feat: locale support for date filter, #567 (#723)

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Jun Yang
2024-07-22 00:39:44 +08:00
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@@ -6,12 +6,15 @@ title: date
Date filter is used to convert a timestamp into the specified format.
* LiquidJS tries to conform to Shopify/Liquid, which uses Ruby's core [Time#strftime(string)](https://www.ruby-doc.org/core/Time.html#method-i-strftime). There're differences with [Ruby's format flags](https://ruby-doc.org/core/strftime_formatting_rdoc.html):
* `%Z` (since v10.11.1) works when there's a passed-in timezone name from `LiquidOption` or in-place value (see TimeZone below). If passed-in timezone is an offset number instead of string, it'll behave like `%z`. If there's none passed-in timezone, it returns [the runtime's default time zone](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/resolvedOptions#timezone).
* `%Z` (since v10.11.1) is replaced by the passed-in timezone name from `LiquidOption` or in-place value (see TimeZone below). If passed-in timezone is an offset number instead of string, it'll behave like `%z`. If there's none passed-in timezone, it returns [the runtime's default time zone](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/resolvedOptions#timezone).
* LiquidJS provides an additional `%q` flag for date ordinals. e.g. `{{ '2023/02/02' | date: '%d%q of %b'}}` => `02nd of Feb`
* Date literals are firstly converted to `Date` object via [new Date()][jsDate], that means literal values are considered in runtime's time zone by default.
* The format filter argument is optional:
* If not provided, it defaults to `%A, %B %-e, %Y at %-l:%M %P %z`.
* The above default can be overridden by [`dateFormat`](/api/interfaces/LiquidOptions.html#dateFormat) LiquidJS option.
* LiquidJS `date` supports locale specific weekdays and month names, which will fallback to English where `Intl` is not supported.
* Ordinals (`%q`) and Jekyll specific date filters are English-only.
* [`locale`](/api/interfaces/LiquidOptions.html#locale) can be set when creating Liquid instance. Defaults to `Intl.DateTimeFormat().resolvedOptions.locale`).
### Examples
```liquid