Timestamp helper

[erikjung]

Specifically to output the build date, we need some kind of helper that outputs a formatted version of new Date().

Possible example:

{{dateNow format="yyy-mm-dd"}}

[tylersticka]

FWIW, here's a helper I made that uses moment.js, I believe it works how you described because if context is null it should just return the current date (but I may be wrong about that):

/*
 * Format a date using Moment.
 * Usage: {{moment date format="MMMM YYYY"}}
 */

var Handlebars = require('handlebars'),
    moment = require('moment');

Handlebars.registerHelper('moment', function (context, block) {
  return moment(new Date(context)).utc().format(block.hash.format);
});

Ignore or borrow what you will!

[erikjung]

@tylersticka Thanks!

I ended up doing something slightly different in order to support optional date value input. Initially, this was indented to always output the value of new Date() with no input needed. I thought it might be nice to handle an input value if needed, and to supply a better formatting default.

module.exports = function (context, options) {
  var date = options ? context : new Date();
  var options = options || context;
  var format = options.hash.format || 'YYYY-MM-DD ';
  // http://momentjs.com/docs/#/displaying/
  return moment(date).utc().format(format);
}

Any of these use cases should work now:

{{moment}}
{{moment "2012-02-02"}}
{{moment format="YYYY"}}
{{moment "2014-05-06" format="YYYY-MM"}}