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https://github.com/basecamp/local_time

Rails engine for cache-friendly, client-side local time
https://github.com/basecamp/local_time

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Rails engine for cache-friendly, client-side local time

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README 

        
# Local Time



Local Time makes it easy to display times and dates to users in their local time. Its Rails helpers render `



## Installation



### Importmaps

1. Add `gem "local_time"` to your Gemfile.

2. Run `bundle install`

3. Run `bin/importmap pin local-time` to add the [local-time npm package](https://www.npmjs.com/package/local-time)

4. Add this to `app/javascript/application.js`



    ```js

    import LocalTime from "local-time"

    LocalTime.start()

    ```



### Webpacker

1. Add `gem "local_time"` to your Gemfile.

2. Run `bundle install`

3. Run `yarn add local-time`

4. Add this to `app/javascript/packs/application.js`



    ```js

    import LocalTime from "local-time"

    LocalTime.start()

    ```



## Example



```ruby

> comment.created_at

"Wed, 27 Nov 2013 18:43:22 EST -0500"

```



```erb

<%= local_time(comment.created_at) %>

```



Renders:



```html



```



And is converted client-side to:



```html



```



*(Line breaks added for readability)*



## Time and date helpers



```erb

<%= local_time(time) %>

```



Format with a strftime string (default format shown here)



```erb

<%= local_time(time, '%B %e, %Y %l:%M%P') %>

```



Alias for `local_time` with a month-formatted default



```erb

<%= local_date(time, '%B %e, %Y') %>

```



To set attributes on the time tag, pass a hash as the second argument with a `:format` key and your attributes.



```erb

<%= local_time(time, format: '%B %e, %Y %l:%M%P', class: 'my-time') %>

```



To use a strftime format already defined in your app, pass a symbol as the format.



```erb

<%= local_time(date, :long) %>

```



When using the `local_time` helper `I18n.t("time.formats.#{format}")`, `I18n.t("date.formats.#{format}")`, `Time::DATE_FORMATS[format]`, and `Date::DATE_FORMATS[format]` will be scanned (in that order) for your format.



When using the `local_date` helper, `I18n.t("date.formats.#{format}")`, `I18n.t("time.formats.#{format}")`, `Date::DATE_FORMATS[format]`, and `Time::DATE_FORMATS[format]` will be scanned (in that order) for your format.



Note: The included strftime JavaScript implementation is not 100% complete. It supports the following directives: `%a %A %b %B %c %d %e %H %I %l %m %M %p %P %S %w %y %Y %Z`



## Time ago helpers



```erb

<%= local_time_ago(time) %>

```



Displays the relative amount of time passed. With age, the descriptions transition from {quantity of seconds, minutes, or hours} to {date + time} to {date}. The `



Examples (in quotes):



* Recent: "a second ago", "32 seconds ago", "an hour ago", "14 hours ago"

* Yesterday: "yesterday at 5:22pm"

* This week: "Tuesday at 12:48am"

* This year: "on Nov 17"

* Last year: "on Jan 31, 2012"



## Relative time helpers



Preset time and date formats that vary with age. The available types are `date`, `time-ago`, `time-or-date`, and `weekday`. Like the `local_time` helper, `:type` can be passed a string or in an options hash.



```erb

<%= local_relative_time(time, 'weekday') %>

<%= local_relative_time(time, type: 'time-or-date') %>

```



**Available `:type` options**



* `date` Includes the year unless it's current. "Apr 11" or "Apr 11, 2013"

* `time-ago` See above. `local_time_ago` calls `local_relative_time` with this `:type` option.

* `time-or-date` Displays the time if it occurs today or the date if not. "3:26pm" or "Apr 11"

* `weekday` Displays "Today", "Yesterday", or the weekday (e.g. Wednesday) if the time is within a week of today.

* `weekday-or-date` Displays the weekday if it occurs within a week or the date if not. "Yesterday" or "Apr 11"



## Configuration



**Internationalization (I18n)**



Local Time includes a [set of default `en` translations](lib/assets/javascripts/src/local-time/config/i18n.coffee) which can be updated directly. Or, you can provide an entirely new set in a different locale:



```js

LocalTime.config.i18n["es"] = {

  date: {

    dayNames: [ … ],

    monthNames: [ … ],

    …

  },

  time: {

    …

  },

  datetime: {

    …

  }

}



LocalTime.config.locale = "es"

```



> [!NOTE]

> The "default" keys in the i18n configuration object are used for translations in LocalTime's `RelativeTime` module. They are not used to determine which format is rendered when none is provided. See https://github.com/basecamp/local_time/issues/128 for details.



**24-hour time formatting**

Local Time supports 24-hour time formats out of the box.



To use this feature, configure the library to favor `data-format24` over `data-format` attributes:



```js

LocalTime.config.useFormat24 = true

```



The library will now default to using the `data-format24` attribute on `



The included Rails helpers will automatically look for 24h variants of named formats.

They will search for `#{name}_24h` in [the same places](#time-and-date-helpers) the regular name is looked up.



This is an example of what your app configuration might look like:



```ruby

Time::DATE_FORMATS[:simple] = "%-l:%M%P"

Time::DATE_FORMATS[:simple_24h] = "%H:%M"

```



When `:type` is set to `time-ago`, the format is obtained from the `I18n` [configuration](#configuration).



In practice, you might set `config.useFormat24` to `true` or `false` depending on the current user's configuration, before rendering any `



## Contributing

Please read [CONTRIBUTING.md](./CONTRIBUTING.md).