If your homegroup network password won't work on one computer, make a note of this.....check your date/time!

I had used the password previously with no problems (the other computers were already joined to the network) but one lone computer was giving me grief. It kept telling me that the password was incorrect. I knew without a doubt that the password was right, but it wouldn't accept it and join the homegroup. Turns out that it was the 21st of the month and I thought it was the 22nd when setting the date/time on the computer. Changed it to the correct day and it all worked! So, the big mystery is why did Windows 7 keep telling me the password was incorrect when in fact it was the date that was incorrect? Stupid computers.....