Translate English date string to Chinese representation.

cn-date.user.js

// ==UserScript==
// @name        Translate Date
// @name:zh-CN  翻译日期到中文格式
// @namespace   translate-date.hyrious.me
// @match       *://*/*
// @exclude     *://*.bilibili.com/video/*
// @grant       none
// @version     1.0
// @author      hyrious
// @description May 25 -> 3月25日
// ==/UserScript==
(async function(){
  await new Promise(function (resolve) { setTimeout(resolve, 1000) })

  var d = new Date(), short = [], long = [];
  for (var i = 0; i < 12; i++) {
    d.setMonth(i)
    short.push(d.toLocaleDateString('en-US', { month: 'short' }))
    long.push(d.toLocaleDateString('en-US', { month: 'long' }))
  }

  var testRE = new RegExp('\\b(' + short.join('|') + '|' + long.join('|') + ') \\d')
  var w = document.createTreeWalker(
    document.body,
    NodeFilter.SHOW_TEXT,
    function filter(node) {
      if (testRE.test(node.data)) return NodeFilter.FILTER_ACCEPT
    }
  )
  var replaceRE = new RegExp('\\b(' + short.join('|') + '|' + long.join('|') + ') (\\d+)', 'g')
  while (w.nextNode()) {
    var node = w.currentNode
    node.data = node.data.replace(replaceRE, function (_, month, date) {
      var i = short.indexOf(month)
      if (i == -1) i = long.indexOf(month)
      if (i >= 0) {
        return (i + 1) + '月' + date + '日'
      }
      return _
    })
  }
})();