Feast of Unleavened Bread

The Chag HaMatzot in the sundown until the sundown.  

On the Hebrew calendar this seven-day festival is from the 15^th day of the first month to the 21^st (Leviticus 23:6). The first and last days of the Feast of Unleavened Bread are sanctified days, days to rest from work and attend “a set-apart convocation” or worship service (verses 7-8).