People off and on *say* "NASA said this" or "scientists say that". I'm sure you've read many statements like that. But nothing like that has ever appeared on a nasa.gov webpage, or on any actual scientific website.
"When I research into when they last aligned and what happened I come across any different dates,"
That's because these websites are making it up. So they can make up any date they want.
The actual date the planets all lined up was... never.
The next date they will all line up is... never.
But even if they do, so what? Straight lines do not have magical properties.
"cause severe weather patterns due to the magnetic pull. "
Like most 2012 myths, that one violates the laws of physics. There is no "magnetic pull" from the planets. Their only influence on us is their gravity, and they are very far away so that the total gravitational pull would only raise the tides by 1/25 of a millimeter. You can calculate that with the actual laws of physics.
Nothing in the actual laws of physics says that "alignments" have magical properties, or that the planets can influence our weather.