Syslog timestamp

[Madhukar Thota]

How to convert Both RFC5424 and RFC3164 syslog timestamp attribute to type
to long.

Will some thing like this works?

${syslog.timestamp:toDate('MMM d HH:mm:ss'):toNumber():or(
   ${syslog.timestamp:toDate("yyyy-MM-dd'T'HH:mm:ss.SZ"):toNumber()}
):or(
   ${syslog.timestamp:toDate("yyyy-MM-dd'T'HH:mm:ss.S+hh:mm"):toNumber()}
)}