HomeController.cs

public class HomeController : AbpController
{
    private static readonly DateTime StartupTime = DateTime.UtcNow;
    private static readonly Stopwatch Stopwatch = Stopwatch.StartNew();

    public ActionResult Index()
    {
        return Redirect("~/swagger");
    }

    [HttpGet("health")]
    public ActionResult Health()
    {
        var currentTime = DateTime.UtcNow;
        var uptime = currentTime - StartupTime;

        var response = new
        {
            startupTime = StartupTime.ToString("yyyy-MM-ddTHH:mm:ss.fffZ"),
            currentTime = currentTime.ToString("yyyy-MM-ddTHH:mm:ss.fffZ"),
            uptimeMs = (long)uptime.TotalMilliseconds,
            uptimeFormatted = FormatUptime(uptime),
            uptimePreciseMs = Stopwatch.ElapsedMilliseconds,
            status = "UP",
        };
        return Ok(response);
    }

    private static string FormatUptime(TimeSpan uptime)
    {
        if (uptime.Days > 0)
        {
            return $"{uptime.Days}d {uptime.Hours}h {uptime.Minutes}m {uptime.Seconds}s";
        }
        else if (uptime.Hours > 0)
        {
            return $"{uptime.Hours}h {uptime.Minutes}m {uptime.Seconds}s";
        }
        else if (uptime.Minutes > 0)
        {
            return $"{uptime.Minutes}m {uptime.Seconds}s";
        }
        else
        {
            return $"{uptime.Seconds}s";
        }
    }
}