Dan 12:1 And at that time shall Michael stand up, the great prince which standeth for the children of thy people: and there shall be a time of trouble, such as never was since there was a nation [even] to that same time: and at that time thy people shall be delivered, every one that shall be found written in the book.

Michael is the angel who oversees Israel. Michael and his angels will fight Satan and his angels, and they will cast Satan and his angels out of heaven (Revelation 12:7-9). Satan will return to earth in fury, for he'll know that his days are numbered. At this time the Antichrist sets up his throne in Jerusalem and breaks the covenant with Israel. The Great Tribulation will begin. It will last for three and one-half years and will be the second half of the final 7-year period prophesied earlier (Daniel 9:27). It will be the worst time the world will ever know (Matthew 24:21).

Dan 12:2 And many of them that sleep in the dust of the earth shall awake, some to everlasting life, and some to shame [and] everlasting contempt.

This verse may refer to the second resurrection (Ephesians 4:8-10, 1 Peter 3:18-20, Matthew 27:52-53, Isaiah 61:1, II Corinthians 5:1-8, Revelation 20:5-6). This verse could refer instead to the resurrection of the nation Israel (Ezekiel 37:1-14).

Dan 12:3 And they that be wise shall shine as the brightness of the firmament; and they that turn many to righteousness as the stars for ever and ever.

"The fear of the LORD [is] the beginning of wisdom: a good understanding have all they that do [his commandments]: his praise endureth for ever." Psalm 111:10

Dan 12:4 But thou, O Daniel, shut up the words, and seal the book, [even] to the time of the end: many shall run to and fro, and knowledge shall be increased.

The Holy Spirit has opened up our understanding of the Book of Daniel in these last days, because the information in it wasn't for earlier times. God told John not to seal the Book of Revelation and even promised a blessing to those who would read and understand it (Revelation 1:3, 22:10).

Dan 12:5 Then I Daniel looked, and, behold, there stood other two, the one on this side of the bank of the river, and the other on that side of the bank of the river.
Dan 12:6 And [one] said to the man clothed in linen, which [was] upon the waters of the river, How long [shall it be to] the end of these wonders?

Jesus was the "man" clothed in linen. The "men" were probably angels.

Dan 12:7 And I heard the man clothed in linen, which [was] upon the waters of the river, when he held up his right hand and his left hand unto heaven, and sware by him that liveth for ever that [it shall be] for a time, times, and an half; and when he shall have accomplished to scatter the power of the holy people, all these [things] shall be finished.

A "time" is a year, "times" is two years, and "an half time" is half a year. This equals three and one-half years

(Revelation 10:5-6).

Dan 12:8 And I heard, but I understood not: then said I, O my Lord, what [shall be] the end of these [things]?
Dan 12:9 And he said, Go thy way, Daniel: for the words [are] closed up and sealed till the time of the end.

The Book of Daniel was to be sealed until these end times we're living in today.

Dan 12:10 Many shall be purified, and made white, and tried; but the wicked shall do wickedly: and none of the wicked shall understand; but the wise shall understand.
Dan 12:11 And from the time [that] the daily [sacrifice] shall be taken away, and the abomination that maketh desolate set up, [there shall be] a thousand two hundred and ninety days.

The Bible doesn't reveal what will happen during the 30 days between the 1,260th and 1,290th day at the end of the Great Tribulation.

Dan 12:12 Blessed [is] he that waiteth, and cometh to the thousand three hundred and five and thirty days.
Dan 12:13 But go thou thy way till the end [be]: for thou shalt rest, and stand in thy lot at the end of the days.

In the 45 days between the 1,290th and 1,335th day, Jesus will judge all the nations of the earth. Those who are spared until the 1,335th day will be allowed to enter into the glorious Kingdom Age with Jesus (Matthew 25:31-46).