Serilog file name UTC Date format

Question

I want to use UTC DateTime in Serilog filename. I am using the below configuration for serilog in my appseting.json file.

"Serilog": {
    "Using": [],
    "MinimumLevel": {
      "Default": "Information",
      "Override": {
        "Microsoft": "Warning",
        "System": "Warning"
      }
    },
    "Enrich": [
      "FromLogContext",
      "WithMachineName",
      "WithProcessId",
      "WithThreadId"
    ],
    "WriteTo": [
      {
        "Name": "Console"
      },
      {
        "Name": "File",
        "Args": {
          "path": "Logs\\log-.json",
          "formatter": "Serilog.Formatting.Compact.CompactJsonFormatter, Serilog.Formatting.Compact",
          "rollingInterval": "Hour",
          "shared": true
        }
      }
    ]
  }

and below is the program.cs file code which I use for serilog.

public static void Main(string[] args)
        {

            var configuration = new ConfigurationBuilder()
                .AddJsonFile("appsettings.json").Build();

            Log.Logger = new LoggerConfiguration()
                .ReadFrom.Configuration(configuration)
                .CreateLogger();
            try
            {
                CreateHostBuilder(args).Build().Run();
            }
            catch (Exception e)
            {
                Log.Fatal(e, "The Application failed to start correctly");
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args).UseSerilog()
                .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); });

Currently, serilog producing the log file name as log-2020091323.json which is not UTC DateTime. I'm using asp.net core 3.1.

Does this answer your question? [Is it possible to get Timestamp in output template as DateTimeKind.Utc?](https://stackoverflow.com/questions/35369491/is-it-possible-to-get-timestamp-in-output-template-as-datetimekind-utc) — Ruben Bartelink, Sep 14 '20 at 06:11
Thanks, @RubenBartelink. But I need the UTC date in the file name, not in the file content. It's maybe creating an extra property in file content call UtcTimestamp. — Md. Mustafizur Rahman, Sep 14 '20 at 06:21
Sorry picked too quick - I think I saw one of those pre-asnwered in the search too? — Ruben Bartelink, Sep 14 '20 at 06:30

score 2 · Answer 1 · answered Sep 20 '20 at 10:30

You can use Install-Package Serilog.Sinks.Map nuget package and configet it in Serilog setup to archive this as in below code example

Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Information()
    // Ex: UtcDateTime value '202009201010'
    .WriteTo.Map("UtcDateTime", DateTime.UtcNow.ToString("yyyyMMddHHmm")
                    , (UtcDateTime, wt) => wt.File($"logs/log-{UtcDateTime}.txt"))
    .CreateLogger();

Log.Information("Hello, Serilog!");

Log.CloseAndFlush(); // Ex: log file name 'log-202009201010.txt'

This code save logs to new file each minute if you need to configure it for each hour use DateTime.UtcNow.ToString("yyyyMMddHH"), or DateTime.UtcNow.ToString("yyyyMMdd") for each day.

Serilog file name UTC Date format

1 Answers1