Wifi but no internet, wrong time, and mail client issues on macbook pro

A few things have recently come up that are worrying me...
1.  My wifi says it is connected to my apartments internet, and yet I dont have any internet.  Meanwhile. my roommate is able to get on the internet on his desktop PC.  I am afraid I changed something accidentally in my network settings.  It says something about unable to connect to DNS server?  (I am on campus using their internet to send this)
2.  My Clock is wrong.  Even when I reset the timezone, it is saying the time is 3:01 am when it is actualy 11:01 am. 
3.  LAstly, my mail client is no lponger getting my mail.  I am able to get all the messages on my iphone, but for some reason my macbook is not getting them. 
Any help is greatly appreciated.  THanks you much!

Your wifi is connected to the router but the modem may be faulty. Try reporting the modem.

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