Celebrating Passover on Nisan 14

I found additional proof that Passover should be celebrated on Nisan 14, which confirms my research. Why aren't the Jews, God's chosen people not celebrating Passover? I  found additional proof that Passover should be observed on Nisan 14, which is sunset on Sunday, April 9, 2017. I celebrated Passover today. Did you? Why are the Jews, God's chosen people not observing the LORD's feast correctly? Here's the video "Is Passover on the 14th or 15th for Christians? Here's the must watch video at
https://youtu.be/H_LRXJztBFA?list=UUOuL5Q2Xi9HZqU6GivhxveQ and an article at http://www.cogwriter.com/passover_on_the_fourteenth_or_fifteenth.htm