Partitioning on Date

Hi Guys,I'm looking to partition a big table into years.I have a big table with data going back to 2001.I need to partition this into file groups each for the last 5 years, and the rest into its own file groupI was going to convert the inherent date time field into the format int(yyyymmdd) and partition on that field.Is this an acceptable way to achieve this? Is there a better way to partition on date? [not time]CheersAlex