时间类型排序 NSComparisonResult

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *date = [dateFormatter dateFromString:[NSString stringWithFormat:@"%@",unreadmail[j][2]]];

NSDate *date1 = [dateFormatter dateFromString:[NSString stringWithFormat:@"%@",unreadmail[j+1][2]]];

 NSComparisonResult result = [date compare:date1];

NSComparisonResult result = [date compare:date1];

NSLog(@"date1 : %@, date2 : %@", oneDay, anotherDay);

if (result == NSOrderedDescending)

{

   //NSLog(@"Date1 is in the future"); //升

   return 1;

}

else if (result == NSOrderedAscending)

{

   //NSLog(@"Date1 is in the past"); //降

   return -1;

}

//NSLog(@"Both dates are the same");

return 0;