Hi Serene ,
It all depends on what kind of a result you want ; do you want an answer rounded off either up or down , to the nearest month , or do you want a precise answer , down to two decimal places ?
If it is the former , what anand_babu has posted will do ; if it is the latter , it is somewhat more complicated.
Converting from text to date is done by using the DATEVALUE function , provided the text format follows your computer's default date format ; e.g. suppose we take the date 11/02/2013 ; this can be interpreted as either February 11 or November 2 , depending on whether your default date format is dd/mm/yyyy or mm/dd/yyyy.
The conversion from text to date will strictly follow your computer's default date format ; so if the intended date was February 11 , but your PC date format is mm/dd/yyyy , then the result of the conversion will be November 2.
Narayan