11/11/11 11:11 AM and 12/12/12 12:12 AM

will give an output of

1 month
1 day
1 hour
1 minutes
Do you want the difference between the month parts
Difference between the dateparts and the Difference
Between yearparts.. ....(That will be like what you have written above ...but seems useless..)

or

You want the exact Number of days,months,Years etc.. between two given dates in different format ?