Issues while Executing ssh command from within Bash Script

I was trying to execute ssh command from bash script which will: 

1. Connect to the Host using ssh. 

2.  Execute the date command on it.

3.  Print the output of step 2 on screen. 

So basically I have several servers running on Amazon's EC2 and I want to actually see what's the date/time on all those servers for the reasons that I've seen some time drift on Amazon Instances. I have set up password less entry to remote host and also added host key to remote host.

Here is the code that I'm executing: 

inputfile="myfile.csv"

OLDIFS="$IFS"

IFS=","

while read IP; do

        echo "Instance $IP Date/Time is:" `ssh ubuntu@$IP date`

done < "$inputfile"

The problem is: When I execute this script it returns the date time for a few servers like sometimes 1, sometimes 2 or 4 and so on and then exits. 

After having spent hours on this problem finally I figured that ssh was consuming stdin. After adding a -n option to ssh all worked great. 

So here is how I should have actually used it: 

        echo "Instance $IP Date/Time is:" `ssh -n ubuntu@$IP date`

Easy.. Isn't It?