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Monday is the first day of the week, yet the Bible says that the first day of the week is Sunday. When the changes in our calendar were made? Why?

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@ Tomas Where do you find that the first day is Sunday in the Bible? –  Bye Nov 30 '13 at 16:46

3 Answers 3

Gregorian calendar, which is the most widely used international calendar today, was introduced by Pope Gregory XIII in 1582. When the New Testament was written, Gregorian calendar was not yet known. The writers of New Testament were mostly Jews and they used Jewish Calendar, which is different from Gregorian calendar.

When the Bible say "first day of the week", it means the first day after Sabbath in Jewish Calendar. The first day after Sabbath is called Sunday in Gregorian Calendar, which is the seventh day. Thus,

First Day of the week in Jewish Calendar = Seventh Day of the week in Gregorian Calendar


Sunday = Jewish First day
Monday = Jewish Second day
Tuesday = Jewish Third day
Wednesday = Jewish Fourth day 
Thursday = Jewish Fifth day
Friday = Jewish Sixth day
Saturday = Sabbath

Source: Hebrew calendar

The Early Christians used to meet together on Sunday(the first day of the week) and celebrated the Eucharist together. That is why Christians today come together on Sunday to worship God and to participate in the Lord's Supper.

On the first day of the week we met to break bread and eat together. (Acts 20:7, NIV)

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I don't think the Gregorian reform of the calendar involved changing the beginning of the week from Sunday to Monday. The main change for the future was that years with numbers divisible by 100 were no longer to be leap years unless they were divisible by 400. There was also a one-time adjustment, skipping 11 days of the calendar, to compensate for the discrepancy that had developed between the Julian calendar and astronomical phenomena like the equinoxes. –  Andreas Blass Nov 30 '13 at 15:21
@AndreasBlass Do you mean to say that Sunday is Sabbath? –  Mawia Nov 30 '13 at 16:03
I didn't say (or mean to say) anything about sabbath. Nor did the question say anything about sabbath. –  Andreas Blass Nov 30 '13 at 16:46

Most calendars, at least here in the U.S., begin the week with Sunday, not Monday. I suspect that the reason some calendars begin with Monday is that they are oriented toward the work week and that they want to keep the two weekend days together (because many people think of the weekend as a sort of unit).

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I think the question is asking for the Biblical counting of week days, not how the people in U.S. are counting. –  Mawia Nov 30 '13 at 16:52

Early Christians used to meet together on the first day of the week Acts 20;7 - does it start on saturday night? As the jewish days went from sun down to sun down... therefore using this logic the first day started on saturday night? or when the Bible was trans;lated into what we know and love used the gregorian calendar?

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Welcome to the site. As a new visitor, I'd recommend checking out the following two posts, which are meant to help newcomers "learn the ropes": help page and How we are different than other sites? Also, this doesn't really answer the question. It looks like it should be a comment or another question, but you haven't yet earned enough to leave comments. (Again, see the help page.) Hopefully, soon! –  David Stratton Dec 11 '13 at 2:07

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