Question

In log4j you could use a date pattern of %d{DDD:HHmmss} where the DDD would be the Day Of Year. I need to do an equivalent type of pattern in our C# app and I cannot figure out how to get this working. DataTime ToString doesn’t seem to have a formatter for Day Of Year but it does have a property for it call DateTime.DayOfYear. Anyone know how to get my date pattern set with day of year in log4net? Any advice is much appreciated.

To be clearer, I am really trying to find a log4net pattern to use in my App.Config that will format the date part of the output in the logfile. To wit in my App.Config within my appender I have:

<layout type="log4net.Layout.PatternLayout">
  <conversionPattern value="%d{MMdd-HHmmss} %-5.5p %c{1}:%L - %m%n" />
</layout>

This outputs something like:

0319-175824 INFO  Program:33 - Entering Main Method

Would like it to output:

078-175824 INFO  Program:33 - Entering Main Method

Answer 1

You could create your own implementation of DateTimeDateFormatter that outputs the format you require.

FormatDate looks like the method you would want to override.

Alternatively, you could inject a property containing DateTime.DayOfYear and reference it using the property syntax %property{doy}

log4net.GlobalContext.Properties["doy"] = DateTime.DayOfYear;