Prefix for printing DateTime with miliseconds ? about zlogger HOT 2 CLOSED

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from zlogger.

If the issue is still valid for you, the only solution I found it working is to use the following prefix formatting:

    logging.AddZLoggerConsole(options =>
    {
        var prefixFormat = ZString.PrepareUtf8<int, int, int, int, int, int, int, LogLevel>("{0:D4}-{1:D2}-{2:D2} {3:D2}:{4:D2}:{5:D2}.{6:D3} [{7}] ");
        options.PrefixFormatter = (writer, info) =>
        {
            var nowLocalTime = info.Timestamp.DateTime.ToLocalTime();
            prefixFormat.FormatTo(ref writer,
                nowLocalTime.Year,
                nowLocalTime.Month,
                nowLocalTime.Day,
                nowLocalTime.Hour,
                nowLocalTime.Minute,
                nowLocalTime.Second,
                nowLocalTime.Millisecond,
                info.LogLevel);
        };
    });

This is because Zlogger uses Utf8Formatter.TryFormat from Microsoft, and this function does not support formatting dates with other formats apart from what is documented at Utf8Formatter.TryFormat. So instead of using DateTime, I deconstruct the current date time in its constituents (year, month, day, hours, etc.) and then use one of the PrepareUtf8 generic overloads to format those integers in date format. D4, D2, D3 formats for integers are passed by the library directly to Utf8Formatter.TryFormat to format with 4, 2 or 3 leading digits in total including the leading zero if necessary.

The above code produces the following log messages:

2022-12-30 01:09:07.298 [Information] Now listening on: http://localhost:5178
2022-12-30 01:09:07.299 [Information] Application started. Press Ctrl+C to shut down.
2022-12-30 01:09:07.299 [Information] Hosting environment: Development

from zlogger.