Sunday or Saturday?

It is believed that believers would gather together on Sunday to break bread and share the Word. As it reads on Acts 20:7, in most of the different types of Bible translations. Yet, if we read a literal translation we get,

   |1722| on
   |1161| And
   |3588| the
   |3391| one
   |3588| of the
   |4521| Sabbath {day},
   |4863| having been assembled
   |3588| the
   |3101| followers
   |2806| to break
   |0740| bread,
   |3972| Paul
   |1256| reasoned
   |0846| to them,
   |3195| being about to
   |1826| depart
   |3588| on the
   |1887| next day.
   |3905| he continued
   |5037| And
   |3588| the
   |3056| message
   |3360| until
   |3317| midnight

By this, I get that most translations have followed the original 1611 addition KJV. Making Sunday, the day of Worship, or the day of rest. I am a student, that loves to learn and if I am mistaken, would like to be corrected. I ask this question because I saw a video that other day, that brought up some interesting points of view. With respect to certain doctrines of the Word of God. Will you please take a look at this video and help me to understand what I am not seeing or understanding: [The Mark Of The Beast Is NOT A Microchip! HD ](https://www.youtube.com/watch?v=Ei7_aJCsb_M&t=1881s) .