By default entlib uses GMT time for timestamps. If you're in New Zealand this means the timestamps on your log entries are all incorrect. This is something that I always forget how to do but it is very easy to correct. If you have a text formatter that looks similar to:
<formatters>
<add template="Timestamp: {timestamp}

Message: {message}

Category: {category}
)}"
type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter,
Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.1.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a" name="Text Formatter" />
</formatters>
You simply need to change the {timestamp} to {timestamp(local)} and it will use the server timezone. Easy.