let's extract this into a lodash extension. update `src/lib/util/lodash-ext.coffee` and add something like an `lpad` function that pads numbers/strings. Then, at the top of this file (asset_vars.coffee), require lodash:

```javascript
_ = require('../util/lodash-ext')
```

and do something like:

```javascript
day: ->
  _.lpad((new Date).getDate(), 2) // returns "02"
```