Dates are silently ignored

[njlg]

It seems like Issue #92 has come back.

var w = require('winston');
var d = new Date();

w.log('Found %s at %s', 'error', d);
// prints "Found error at %s"

console.log('Found %s at %s', 'error', d)
// prints "Found error at Tue Jan 20 2015 10:14:26 GMT-0800 (PST)"

[indexzero]

This is definitely a bug, but you also need to specify a log level. You can also work around it for now by doing:

winston.log('info', 'Found %s at %s', 'error', (new Date() + ''));

or use a method on Date like d.toISOString().'

[indexzero]

This turned out to be really tricky, but it will come in winston@2.0.0 later this week.