A helper to master time! Combining the powers of Assemble, Handlebars.js and Moment.js. This helper leverages Moment.js to provide ultimate control over manipulating time and dates in your templates.

Install the helper:

npm i handlebars-helper-moment --save-dev

Now add the helper to Assemble's options:

assemble: {
  options: {
    // Assemble will automatically resolve the path
    helpers: ['handlebars-helper-moment', 'foo/*.js']
  }
}

The moment.js lib has plenty of features and options, these examples are just the tip of the iceberg of what moment.js can do.

Remember that:

• \{{moment method=null}} means moment().method(), and
• \{{moment somedate method="something"}} means moment(somedate).method("something").

Also, the handlebars syntax does not allow you pass certain values (like arrays and objects) directly from the tag, so you may need to use YAML frontmatter or supply JSON/YAML data to run those.

YAML front matter is not required, but we'll use it hear to supply our example data for purposes of demonstration:

---
example: <%= new Date("Sun Jun 30 2011 01:53:23 GMT+0300 (EEST)") %>
exampletextdate: 'Sun, 30 Jun 2012 11:19:15 +0300'

inputformats: ["ddd, DD MMM YYYY HH:mm:ss ZZ", "MMMM YYYY"]

daysadd:
  days: 5
timeago:
  years: 5
duration:
  hours: 2
  minutes: 33}
---
Unix timestamp of now
\{{moment}}

Results in:

1372599296756

\{{moment format="HH:mm:ss"}}

Results in:

16:34:56

\{{moment example format="HH:mm:ss"}}

Results in:

01:53:23

\{{moment unixtimestamp format="HH:mm:ss"}}

Results in:

19:17:56

\{{moment example format="dddd, DD MMMM YYYY HH:mm:ss ZZ"}}

Results in:

Sunday, 30 June 2013 01:53:23 +0300

\{{moment example lang="fi" format="dddd, DD MMMM YYYY HH:mm:ss ZZ"}}

Results in:

sunnuntai, 30 kesäkuu 2013 01:53:23 +0300

Is the added date valid?

\{{moment example isValid=null}}

Results in:

true

\{{moment [exampletextdate,"ddd, DD MMM YYYY HH:mm:ss ZZ"] format="MMMM YYYY"}}

Results in:

June 2013

When multiple formats are used, moment.js attempts to use the "correct" one

\{{moment [exampletextdate,formats] format="MMMM YYYY"}}

Results in:

June 2013

\{{moment example UTC=null format="dddd, DD MMMM YYYY HH:mm:ss ZZ"}}

Results in:

Saturday, 29 June 2013 22:53:23 +0000

Example: get week of year, depends on lang (see moment.js documentation for more details)

The week number in Finland is \{{moment example lang="fi" week=null}}

Results in:

The week number in Finland is 26

See the moment.js/manipulating documentation for more details.

\{{moment example format="dddd"}}-\{{moment example add=daysadd format="dddd"}}

Results in:

Sunday-Friday

\{{moment example subtract=timeago format="YYYY"}}-\{{moment example format="YYYY"}}

Results in:

2008-2013

\{{moment example startOf="month" format="dddd, DD MMMM YYYY HH:mm:ss ZZ"}}

Results in:

Saturday, 01 June 2013 00:00:00 +0300

\{{moment example endOf="week" format="dddd, DD MMMM YYYY HH:mm:ss ZZ"}}

Results in:

Saturday, 06 July 2013 23:59:59 +0300

After this page is rendered, the week will end \{{moment endOf="week" fromNow=null}}

Results in:

After this page is rendered, the week will end in 6 days

This helper was coded \{{moment from=example}}

Results in:

This helper was coded in 15 hours

The coding started \{{moment example calendar=null}}

Results in:

The coding started Today at 1:53 AM

The difference between those two moments is \{{moment diff=example}}

Results in:

The difference between those two moments is 52893769

This month has \{{moment daysInMonth=null}} days

Results in:

This month has 30 days

This month has \{{moment daysInMonth=null}} days

Results in:

This month has 30 days

The event will last \{{duration duration humanize=null}}

Results in:

The event will last 3 hours

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using grunt.

Mikko Tapionlinna

• github.com/Arkkimaagi

Copyright (c) 2014 Mikko Tapionlinna, contributors. Released under the MIT license

This file was generated on Sunday, May 4, 2014.