SMC resets not helping MBP charge.

Macbook Pro is 2 years old, and it has recently started spontaneously shutting off, blowing fans, etc. The AC cord is as far as I can tell in good condition (original power supply). Pro tends to shut off the moment it fails to receive a charge. Alternately, it also shuts off when I try to change outlets and it receives power for a couple seconds and then it blacks out. Each time I re-boot it, the computer doesn't recognize the date or time (usually picks 31 December, 1999). I had at one point used a spare replacement charger, but after not using it for a couple months when I tried it out my MBP wouldn't recognize it so when I tested my original charger it was fine. MBP is current on all updates and I've tried doing SMC resets and it hasn't helped. What options do I have?

From what you've mentioned and described so far has me believing that you have a short in either your battery, battery cable/connection or your power port.
Since your RTC (real time clock) keeps resetting it's date and not keeping the date you input makes me come to the conclusion you have a short.
In a pc notebook, there is also a built in battery on the motherboard/logic board to keep memory of the time and configuration of the pc.  Not a 100% sure if this is the same case on a MB since I've never taken one apart.
Best solution is to take it to the Apple Store and have your battery, battery connection and power port inspected.  Bring your power adapter too just in case.

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