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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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closed as off-topic by curiousdannii, Affable Geek, Matt Gutting, JustinY, fredsbend Jan 27 '15 at 5:48

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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
I'm voting to close this question as off-topic because it is about culture, not Christianity. – curiousdannii Jan 26 '15 at 12:39
Where do you find that "Monday is the first day of the week"? – Mr. Bultitude Jan 26 '15 at 14:57
The true and correct order is left to right. – fredsbend Jan 27 '15 at 5:43

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 Dec 11 '13 at 2:07

The true seventhday of the week is sabbath(saturday)even jesus christ went to church on the seventhday of the week

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Jesus would've gone to a synagogue or the temple, not a church building! – curiousdannii Jan 26 '15 at 12:40
Welcome to C.SE. When you get the chance, please check out our tour and specifically How we are different than other sites. This answer properly reflects a Seventh-Day Adventist perspective, but neither identifies it as such, nor does it deal with alternatives. That said, this question isn't really the kind we normally deal with here either - it is a poor fit because it is what we call a "truth" question. – Affable Geek Jan 26 '15 at 18:54
Welcome to the site. We are glad you decided to participate. Please see What this site is about and How this site is different to help you learn how the site works. Also see the help center and take the tour to learn the site functions. I hope to see you post again soon. – fredsbend Jan 27 '15 at 5:56

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