Retrieve historic changesets from tfs

Following code retrieves changesets between given dates from tfs:

   
        public static List GetChangesetsBetweenDates(string sourceControlPath, DateTime fromDate, DateTime toDate)
        {
            TfsTeamProjectCollection projectCollection = TfsManager.Instance.ProjectCollection;

            VersionControlServer versionControl = projectCollection.GetService();

            VersionSpec versionFrom = GetDateVSpec(fromDate);
            VersionSpec versionTo = GetDateVSpec(toDate);

            IEnumerable results = versionControl.QueryHistory(
                sourceControlPath,
                VersionSpec.Latest,
                0,
                RecursionType.Full,
                null,
                versionFrom,
                versionTo,
                int.MaxValue,
                true,
                true);
            List changesets = results.Cast().ToList();
            return changesets;
        }

        private static VersionSpec GetDateVSpec(DateTime date)
        {
            string dateSpec = string.Format("D{0:yyy}-{0:MM}-{0:dd}T{0:HH}:{0:mm}", date);
            return VersionSpec.ParseSingleSpec(dateSpec, "");
        }