ListFiles.cs

[Authorize(Policy = "Administrator")]
public IActionResult ListFiles(string date)
{
    var model = new FilesViewModel();
    DateTime day;
    if (!string.IsNullOrEmpty(date))
    {
        day = DateTime.ParseExact(date, "yyyyMMdd", CultureInfo.InvariantCulture);
    }
    else
    {
        day = DateTime.UtcNow;
    }

    string todayDate = day.ToString("yyyyMMdd");
    string yesterday = day.AddDays(-1).ToString("yyyyMMdd");
    string tomorrow = day.AddDays(1).ToString("yyyyMMdd");

    model.Today = todayDate;
    model.TodayFormat = day.ToString("dd-MMM-yyyy");
    model.Yesterday = yesterday;
    model.Tomorrow = tomorrow;

    foreach (var item in _fileProvider.GetDirectoryContents(todayDate))
    {
        FileInfo f = new FileInfo(item.PhysicalPath);
        model.Files.Add(new FileDetails { Name = item.Name, FullPath = item.PhysicalPath, CreationTime = f.CreationTime, Size = f.Length });
    }
    return View(model);
}