurrection at the second coming. These saints were presented to the Father for His approval by Jesus in heaven (John 20:17) at the moment the barley sheaf was symbolically waved at the temple at the time of the morning sacrifice, the third hour (9 am).  
It is important to note that it was not a day of convocation (NOT A SABBATH) to the Jews, so there is no reason for it to be a sabbath in antitype (post-resurrection) to Christians. This is because the yearly festivals were not just commemorative in nature, but also prophetic, pointing to future holy events as fulfillments. To suggest a new Sunday holy day was instituted on resurrection day, is to say the yearly festival calendar appointed by God was in error, since it omits a weekly 1st day observance.
In Jewish Tradition, the period called the Omer begins on 16 Nisan and extends for the count of 50 days to Pentecost or Shavuot
Manna ceased to fall on this day (Josh 5:12)" (Biblical Feast Days, 2016).

Reference: The Biblical Feast Days. Retrieved on Feb. 29, 2016. http://biblelight.net/feasts.html