Why most Christians say Jesus’ resurrection was on a Sunday?

> John 20:1
Now on **the first day of the week** Mary Magdalene came to > the tomb early, while it was still dark, and saw that the stone had > been taken away from the tomb. If in the point of view of Adventist, to me it seems suitable when they say *"Jesus resurrection is on Sunday"*, because in the pov of Adventist - Sunday is the first day of the week. So, if other Christians say that the first day of the week is Monday,
then isn't *"the resurrection day is on Monday"* more suitable ? ---------- ADDITION: In simple way :
Q: On what date Jesus resurrected ?
A: 17 Nisan 3793 = 4 April 0033 (from the internet, Gregorian Calendar)
Q: What day is Jesus rose from the death?
A: The first day of the week
My conclusion :
17 Nisan 3793 / 4 April 0033 = The first day of the week
According to the Christian Adventist:
What day is the 7th day of the week to rest? (Sabbath)
What day is the first day of the week?
What day Jesus die ? What day Jesus resurrection day ? According to the Non-Adventist Christian:
What day is the 7th day of the week to rest? (Sabbath)
What day is the first day of the week?
What day Jesus die ? What day Jesus resurrection day ?