Is there a %date{xxx} that can give me the seconds since epoch?

[ecerulm-st]

From https://logback.qos.ch/manual/layouts.html I can see that I can use %date{xxx} where xxx is a java.time.format.DateTimeFormatter . But it DateTimeFormatter does seem to have any way to output "epoch seconds", does it?

I'm after something like the configuration below, specifically the timestampSeconds field:

    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
            <providers>
                <timestamp />
                <pattern>
                    <pattern>
                        {
                        "timestampSeconds": "%date{SECONDS_SINCE_EPOCH}",
                        "timestampNanos":"%date{n}"
                        }
                    </pattern>
                </pattern>
                <logLevel>
                    <fieldName>severity</fieldName>
                </logLevel>

                <loggerName />
                <message />
                <mdc />
                <stackTrace />
            </providers>
        </encoder>
    </appender>

I've tried with

                <timestamp>
                    <!-- https://github.com/logfellow/logstash-logback-encoder?tab=readme-ov-file#customizing-timestamp -->
                    <fieldName>timestampSeconds</fieldName>
                    <pattern>[UNIX_TIMESTAMP_AS_NUMBER]</pattern>

                </timestamp> 

but unfortunately the UNIX_TIMESTAMP_AS_NUMBER gives milliseconds from the epoch and not seconds from the epoch and I don't see any way to convert that to seconds from the config

Is there any way to get the epoch seconds from %date or anywhere else?

[ecerulm]

I wrote #967 to add %date{EPOCH_SECONDS} and %date{EPOCH_MILLIS}