Some of us KNOW that the time of Jacob's trouble was the first coming of Christ. Daniel 12:1 IS Jacob's trouble.
Daniel 12:1-2 KJV
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.
[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.
Daniel 12:1-2 KJV
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.
[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.