In 586 BC, Daniel was taken captive by King Nebuchadnezzar of
Babylon. Daniel was given a vision by an angel sent from God,
detailing the future. The angel spoke of two distinct futures which
dealt with Israel and the Gentile world. The Jewish future laid out a
specific time line:

Seventy weeks are determined upon thy people and upon thy holy
city, to finish the transgression, and to make an end of sins, and to
make reconciliation for iniquity, and to bring in everlasting
righteousness, and to seal up the vision and prophecy, and to anoint
the most Holy.
Daniel 9:20

This one phrase is a summary of Jewish history, from Daniel's day to
the Return of Jesus Christ. The "seventy weeks" are measured in
units of years. For example, a week is 7 years. Therefore, the overall
time "decreed" to them was 490 years. It was the failure of the
Jewish people to keep a Sabbath year as well as a Sabbath day which
led to God's judgment upon them.

Know therefore and discern, that from the going forth of the
commandment to restore and to build Jerusalem unto the anointed
one, the prince, shall be seven weeks, and threescore and two
weeks: it shall be built again, with street and moat, even in
troublous times.
Daniel 9:25

In other words, using the issuance of the only decree that authorized
the rebuilding of both the city of Jerusalem and the Temple as a
starting point (given by Artaxerxes Longimanus of Persia), 483 years
later should bring us to the time of Jesus.

Sir Robert Anderson, a retired Scotland Yard Inspector of the late
19th century used a simple conversion process. The length of a year
varied by calendar, but a day was still a day. By dividing 483 years
by the 360 day/years of the Jewish calendar, he found that the overall
length of time should have been 173, 880 days. The Bible records the
date of the decree as the 20th year of the king's reign on the first day
of the month of Nisan. From 444 BC to AD 33 is 477 years, but AD
1 and BC 1 were the same year, so the actual length of time was 476
years. Multiplying 476 years by 365.242 (allowing for leap years)
comes to 173, 855days. But, 69 "weeks"--483 years--is 173,880
days. This figure is about 25 days short. Jesus rode into Jerusalem on
March 30, 33 AD. The starting point of the decree was issued March
5th. Add the missing 25 days and we come up with 173,880 days.
The prophecy predicted it to the exact day!  (Planet Earth, The Final
Chapter, Hal Lindsey, pp 79-80.)

And after threescore and two weeks shall Messiah be cut off, but not
for Himself: and the people of the prince that shall come shall
destroy the city and the sanctuary; and the end thereof shall be with
a flood, and unto the end of the war desolation are determined. And
he shall confirm the covenant with many for one week: and in the
midst of the week he shall cause the sacrifice and the oblation to
cease, and for the overspreading of abominations he shall make it
desolate, even until the consummation, and that determined shall be
poured upon the desolate.
Daniel 9:26-27

At this point 483 of the 490 years decreed for the Jewish people to
put an end to sin and anoint the most holy have passed. They were
the years up until the Messiah (Jesus) was cut off, or crucified.  The
final week of years will begin some time after the rapture of the
church.

For the Lord himself will descend from heaven with a cry of
command, with the archangel's call, and with the sound of the
trumpet of God. And the dead in Christ will rise first; then we who
are alive, who are left, shall be caught up together with them in the
clouds to meet the Lord in the air; and so we shall always be with
the Lord.  Therefore comfort one another with these words.
1 Thessalonians 4:16-18

But do not ignore this one fact, beloved, that with the Lord one day
is as a thousand years, and a thousand years as one day. The Lord
is not slow about his promise as some count slowness, but is
forbearing toward you, not wishing that any should perish, but that
all should reach repentance.  But the day of the Lord will come like
a thief, and then the heavens will pass away with a loud noise, and
the elements will be dissolved with fire, and the earth and the works
that are upon it will be burned up.
2 Peter3:8-10

Throughout the Bible, the Lord says "after two days" and "on the
third day" which many scholars now feel line up with the above
scriptural reference. When Peter says, "..that with the Lord one day
is as a thousand years, and a thousand years is as a day", he is
referring to 2000 years of 360 days from the day the Church Age
began. This was sometime around 33 AD. When one adjusts for
years of 360 days instead of 365 days/year, it is extremely close to
our time period now. No one knows the day or hour, but Jesus
teaches us to watch and to know the times and seasons.

But of that day and hour no one knows, not even the angels of
heaven, nor the Son, but the Father only. As were the days of Noah,
so will be the coming of the Son of man. For as in those days before
the flood they were eating and drinking, marrying and giving in
marriage, until the day when Noah entered the ark, and they did not
know until the flood came and swept them all away, so will be the
coming of the Son of man. Then two men will be in the field; one is
taken and one is left. Two women will be grinding at the mill; one
is taken and one is left. Watch therefore, for you do not know on
what day your Lord is coming.
Matthew 26:36-42

After the Church is raptured, God will then turn his focus back to the
Jewish people for the final "week" of years, called Daniel's 70th
week. This will also be the worst seven years of human history.

There is strong evidence that time is winding down before Christ
returns again. There is a definite urgency for unbelievers to seek out
the truth and accept Jesus as a personal Lord and Savior. He is the
only way to heaven and he will show you if you seek him with all
your heart!
Daniel's 70th Week