public static DateTime GetLatestModifedEntryDateTime(IBlogDataService dataService, EntryCollection entries) { // Check to see if we should send a HTTP 304 letting the RSS client // know that they have the latest version of the feed DateTime latest = DateTime.MinValue; // need to check to see if the last entry value doesn't exist // if it doesn't loop through posts to get the latest date if (dataService.GetLastEntryUpdate() == DateTime.MinValue) { foreach (Entry entry in entries) { DateTime created = entry.ModifiedLocalTime; if (created > latest) latest = created; } } else { latest = dataService.GetLastEntryUpdate().ToLocalTime(); } // we need to check to see if a comment entry has occured // after the last entry update. If it has don't return 304 DateTime latestComment = dataService.GetLastCommentUpdate(); if ( ( latestComment != DateTime.MinValue ) && ( latest < latestComment.ToLocalTime() ) ) latest = latestComment.ToLocalTime(); return new DateTime(latest.Year, latest.Month, latest.Day, latest.Hour, latest.Minute, latest.Second); }