Did Christ rise on Easter Sunday? Or Good Saturday?

I'm still a newbie at the deeper learning of my Catholic faith & the other day someone from a church that does mass on Saturdays told me that Christ didn't resurrect on Sunday... I looked at this article (link below) and seen a very compelling argument that backed up what I was told. My question is how, or rather "Where" can I find it in the bible that Christ did resurrect on a Sunday and that we should celebrate mass on Sundays??

:confused:

Christ’s Resurrection Was NOT on Sunday