This Bible contradiction is from the Skeptic's Annotated Bible.

Verses

While it was still dark.

John 20:1 View context

The first [day] of the week cometh Mary Magdalene early, when it was yet dark, unto the sepulchre, and seeth the stone taken away from the sepulchre.

At sunrise.

Matthew 28:1 View context

In the end of the sabbath, as it began to dawn toward the first [day] of the week, came Mary Magdalene and the other Mary to see the sepulchre.

Mark 16:1-2 View context

And when the sabbath was past, Mary Magdalene, and Mary the [mother] of James, and Salome, had bought sweet spices, that they might come and anoint him.

And very early in the morning the first [day] of the week, they came unto the sepulchre at the rising of the sun.