The lord's day is sunday.
Concerning the SABBATH Day…
SABBATH Day is now any day that an individual decides it to be.
The purpose of Sabbath day is to take a day in a week as a day of ‘Rest’ from your normal activities and to use this day to praise, honor, glory,
and WORSHIP Almighty God: Yahweh, the Father.
The day is a personally selected day but in most cases would align with a CORPORATE SABBATH day in which a COMMUNITY of people come together (A CHURCH) to do the praising, honouring, glorifucation,
and WORSHIP of Almighty God: Yahweh, the Father.
Notice that ‘Praise, Honor, and Glorification’ IS NOT WORSHIP!
And, that the day chosen as Sabbath is meant for the individual (and group) TO DO GOOD … meaning doing things that could not be fully carried out due to the normal commitments required on other days.
But, above all, notice that CORPORATE engagement is not a requirement on that CHOSEN SABBATH Day. It IS WORTHY but NOT ESSENTIAL.
A point to consider: How long ago was it that TWO DAYS were given over to NON-WORKING DAYS??
How did people manage with ONLY ONE DAY OFF from working??