But why are they expressed as 42 months in one verse and differently in the very next verse as 1260 days? It is because on the timeline they are are not exact equivalent to each other.
1260 days + 3.5 days + 1256.5 days (expressed as 42 months) = 2520 days, the seven years.
Because the 42 months is part of the 1260 not an addition to it ... that is it falls within the 1260. Study the book of Daniel (Daniel 7) along with or in relation to Revelation. Revelation is not in chronological order. I'll try and further explain.
THE 1260 DAYS OF DANIEL 7
The number 1260 is not just a rough figure because it is mentioned seven
times in the Bible in
various different ways:
Daniel 7:25 "a time, times and half a time"
Daniel 12:7 "a time, times and half a time"
Revelation 11:2 "42 months"
Revelation 11:3 "1260 days"
Revelation 12:6 "1260 days"
Revelation 12:14 "a time, times and half a time"
Revelation 13:5 "forty-two months"
It can be shown that all these texts are referring to the same period of
time:
A time is one year = 360 days
Times are two years = 720 days
Half a time is half a year = 180 days
-----------------------------------------
Therefore the total = 1260 days
A month in prophecy is equal to 30 days, therefore forty-two months is
equal to 42 x 30 = 1260 days.
So we can see that these seven texts are talking about the same period of
time, but what does it mean?
First of all, the prophecy is not referring to literal days. In prophecy a
day is sometimes used to represent a year, and that seems to be the case
here. (See Numbers 14:34 and Ezekiel 4:6) So the prophecy is talking about
a period of 1260 years.
If we now go back to Daniel 7:25 we can see that it is the power of the
Little Horn which will control the "saints" for this period of time. We
have already suggested that the Little Horn represents "Papal Rome" so does
our figure of 1260 years fit in with the records of history?
Papal Rome defeated the last of its major enemies (the Ostrogoths) in the
year 538 A.D. when Emperor Justinian's decree came into effect. Throughout
the Dark Ages the Catholic church was the most powerful political force in
the whole world, and it used its power for political and financial gain as
well as for religious purposes. Many millions were persecuted and put to
death - "oppressing the saints of the Most High" as Daniel puts it.
However the power of the Papal Church came to an end when the armed forces
of Napoleon, under general Berthier marched into Rome and took the Pope
captive. This happened in the year 1798 A.D. surprisingly (or perhaps not
so surprisingly) exactly 1260 years after the Papacy came to power in 538
A.D.
God Bless.