Show a Bunyan raw stream that hacks 'rec.time' to a custom format, if desired.

hacktime.js

var bunyan = require('./');

function HackTimeStream(stream) {
    this.stream = stream || process.stderr;
}

HackTimeStream.prototype.write = function write(rec) {
    rec.time += 'wallawalla';
    this.stream.write(JSON.stringify(rec) + '\n');
};

var log = bunyan.createLogger({
    name: 'hacktime',
    streams: [
        {
            type: 'raw',
            stream: new HackTimeStream()
        }
    ]
});

log.info('hi')
log.info('bye')

output.txt

$ node hacktime.js  | bunyan
{"name":"hacktime","hostname":"danger0.local","pid":9295,"level":30,"msg":"hi","time":"Mon Sep 07 2015 21:09:25 GMT-0700 (PDT)wallawalla","v":0}
{"name":"hacktime","hostname":"danger0.local","pid":9295,"level":30,"msg":"bye","time":"Mon Sep 07 2015 21:09:25 GMT-0700 (PDT)wallawalla","v":0}