Vega: Support Intl Format Methods

[mhf-ir]

Problem: How do i use different type of calendar as y instead of default JS calendar system (gregorian)

As example of I need instead of hard coded calendar or formatted i need the standard

:globe_with_meridians:Intl.DateTimeFormat that currently support by many browsers

Here the official vega documentation:

{
  "data": {"url": "data/seattle-weather.csv"},
  "mark": "bar",
  "encoding": {
    "x": {
      "timeUnit": "month",
      "field": "date",
      "type": "ordinal",
      "axis": {"title": "Month of the year"}
    },
    "y": {
      "aggregate": "count",
      "type": "quantitative"
    },
    "color": {
      "field": "weather",
      "type": "nominal",
      "scale": {
        "domain": ["sun", "fog", "drizzle", "rain", "snow"],
        "range": ["#e7ba52", "#c7c7c7", "#aec7e8", "#1f77b4", "#9467bd"]
      },
      "legend": {"title": "Weather type"}
    }
  }
}

I think it's good to we have a key like:

{
  "timeUnit": "month",
  "i18n": {
    "l": "en-GB",
    "ca": "persian",
    "nu": "latn"
  }
}

new Intl.DateTimeFormat('en-GB-u-nu-latn-ca-persian').format(new Date());

More info https://mhf-ir.github.io/i18nplease/

[domoritz]

Thank you for raising the issue. We will need support for internationalization to Vega.

[jheer]

Thanks! For now, Vega provides only the support afforded by the d3-time-format library. It supports a level of internationalization through locale configuration, but is not as comprehensive. Definitely an area for future development.

[jheer]

In addition to Intl.DateTimeFormat, we should also look at Intl.NumberFormat.