Ellen White in Desire of Ages p.794 said:
As they heard this appointment, so definitely given, the disciples began to think of Christ’s words to them foretelling His resurrection. But even now they did not rejoice. They could not cast off their doubt and perplexity. Even when the women declared that they had seen the Lord, the disciples would not believe. They thought them under an illusion.
Trouble seemed crowding upon trouble.
On the sixth day of the week they had seen their Master die; on the first day of the next week they found themselves deprived of His body, and they were accused of having stolen it away for the sake of deceiving the people.
Two markers provided which are fixed. The sixth day of the week – When the lamb was slain. The first day of the week, when the he rose.
Mark 15 :42 Now when evening had come, because it was the Preparation Day, that is, the day before the Sabbath…
The third marker provided which is also fixed. The Sabbath day when he rested.
Christ died upon Passover the 14th day of the month. This is the sixth day of the week. He was resting upon the Sabbath. The 15th day. He rose upon the 16th day, the first day of the week.